Johnston County, OK: No Building Permit, No Zoning

An ordinary single-family home in unincorporated Johnston County, Oklahoma does not need a State Fire Marshal building permit, although we could not confirm a separate county residential building-permit process¹. State Fire Marshal building permits and inspections cover applicable nonresidential occupancies where no local authority issues them, while Oklahoma DEQ handles septic permits throughout the county^2,3,4.

At a glance

Building permit: No State Fire Marshal permit for a rural house; a separate county residential process could not be confirmed¹
Zoning: No county zoning rules for unincorporated land; Tishomingo has its own zoning^5,6
Septic: State DEQ issues the septic Authorization to Construct and oversees inspections⁷
RV / tiny home / manufactured home: No county zoning restriction on unincorporated land⁵
Floodplain: County adopted its own floodplain ordinance in 2011; the county is not an NFIP participant⁸
Minimum lot size: No county zoning minimum; DEQ must approve residential-development plats before sale, construction or recording^5,9
Domestic well permit: Domestic use is exempt, including household use and garden, orchard or lawn irrigation of 3 acres or less¹⁰
Owner-builder exemption: No blanket permit exemption confirmed; limited state trade-license exemptions may apply^11,12,13

Who to call

Building permits

Oklahoma State Fire Marshal's Office

The statewide backstop building-plan review and permit for International Building Code use and occupancy classifications in areas, including unincorporated Johnston County, where no local building permit is required

(405) 522-5005

2501 North Lincoln Boulevard, Suite 219, Oklahoma City, OK 73105

Building permits

Oklahoma State Fire Marshal's Office

The statutory exemption that removes an ordinary house from the State Fire Marshal permit backstop in an unincorporated county

2 more officesSeptic permits · Floodplain permits

Septic permits

Oklahoma DEQ Environmental Complaints and Local Services Division

Septic (on-site sewage treatment) permits, the Report for On-Site Sewage, Authorization to Construct and inspections statewide, including Johnston County

405-702-0100

707 N Robinson, Oklahoma City, OK 73102

Online permits →

Floodplain permits

Johnston County Emergency Management

Hosts Johnston County's floodplain ordinances, resolution and the Floodplain Permit Application; also keeps paper flood maps at the same address

(580) 371-0174

110 N Fisher Street, Tishomingo, OK 73460

Contact details are copied from each office’s official page and were checked against it on October 14, 2026.

Do you need a building permit in Johnston County, Oklahoma?

A single-family dwelling, duplex, barn, shed or attached carport in unincorporated Johnston County does not require a State Fire Marshal building permit.

A single-family dwelling, duplex, barn, shed or attached carport in unincorporated Johnston County does not require a State Fire Marshal building permit¹. That permit is Oklahoma's backstop for other use and occupancy classifications where no local authority requires one². A county can take over building-permit jurisdiction only through an agreement with the State Fire Marshal, and we could not confirm that Johnston County has one, so ask the County Commissioners before you build¹⁴.

No permit does not mean no code. The Oklahoma Uniform Building Code Commission sets the minimum standards for residential and commercial construction statewide¹⁴. The 2018 International Residential Code was the statewide minimum for one- and two-family dwellings¹⁵, and the Commission adopted 2024 editions of the building, residential, plumbing, mechanical and fuel gas codes effective September 14, 2026¹⁶. In unincorporated areas the Construction Industries Board enforces the electrical, mechanical, plumbing and fuel-gas codes¹⁴.

Who issues building permits in Johnston County, and how do you reach them?

For a project covered by the state building-permit backstop, contact the Oklahoma State Fire Marshal's Office at 2501 North Lincoln Boulevard, Suite 219, Oklahoma City, OK 73105, or (405) 522-5005.

For a project covered by the state building-permit backstop, contact the Oklahoma State Fire Marshal's Office at 2501 North Lincoln Boulevard, Suite 219, Oklahoma City, OK 73105, or (405) 522-5005¹⁷. Every State Fire Marshal-permitted project requires state inspection; the project must pass final inspection before the agency completes its certificate-of-occupancy process³. Septic permits do not move to a city building office: Oklahoma DEQ administers the statewide program, and its Environmental Complaints and Local Services Division is at 707 N Robinson, Oklahoma City, OK 73102, (405) 702-0100^4,18. Johnston County Emergency Management handles the county floodplain permit application at 110 N Fisher Street, Tishomingo, OK 73460, (580) 371-0174⁸. Inside Tishomingo, the city's zoning ordinance governs land use, while DEQ remains the septic authority^4,6.

Does Johnston County have zoning?

Unincorporated Johnston County has no county zoning rules for minimum dwelling size, setbacks, lot coverage, building height, accessory dwellings, RVs, tiny homes or manufactured homes.

Unincorporated Johnston County has no county zoning rules for minimum dwelling size, setbacks, lot coverage, building height, accessory dwellings, RVs, tiny homes or manufactured homes⁵. That does not erase building codes, septic permits or subdivision review.

Outside a city or town, a residential-development plat must describe water supply and sewage treatment and receive DEQ approval before lots are sold, construction begins or the plat is recorded⁹. The county clerk may not record a plat with a lot smaller than 2.5 acres without DEQ's approval stamp⁵. Plats with publicly designated roads also go before the Board of County Commissioners⁵. Plats submitted for recording must also meet state format rules, including a 24 by 36 inch sheet at a scale of at least 100 feet to the inch¹⁹.

Inside Tishomingo, the city's zoning ordinance regulates land, buildings and structures, but Oklahoma DEQ still administers septic permits^4,6.

How do septic permits work in Johnston County?

Oklahoma DEQ, not Johnston County or a city building office, issues the septic Authorization to Construct for an individual or small public on-site sewage system.

Oklahoma DEQ, not Johnston County or a city building office, issues the septic Authorization to Construct for an individual or small public on-site sewage system^4,18. Before installing or modifying a system, submit the Report for On-Site Sewage for DEQ review and obtain the Authorization to Construct; the report determines allowable system types and dispersal requirements for the property^7,18.

Two details matter if you plan to install the system yourself. Since November 1, 2025, an installer not certified through DEQ may install only one on-site sewage system per calendar year¹⁸. Every new or modified system must be inspected and approved before it operates, either by DEQ or by a certified installer who self-inspects and submits the final inspection to DEQ within 15 days¹⁸. Applications submitted on or after July 1, 2026 fall under DEQ's increased fee schedule⁷.

About 23% of Johnston County soils have no severe limitation for a conventional drain field, so make the site evaluation an early contingency²⁰. A domestic groundwater-use permit is not required for household use and garden, orchard or lawn irrigation of 3 acres or less, but wells still must meet state construction standards¹⁰.

Can you live in an RV or tiny home on your land in Johnston County?

Outside city limits, Johnston County has no county zoning rule restricting RV, travel-trailer or tiny-home occupancy.

Outside city limits, Johnston County has no county zoning rule restricting RV, travel-trailer or tiny-home occupancy⁵. An off-grid home still needs a lawful sanitation plan: DEQ must approve the on-site sewage system and issue an Authorization to Construct before installation or modification⁷. An occupied manufactured home is a permanent installation under Oklahoma rules and must follow the applicable federal or manufacturer installation standards²¹. Development in the county's mapped floodplain goes through Johnston County's floodplain permit process, and Johnston County is not a participating member of the National Flood Insurance Program⁸. Inside Tishomingo, the city sets zoning, while DEQ continues to handle septic permits^4,6.

Building a home in Johnston County: the steps, in order

Confirm whether the parcel is inside a municipality; Tishomingo has city zoning, while unincorporated Johnston County does not.

Confirm whether the parcel is inside a municipality; Tishomingo has city zoning, while unincorporated Johnston County does not^5,6.
Ask the County Commissioners whether any county residential building permit or inspection applies; an ordinary single-family home outside city limits is exempt from the State Fire Marshal building permit¹.
If creating a residential development, obtain DEQ sewage-plat approval before selling lots, beginning construction or recording the plat; lots under 2.5 acres outside a city need DEQ's stamp to be recorded⁹.
Ask Johnston County Emergency Management whether the site needs the county floodplain permit⁸.
Obtain DEQ review and an Authorization to Construct before septic work begins; a non-certified owner may install only one system per calendar year¹⁸.
Obtain an ODOT driveway permit before work in a state highway right-of-way; ask the County Commissioners about county-road access²².
Schedule every required inspection; State Fire Marshal-permitted projects and new or modified septic systems must be inspected^3,18.

What to check before you buy land in Johnston County

About 23% of Johnston County soils have no severe limitation for a conventional septic drain field, so a site evaluation can materially affect the buildable area and system budget.

About 23% of Johnston County soils have no severe limitation for a conventional septic drain field, so a site evaluation can materially affect the buildable area and system budget²⁰. Check with Emergency Management about mapped floodplain status because Johnston County has floodplain ordinances and does not participate in the National Flood Insurance Program⁸. The county receives about 43 inches of rain annually but spends roughly 20% of years in severe drought, so verify the well or rural-water plan early²⁰. Domestic groundwater use is permit-exempt within the stated limits, while non-domestic use requires a permit¹⁰. Qualifying farmers and ranchers may obtain an Oklahoma agricultural exemption permit card for eligible farm or ranch purchases²³. Johnston County's effective property-tax rate is about 0.6%, with a median annual bill near $614²⁰.

Watch-outs

A Johnston County residential building permit, inspection or certificate-of-occupancy process could not be confirmed; the State Fire Marshal's inspection and certificate process applies only to projects within its jurisdiction³.
No blanket owner-builder exemption from applicable permits or inspections was confirmed; state rules instead provide limited license or registration exemptions for specified owner-performed trades^11,12,13.

Sources

23 official pages, each quoted and re-checked · written October 14, 2026

Written October 14, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Off-grid gear

Going off-grid in Johnston County means bringing your own water and power. The kit we’d start with:

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Compared with neighboring counties

Like all 6 of its neighbors, Johnston County has no countywide zoning.

Rule	Johnston County	Marshall County	Murray County	Coal County	Bryan County	Pontotoc County	Carter County
Building permit	Not required	Not required	Limited	Not required	Not required	Not required	Not required
County zoning	No	No	No	No	No	No	No
Septic permits	OK DEQ	OK DEQ	OK DEQ	OK DEQ	OK DEQ	OK DEQ	OK DEQ

Cities and towns in Johnston County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Town of Bromide · Town of Mannsville · Town of Milburn · Town of Mill Creek · Town of Ravia · Tishomingo · Town of Wapanucka

Answers from the rulebook for Johnston County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Johnston County rules

Zoning districts · by state lawNo county rule
Unincorporated Johnston County: no county rule sets this, because Johnston County has adopted no county zoning ordinance (Oklahoma law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing growwithjoco.com.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- The act applies only to counties having a population in excess of 500,000 according to the latest Federal Decennial Census.
- The zoning power is limited to unincorporated areas of the county.
“The board of county commissioners is hereby empowered to adopt zoning regulations effective in the unincorporated areas of the county for the purposes of promoting the health, safety, peace, morals, comfort and the general welfare of the inhabitants; lessening danger and congestion in public transportation and travel; securing safety from fire and other dangers; preventing overcrowding of land; avoiding undue concentration of population; providing adequate police protection, transportation, water, sewerage, schools, parks, forests, recreational facilities, airports, military and naval facilities, and other public requirements; and preventing undue encroachment thereon. The zoning power hereby conferred shall not be exercised so as to deprive the owner of any existing property of its use or maintenance for the purpose to which it is then lawfully devoted except as hereinafter provided; nor shall the provisions of this act apply to the erection, installation and use of structures and equipment by public utilities subject to the jurisdiction and regulation of the Corporation Commission of the State of Oklahoma or other similar state or federal regulatory bodies; nor to the erection or use of the usual farm buildings for agricultural purposes, the planting of agricultural crops or the extraction of minerals.”
Oklahoma Statutes - Title 19. Counties and County Officers ↗Re-checked Sep 21, 2026
Minimum dwelling size · by state lawNo county rule
Unincorporated Johnston County: no county rule sets this, because Johnston County has adopted no county zoning ordinance (Oklahoma law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing growwithjoco.com.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- The act applies only to counties having a population in excess of 500,000 according to the latest Federal Decennial Census.
- The zoning power is limited to unincorporated areas of the county.
“The board of county commissioners is hereby empowered to adopt zoning regulations effective in the unincorporated areas of the county for the purposes of promoting the health, safety, peace, morals, comfort and the general welfare of the inhabitants; lessening danger and congestion in public transportation and travel; securing safety from fire and other dangers; preventing overcrowding of land; avoiding undue concentration of population; providing adequate police protection, transportation, water, sewerage, schools, parks, forests, recreational facilities, airports, military and naval facilities, and other public requirements; and preventing undue encroachment thereon. The zoning power hereby conferred shall not be exercised so as to deprive the owner of any existing property of its use or maintenance for the purpose to which it is then lawfully devoted except as hereinafter provided; nor shall the provisions of this act apply to the erection, installation and use of structures and equipment by public utilities subject to the jurisdiction and regulation of the Corporation Commission of the State of Oklahoma or other similar state or federal regulatory bodies; nor to the erection or use of the usual farm buildings for agricultural purposes, the planting of agricultural crops or the extraction of minerals.”
Oklahoma Statutes - Title 19. Counties and County Officers ↗Re-checked Sep 21, 2026
Minimum lot size · by state lawNo county rule
Unincorporated Johnston County: no county rule sets this, because Johnston County has adopted no county zoning ordinance (Oklahoma law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing growwithjoco.com.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- The act applies only to counties having a population in excess of 500,000 according to the latest Federal Decennial Census.
- The zoning power is limited to unincorporated areas of the county.
“The board of county commissioners is hereby empowered to adopt zoning regulations effective in the unincorporated areas of the county for the purposes of promoting the health, safety, peace, morals, comfort and the general welfare of the inhabitants; lessening danger and congestion in public transportation and travel; securing safety from fire and other dangers; preventing overcrowding of land; avoiding undue concentration of population; providing adequate police protection, transportation, water, sewerage, schools, parks, forests, recreational facilities, airports, military and naval facilities, and other public requirements; and preventing undue encroachment thereon. The zoning power hereby conferred shall not be exercised so as to deprive the owner of any existing property of its use or maintenance for the purpose to which it is then lawfully devoted except as hereinafter provided; nor shall the provisions of this act apply to the erection, installation and use of structures and equipment by public utilities subject to the jurisdiction and regulation of the Corporation Commission of the State of Oklahoma or other similar state or federal regulatory bodies; nor to the erection or use of the usual farm buildings for agricultural purposes, the planting of agricultural crops or the extraction of minerals.”
Oklahoma Statutes - Title 19. Counties and County Officers ↗Re-checked Sep 21, 2026
Setbacks · by state lawNo county rule
Unincorporated Johnston County: no county rule sets this, because Johnston County has adopted no county zoning ordinance (Oklahoma law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing growwithjoco.com.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- The act applies only to counties having a population in excess of 500,000 according to the latest Federal Decennial Census.
- The zoning power is limited to unincorporated areas of the county.
“The board of county commissioners is hereby empowered to adopt zoning regulations effective in the unincorporated areas of the county for the purposes of promoting the health, safety, peace, morals, comfort and the general welfare of the inhabitants; lessening danger and congestion in public transportation and travel; securing safety from fire and other dangers; preventing overcrowding of land; avoiding undue concentration of population; providing adequate police protection, transportation, water, sewerage, schools, parks, forests, recreational facilities, airports, military and naval facilities, and other public requirements; and preventing undue encroachment thereon. The zoning power hereby conferred shall not be exercised so as to deprive the owner of any existing property of its use or maintenance for the purpose to which it is then lawfully devoted except as hereinafter provided; nor shall the provisions of this act apply to the erection, installation and use of structures and equipment by public utilities subject to the jurisdiction and regulation of the Corporation Commission of the State of Oklahoma or other similar state or federal regulatory bodies; nor to the erection or use of the usual farm buildings for agricultural purposes, the planting of agricultural crops or the extraction of minerals.”
Oklahoma Statutes - Title 19. Counties and County Officers ↗Re-checked Sep 21, 2026
Lot coverage · by state lawNo county rule
Unincorporated Johnston County: no county rule sets this, because Johnston County has adopted no county zoning ordinance (Oklahoma law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing growwithjoco.com.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- The act applies only to counties having a population in excess of 500,000 according to the latest Federal Decennial Census.
- The zoning power is limited to unincorporated areas of the county.
“The board of county commissioners is hereby empowered to adopt zoning regulations effective in the unincorporated areas of the county for the purposes of promoting the health, safety, peace, morals, comfort and the general welfare of the inhabitants; lessening danger and congestion in public transportation and travel; securing safety from fire and other dangers; preventing overcrowding of land; avoiding undue concentration of population; providing adequate police protection, transportation, water, sewerage, schools, parks, forests, recreational facilities, airports, military and naval facilities, and other public requirements; and preventing undue encroachment thereon. The zoning power hereby conferred shall not be exercised so as to deprive the owner of any existing property of its use or maintenance for the purpose to which it is then lawfully devoted except as hereinafter provided; nor shall the provisions of this act apply to the erection, installation and use of structures and equipment by public utilities subject to the jurisdiction and regulation of the Corporation Commission of the State of Oklahoma or other similar state or federal regulatory bodies; nor to the erection or use of the usual farm buildings for agricultural purposes, the planting of agricultural crops or the extraction of minerals.”
Oklahoma Statutes - Title 19. Counties and County Officers ↗Re-checked Sep 21, 2026
Building height · by state lawNo county rule
Unincorporated Johnston County: no county rule sets this, because Johnston County has adopted no county zoning ordinance (Oklahoma law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing growwithjoco.com.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- The act applies only to counties having a population in excess of 500,000 according to the latest Federal Decennial Census.
- The zoning power is limited to unincorporated areas of the county.
“The board of county commissioners is hereby empowered to adopt zoning regulations effective in the unincorporated areas of the county for the purposes of promoting the health, safety, peace, morals, comfort and the general welfare of the inhabitants; lessening danger and congestion in public transportation and travel; securing safety from fire and other dangers; preventing overcrowding of land; avoiding undue concentration of population; providing adequate police protection, transportation, water, sewerage, schools, parks, forests, recreational facilities, airports, military and naval facilities, and other public requirements; and preventing undue encroachment thereon. The zoning power hereby conferred shall not be exercised so as to deprive the owner of any existing property of its use or maintenance for the purpose to which it is then lawfully devoted except as hereinafter provided; nor shall the provisions of this act apply to the erection, installation and use of structures and equipment by public utilities subject to the jurisdiction and regulation of the Corporation Commission of the State of Oklahoma or other similar state or federal regulatory bodies; nor to the erection or use of the usual farm buildings for agricultural purposes, the planting of agricultural crops or the extraction of minerals.”
Oklahoma Statutes - Title 19. Counties and County Officers ↗Re-checked Sep 21, 2026
Living in an RV · by state lawNo county rule
Unincorporated Johnston County: no county rule sets this, because Johnston County has adopted no county zoning ordinance (Oklahoma law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing growwithjoco.com.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- The act applies only to counties having a population in excess of 500,000 according to the latest Federal Decennial Census.
- The zoning power is limited to unincorporated areas of the county.
“The board of county commissioners is hereby empowered to adopt zoning regulations effective in the unincorporated areas of the county for the purposes of promoting the health, safety, peace, morals, comfort and the general welfare of the inhabitants; lessening danger and congestion in public transportation and travel; securing safety from fire and other dangers; preventing overcrowding of land; avoiding undue concentration of population; providing adequate police protection, transportation, water, sewerage, schools, parks, forests, recreational facilities, airports, military and naval facilities, and other public requirements; and preventing undue encroachment thereon. The zoning power hereby conferred shall not be exercised so as to deprive the owner of any existing property of its use or maintenance for the purpose to which it is then lawfully devoted except as hereinafter provided; nor shall the provisions of this act apply to the erection, installation and use of structures and equipment by public utilities subject to the jurisdiction and regulation of the Corporation Commission of the State of Oklahoma or other similar state or federal regulatory bodies; nor to the erection or use of the usual farm buildings for agricultural purposes, the planting of agricultural crops or the extraction of minerals.”
Oklahoma Statutes - Title 19. Counties and County Officers ↗Re-checked Sep 21, 2026
Camping on your land · by state lawNo county rule
Unincorporated Johnston County: no county rule sets this, because Johnston County has adopted no county zoning ordinance (Oklahoma law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing growwithjoco.com.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- The act applies only to counties having a population in excess of 500,000 according to the latest Federal Decennial Census.
- The zoning power is limited to unincorporated areas of the county.
“The board of county commissioners is hereby empowered to adopt zoning regulations effective in the unincorporated areas of the county for the purposes of promoting the health, safety, peace, morals, comfort and the general welfare of the inhabitants; lessening danger and congestion in public transportation and travel; securing safety from fire and other dangers; preventing overcrowding of land; avoiding undue concentration of population; providing adequate police protection, transportation, water, sewerage, schools, parks, forests, recreational facilities, airports, military and naval facilities, and other public requirements; and preventing undue encroachment thereon. The zoning power hereby conferred shall not be exercised so as to deprive the owner of any existing property of its use or maintenance for the purpose to which it is then lawfully devoted except as hereinafter provided; nor shall the provisions of this act apply to the erection, installation and use of structures and equipment by public utilities subject to the jurisdiction and regulation of the Corporation Commission of the State of Oklahoma or other similar state or federal regulatory bodies; nor to the erection or use of the usual farm buildings for agricultural purposes, the planting of agricultural crops or the extraction of minerals.”
Oklahoma Statutes - Title 19. Counties and County Officers ↗Re-checked Sep 21, 2026
Tiny homes · by state lawNo county rule
Unincorporated Johnston County: no county rule sets this, because Johnston County has adopted no county zoning ordinance (Oklahoma law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing growwithjoco.com.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- The act applies only to counties having a population in excess of 500,000 according to the latest Federal Decennial Census.
- The zoning power is limited to unincorporated areas of the county.
“The board of county commissioners is hereby empowered to adopt zoning regulations effective in the unincorporated areas of the county for the purposes of promoting the health, safety, peace, morals, comfort and the general welfare of the inhabitants; lessening danger and congestion in public transportation and travel; securing safety from fire and other dangers; preventing overcrowding of land; avoiding undue concentration of population; providing adequate police protection, transportation, water, sewerage, schools, parks, forests, recreational facilities, airports, military and naval facilities, and other public requirements; and preventing undue encroachment thereon. The zoning power hereby conferred shall not be exercised so as to deprive the owner of any existing property of its use or maintenance for the purpose to which it is then lawfully devoted except as hereinafter provided; nor shall the provisions of this act apply to the erection, installation and use of structures and equipment by public utilities subject to the jurisdiction and regulation of the Corporation Commission of the State of Oklahoma or other similar state or federal regulatory bodies; nor to the erection or use of the usual farm buildings for agricultural purposes, the planting of agricultural crops or the extraction of minerals.”
Oklahoma Statutes - Title 19. Counties and County Officers ↗Re-checked Sep 21, 2026
Manufactured homes · by state lawNo county rule
Unincorporated Johnston County: no county rule sets this, because Johnston County has adopted no county zoning ordinance (Oklahoma law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing growwithjoco.com.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- The act applies only to counties having a population in excess of 500,000 according to the latest Federal Decennial Census.
- The zoning power is limited to unincorporated areas of the county.
“The board of county commissioners is hereby empowered to adopt zoning regulations effective in the unincorporated areas of the county for the purposes of promoting the health, safety, peace, morals, comfort and the general welfare of the inhabitants; lessening danger and congestion in public transportation and travel; securing safety from fire and other dangers; preventing overcrowding of land; avoiding undue concentration of population; providing adequate police protection, transportation, water, sewerage, schools, parks, forests, recreational facilities, airports, military and naval facilities, and other public requirements; and preventing undue encroachment thereon. The zoning power hereby conferred shall not be exercised so as to deprive the owner of any existing property of its use or maintenance for the purpose to which it is then lawfully devoted except as hereinafter provided; nor shall the provisions of this act apply to the erection, installation and use of structures and equipment by public utilities subject to the jurisdiction and regulation of the Corporation Commission of the State of Oklahoma or other similar state or federal regulatory bodies; nor to the erection or use of the usual farm buildings for agricultural purposes, the planting of agricultural crops or the extraction of minerals.”
Oklahoma Statutes - Title 19. Counties and County Officers ↗Re-checked Sep 21, 2026
Accessory dwellings · by state lawNo county rule
Unincorporated Johnston County: no county rule sets this, because Johnston County has adopted no county zoning ordinance (Oklahoma law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing growwithjoco.com.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- The act applies only to counties having a population in excess of 500,000 according to the latest Federal Decennial Census.
- The zoning power is limited to unincorporated areas of the county.
“The board of county commissioners is hereby empowered to adopt zoning regulations effective in the unincorporated areas of the county for the purposes of promoting the health, safety, peace, morals, comfort and the general welfare of the inhabitants; lessening danger and congestion in public transportation and travel; securing safety from fire and other dangers; preventing overcrowding of land; avoiding undue concentration of population; providing adequate police protection, transportation, water, sewerage, schools, parks, forests, recreational facilities, airports, military and naval facilities, and other public requirements; and preventing undue encroachment thereon. The zoning power hereby conferred shall not be exercised so as to deprive the owner of any existing property of its use or maintenance for the purpose to which it is then lawfully devoted except as hereinafter provided; nor shall the provisions of this act apply to the erection, installation and use of structures and equipment by public utilities subject to the jurisdiction and regulation of the Corporation Commission of the State of Oklahoma or other similar state or federal regulatory bodies; nor to the erection or use of the usual farm buildings for agricultural purposes, the planting of agricultural crops or the extraction of minerals.”
Oklahoma Statutes - Title 19. Counties and County Officers ↗Re-checked Sep 21, 2026
Building in a floodplainLimited
Development located in Johnston County floodplain areas.
- The identified regulation is limited to floodplain areas.
- Johnston County formally adopted floodplain ordinances on July 25, 2011.
- Johnston County is not a participating member of the National Flood Insurance Program (NFIP).
- The county page identifies a Floodplain Permit Application, but the page does not state the complete permit standards or exemptions.
floodplain ordinance adoption date: 2011-07-25
“Johnston County is not a participating member of the National Flood Insurance Program (NFIP). Formal adoption of Floodplain Ordinances was accomplished on July 25, 2011, by the Johnston County Board of County Commissioners. The Ordinances and Resolution can be found in the right hand column of this page. Other documents in the list are the Floodplain Permit Application..”
johnston.okcounties.org ↗Re-checked Sep 11, 2026
Permit processPublished (with conditions)
Floodplain development permitting in Johnston County, Oklahoma.
- Johnston County formally adopted floodplain ordinances on July 25, 2011.
- The county page identifies a Floodplain Permit Application among the related documents.
- Johnston County is not a participating member of the National Flood Insurance Program (NFIP).
floodplain ordinance adoption date: 2011-07-25
“Johnston County is not a participating member of the National Flood Insurance Program (NFIP). Formal adoption of Floodplain Ordinances was accomplished on July 25, 2011, by the Johnston County Board of County Commissioners. The Ordinances and Resolution can be found in the right hand column of this page. Other documents in the list are the Floodplain Permit Application..”
johnston.okcounties.org ↗Re-checked Sep 11, 2026
County-wide zoningAbsent
Johnston County lacks a dedicated planning or zoning department; unincorporated land is not governed by a county zoning ordinance, with land-use control only inside incorporated municipalities.
Johnston County Economic Development - Obtaining a Permit ↗From the county’s own site, awaiting a second reviewer

Oklahoma rules that apply here

Building permitLimited
State Fire Marshal permitting for construction or alteration of a single-family dwelling, duplex residential dwelling, barn, or shed, or a carport attached to a single-family or duplex residential dwelling, when located in an unincorporated area of an Oklahoma county.
- Oklahoma law does not require a State Fire Marshal permit for the listed structures in an unincorporated county area.
- The exemption is limited to the State Fire Marshal permit requirement and does not prohibit a city, town, or county from requiring local plans, specifications, or permits under applicable local authority.
- Other applicable state or local requirements may still apply.
“Furthermore, nothing in this subsection shall be construed as requiring a person to obtain a permit from the State Fire Marshal for the construction or alteration of a single-family dwelling, duplex residential dwelling, barn, shed, or carport attached to a single-family dwelling, or duplex residential dwelling when such structure is located in an unincorporated area of a county.”
Oklahoma Statutes - Title 74, § 74-324.11 ↗Re-checked Oct 1, 2026
One more reviewed finding on this topic
- Limited — Projects in Oklahoma geographic areas where no building permit is required by local authorities, for all Use and Occupancy Classifications identified in the International Building Code.
  “In all geographical areas wherein no building permit is required by local authorities such permit shall be obtained from the State Fire Marshal's Office for all Use and Occupancy Classifications identified in the International Building Code®.”
  oklahoma.gov ↗Re-checked Sep 11, 2026
Owner-builder exemptionConditional
Owners, certain lessees, and family or employees performing roofing work on qualifying residential, farm, commercial, or single-family dwelling property in Oklahoma.
- An actual owner of residential or farm property may physically perform roofing services or have family or employees perform them on property owned by the person.
- Owners of commercial properties, including residential rental properties consisting of four dwelling units or less, must act as their own roofing contractor, provide all material supervision themselves, and install roofing materials according to the IBC as adopted by the OUBCC or the manufacturer's installation instructions.
- A lessee of residential property must have the owner's consent and must perform the roofing work personally or with the lessee's own employees, using materials installed according to the IBC as adopted by the OUBCC or the manufacturer's installation instructions.
- An owner building or improving a single-family dwelling residence for the owner's occupancy and not intended for sale or rent must act as the owner's own roofing contractor, provide all material supervision, and install materials according to the IRC or IBC as adopted by the OUBCC or the manufacturer's installation instructions.
- A person working on the person's own property or that of an immediate relative without compensation is listed as exempt.
- Non-exempt roofing contractors must register annually with the CIB; the source states that the application requires the required fee and documentation but does not state an amount.
- This source concerns state roofing registration and does not establish that local building permits or inspections are waived.
residential rental property size: <= 4 dwelling units (The exemption is stated for residential rental properties consisting of four dwelling units or less.)
“An actual owner of residential or farm property who physically performs, or has family or employees perform roofing services on property owned by such person;”
Notice of Required Registration & Endorsement — Roofing Contractor Registration Act ↗Re-checked Oct 4, 2026
4 more reviewed findings on this topic
- Available (with conditions) — An individual performing electrical work on the individual's own property or residence in Oklahoma.
  “3. An individual to hold a license before doing electrical work on his own property or residence except as may be required by local ordinances and resolutions.”
  Oklahoma Statutes — Title 59, Professions and Occupations ↗Re-checked Oct 4, 2026
- Conditional — A property owner of record or authorized representative performing minor mechanical repairs in Oklahoma.
  “1. A person who is the property owner of record, or his or her authorized representative, when performing minor repair which shall include, but not be limited to, cleaning, adjusting, calibrating and repair of mechanical system parts and the replacement of fuses and room thermostats, and other minor repairs which shall not include any repair which could violate the safe operation of the equipment;”
  Oklahoma Statutes — Title 59, Professions and Occupations ↗Re-checked Oct 4, 2026
- Conditional — An individual performing electrical work on the individual's own property or residence under the Oklahoma Electrical License Act.
  “hold a license before doing electrical work on his own property or residence except as may be required by local ordinances and resolutions.”
  Title 59 Electrical License Act ↗Re-checked Oct 4, 2026
- Available (with conditions) — An individual performing plumbing work on the individual's property of residence in Oklahoma.
  “The provisions of The Plumbing License Law of 1955 shall not apply to: [...] 6. An individual who performs plumbing work on such individual’s property of residence.”
  Oklahoma Statutes — Title 59, Professions and Occupations ↗Re-checked Oct 4, 2026
Building code adoptedAdopted
Commercial building construction throughout Oklahoma, subject to the OUBCC amendments and lawful requirements of other jurisdictions.
- The adopted code is the 2024 International Building Code as amended and modified by OUBCC rules.
- The 2024 IBC became effective September 14, 2026.
- The statewide code is a minimum standard; other jurisdictions may amend or alter it only pursuant to Oklahoma law and OUBCC administrative rules.
- The International Building Code 2021 Edition was expressly not adopted for any purpose.
- None of the IBC 2024 appendices are included in the statewide minimum code; other jurisdictions may adopt appendices under 59 O.S. § 1000.29.
- All IBC 2024 chapters and provisions, including exceptions, not specifically modified, deleted, moved, or removed by the rules are adopted without modification.
- Chapter 34 is not adopted and is not part of the statewide minimum code.
code edition: International Building Code 2024 (as amended and modified by OUBCC) · effective date: 2026-09-14
“748:20-2-1., 748:20-2-2., 748:20-2-3., and 748:20-2-4., adopt the IBC® 2024 edition, without appendices and establishes the IBC® 2024 edition as the statewide minimum code for commercial construction in the State of Oklahoma.”
2026 748 Chapter 20, Adopted Codes — International Building Code, 2024 Edition ↗Re-checked Oct 1, 2026
6 more reviewed findings on this topic
- Adopted (with conditions) — One- and two-family dwellings and townhouses in Johnston County and elsewhere in Oklahoma, subject to lawful local code-administration and enforcement jurisdiction.
  “The IRC® 2018, as amended and revised by these rules, is hereby established and adopted as the statewide minimum code for residential building construction for one- and two-family dwellings and townhouses in Oklahoma pursuant to 59 O.S. § 1000.23 and may only be amended or altered by other jurisdictions pursuant to Oklahoma law.”
  Oklahoma Uniform Building Code Commission - 2018 IRC ↗Re-checked Sep 11, 2026
- Adopted (with conditions) — The 2024 editions of the International Building Code, International Fuel Gas Code, International Mechanical Code, International Plumbing Code, and International Residential Code, with amendments, in Oklahoma including Johnston County.
  “The Oklahoma Uniform Building Code Commission (OUBCC) has adopted the 2024 editions of the International Building Code, International Fuel Gas Code, International Mechanical Code, International Plumbing Code and International Residential Code, with amendments effective September 14, 2026.”
  2026 Building Code Updates and Examination Transition Period ↗Re-checked Sep 11, 2026
- Adopted (with conditions) — Minimum building codes affecting the built environment throughout Oklahoma, including Johnston County, subject to the applicable authority having jurisdiction.
  “The Oklahoma Uniform Building Code Commission shall have the power and the duty to review and adopt all building codes for residential and commercial construction to be used by all entities within this state. Codes and standards adopted by the Commission shall be the minimum standards for residential and commercial construction in this state.”
  Oklahoma Uniform Building Code Commission ↗Re-checked Oct 5, 2026
- Adopted (with conditions) — Construction and building-code enforcement in Johnston County, subject to the applicable state or local authority having jurisdiction.
  “No jurisdiction shall adopt any ordinances with standards less stringent than the building code as last adopted by the Oklahoma Uniform Building Code Commission (OUBCC).”
  Authority Having Jurisdiction ↗Re-checked Oct 6, 2026
- Adopted — Minimum building-code standards for residential and commercial construction throughout Oklahoma, including construction subject to local county or municipal enforcement.
  “Base model codes have been adopted by reference and amended at the state level.”
  Oklahoma Statutes, Title 59 — Professions and Occupations ↗Re-checked Oct 1, 2026
- Adopted — Minimum building codes for residential and commercial construction throughout Oklahoma, including construction in unincorporated areas.
  “Codes and standards adopted by the Commission shall be the minimum standards for residential and commercial construction in this state.”
  Adopted Building Codes ↗Re-checked Oct 5, 2026
InspectionsLimited
Projects permitted and inspected by the Oklahoma State Fire Marshal; this includes International Building Code use and occupancy classifications in geographic areas where local authorities do not require a building permit.
- The project must be permitted.
- Inspections test compliance with the permit and applicable codes.
- Inspection requests must allow at least 7 days of advance notice.
- All required permits must be issued and on site before a 50% inspection.
- All permits and addendums, if applicable, must be issued before the 100% inspection.
- Where a jurisdiction has a current agreement authorizing it to conduct plan reviews and inspections, the State Fire Marshal states that an additional state permit is not needed.
inspection request advance notice: >= 7 days · re-inspection fee after failed 100% final inspection: 100 USD per inspection site visit
“All permitted projects are required to be inspected for compliance with the permit and the applicable codes.”
Inspections ↗Re-checked Nov 4, 2026
One more reviewed finding on this topic
- Required — All projects permitted by the Oklahoma State Fire Marshal, including projects for which the State Fire Marshal is the applicable authority having jurisdiction.
  “All permitted projects are required to be inspected for compliance with the permit and the applicable codes.”
  Inspections ↗Re-checked Sep 11, 2026
Certificate of occupancyLimited
Certificates of Occupancy issued by the Oklahoma State Fire Marshal for projects within its permitting and inspection process.
- A completed Certificate of Completion – Final Statement of Compliance Form must be on site at final inspection; otherwise the final inspection fails.
- For projects designed and sealed by a registered design professional, the architect or engineer is responsible for completing the form and obtaining required signatures.
- For projects not designed or sealed by a registered design professional, the owner is responsible for completing the form and obtaining required signatures.
- Occupancy or use before furnishing the form when required is expressly forbidden unless and until a satisfactory inspection has been made by the State Fire Marshal or certified representative.
- The State Fire Marshal's process does not establish that every project statewide needs a state-issued certificate; local authorities may administer plan reviews and inspections under current authority-having-jurisdiction agreements.
“A final inspection report and or a Certificate of Occupancy will not be issued without this form being completed in its entirety. If this form is not on-site at the final inspection, the inspection will be FAILED.”
Instructions and Procedures for Final Inspections ↗Re-checked Nov 4, 2026
One more reviewed finding on this topic
- Limited — Projects in Johnston County within the Oklahoma State Fire Marshal's jurisdiction that fall under International Building Code use and occupancy classifications or specific International Fire Code situations, including projects in areas where no local building permit is required.
  “All permitted projects are required to be inspected for compliance with the permit and the applicable codes. [...] Once the project has passed the final inspection by an OKSFM Agent, the Agent will recommend a Certificate of Occupancy be granted. The Certificate of Occupancy will be emailed by the OKSFM office to the point of contact listed for the project or inspection.”
  oklahoma.gov ↗Re-checked Oct 5, 2026
Who permits septicState
Individual and small public on-site sewage treatment systems, including systems in Johnston County.
- The Oklahoma Department of Environmental Quality administers the statewide on-site sewage treatment program through its Environmental Complaints and Local Services Division.
- Local DEQ environmental specialists handle location-based review and issuance; the cited source does not assign authority to Johnston County.
“ECLS administers Oklahoma’s on-site sewage treatment program.”
Environmental Complaints & Local Services ↗Re-checked Sep 11, 2026
One more reviewed finding on this topic
- State — Statewide administration and regulatory oversight of individual and small public on-site sewage treatment systems in Oklahoma.
  “ECLS administers Oklahoma’s on-site sewage treatment program.”
  Environmental Complaints & Local Services ↗Re-checked Sep 12, 2026
Septic permitRequired
Installing a new or modifying an existing on-site sewage treatment system in Johnston County.
- Before installation of a new system or modification of an existing system, an Authorization to Construct must be purchased and issued by DEQ.
- The Report for On-Site Sewage must be reviewed by DEQ before the ATC may be issued.
- Alternative systems must be approved by DEQ before installation.
- Effective November 1, 2025, individuals not certified through DEQ may install only one on-site sewage treatment system per calendar year.
non-certified installer annual installation limit: 1 system per calendar year (Effective November 1, 2025)
“Before installing a new or modifying an existing on-site sewage treatment system, an Authorization to Construct (ATC) must be purchased and issued by DEQ.”
On-Site Sewage Information ↗Re-checked Sep 11, 2026
One more reviewed finding on this topic
- Required — Installing a new or modifying an existing individual or small public on-site sewage treatment system statewide.
  “Before installing a new or modifying an existing on-site sewage treatment system, an Authorization to Construct (ATC) must be purchased and issued by DEQ. After the ATC is purchased, it is assigned to the local DEQ Environmental Specialist (ES), based on the location of the property, for review and issuance. The Report for On-Site Sewage (581) must be reviewed by DEQ before the ATC may be issued.”
  On-Site Sewage Treatment ↗Re-checked Sep 12, 2026
Septic inspectionRequired
All new installations and modifications of on-site sewage systems in Johnston County.
- Inspection and approval must occur before the system may be placed into operation.
- DEQ may inspect and approve, or a certified installer may install, self-inspect, and obtain approval.
- Final inspections performed by a certified installer must be submitted to DEQ within 15 days of completion.
certified-installer final inspection submission deadline: 15 days after completion
“All new installations or modifications to an on-site sewage system must be inspected and approved by DEQ”
On-Site Sewage Information ↗Re-checked Sep 11, 2026
2 more reviewed findings on this topic
- Required — Construction or operation of a small public sewage treatment system or individual sewage treatment system in Oklahoma.
  “No small public sewage treatment system or individual sewage treatment system shall be constructed or operated unless such system, when constructed, complies with requirements prescribed by the Environmental Quality Board as determined by an inspection performed by the Department of Environmental Quality or a person authorized by the Department.”
  Oklahoma Statutes, Title 27A—Environment and Natural Resources ↗Re-checked Nov 4, 2026
- Not required — An existing individual sewage disposal system before a service connection to a public water supply system in Oklahoma.
  “The Department of Environmental Quality shall not require a departmental inspection of an existing individual sewage disposal system prior to a service connection to a public water supply system.”
  Oklahoma Statutes, Title 27A—Environment and Natural Resources ↗Re-checked Nov 4, 2026
Off-grid sanitationLimited
Off-grid sanitation using individual or small public on-site sewage treatment systems serving property in Johnston County, Oklahoma, where the system is governed by Oklahoma's statewide DEQ program.
- A DEQ Authorization to Construct must be purchased and issued before installing a new system or modifying an existing system.
- The Report for On-Site Sewage (581) must be reviewed by DEQ before the Authorization to Construct may be issued.
- All new installations or modifications must be inspected and approved by DEQ, or installed, self-inspected, and approved by a certified installer, before the system may be placed into operation.
- Allowable system types and minimum dispersal requirements are determined for the property through the Report for On-Site Sewage and depend on property and system factors, including residence size or daily flow.
- Alternative on-site systems require DEQ approval before installation.
- Beginning November 1, 2025, individuals not certified through DEQ may install only one on-site sewage system per calendar year.
- Applications submitted on or after July 1, 2026 are subject to the increased fee schedule described by DEQ's annual Consumer Price Index adjustment notice.
non-certified installer annual installation limit: 1 system per calendar year (Applies beginning November 1, 2025.) · fee schedule change: 2026-07-01 (Applications submitted on or after this date are subject to the new fee schedule.)
“Before installing a new or modifying an existing on-site sewage treatment system, an Authorization to Construct (ATC) must be purchased and issued by DEQ.”
On-Site Sewage Treatment ↗Re-checked Oct 6, 2026
One more reviewed finding on this topic
- Allowed (with conditions) — On-site sewage treatment systems used by Oklahoma homes and businesses where sewage is treated on the property rather than through a centralized sewer system.
  “determines what types of on-site systems are allowed for the property.”
  On-Site Sewage Information ↗Re-checked Oct 5, 2026
Well permitRequired
Groundwater wells drilled or used for non-domestic purposes in Oklahoma, including public water supply, industrial, commercial, oil and gas, poultry, medical-marijuana, and irrigation of more than 3 acres.
- A well drilling contractor must obtain OWRB authorization and approval before drilling.
- Authorization will not be issued unless the well location has an active groundwater use permit.
- Groundwater permit applications must be filed before taking or using groundwater and before drilling.
- The applicant must own or lease the land, the land must overlie a fresh groundwater basin or subbasin, the proposed use must be beneficial, and waste by depletion or pollution must not occur.
- Failure to submit an intent-to-drill application when required may result in a penalty of up to $5,000 per day per violation.
irrigation threshold for intent-to-drill authorization: > 3 acres (Irrigation of less than 3 acres is listed as not requiring intent-to-drill authorization.) · application response time: 5 business days approximately (OWRB staff response time stated on the Wells & Licensing page.) · maximum penalty for failure to submit required intent-to-drill application: <= 5000 USD per day per violation
“Any well drilling contractor who intends to drill a groundwater well for non-domestic use must apply for authorization”
Wells & Licensing ↗Re-checked Oct 5, 2026
3 more reviewed findings on this topic
- Limited — Groundwater wells serving domestic uses in Johnston County, including household use, farm and domestic animals at normal grazing capacity, garden/orchard/lawn irrigation of 3 acres or less, and non-household uses of 5 acre-feet or less annually.
  “Use of water for domestic purposes [...] is exempt from the permit requirement.”
  Water Use Laws & Procedures ↗Re-checked Sep 11, 2026
- Not required — Domestic use of groundwater and domestic groundwater wells used for household purposes, qualifying livestock, or irrigation of less than three acres statewide.
  “A water permit is not required for domestic use of groundwater”
  Apply for a Water Permit ↗Re-checked Sep 12, 2026
- Not required — Domestic groundwater use in Oklahoma, including household purposes, livestock up to the land’s grazing capacity, and irrigation of less than 3 acres.
  “A water permit is not required for domestic use of groundwater”
  Apply for a Water Permit ↗Re-checked Oct 5, 2026
Mandatory utility hookupWater (with conditions)
A new customer's connection to an Oklahoma public water supply system.
- The public water supply system must not allow the connection unless the customer has an approved sewage disposal system defined in OAC 252:641 or OAC 252:656.
- This is a condition on a public water supply system allowing a new customer connection; it does not itself require every property to connect to public water.
- The cited rule was amended effective September 15, 2025.
“PWS systems must not allow the connection of a new customer without an approved sewage disposal system, as defined in OAC 252:641 (Individual and Small Public On-Site Sewage Disposal Systems) or OAC 252:656 (Water Pollution Control Construction).”
OAC 252:631, Public Water Supply Operation ↗Re-checked Nov 4, 2026
Agricultural exemptionAvailable (with conditions)
Sales-tax exemption for qualifying farm or ranch purchases of personal property used for agricultural endeavors in Johnston County.
- The applicant must be an individual or business engaged in farming or ranching for profit.
- An agricultural exemption permit card must be obtained from the Oklahoma Tax Commission and used for qualifying tax-exempt purchases.
- The exemption applies to personal property for the farm, ranch, or agricultural endeavor, such as tractors, feed, fertilizer, and related essentials.
- Vehicle purchases are not exempt except all-terrain vehicles, utility vehicles, and off-road motorcycles.
- Applicants should submit documentation demonstrating regular farming or ranching for profit, such as IRS Schedule F, Form 4835, Forms 1065, 1120, 1120S, or a three-year business plan.
“individuals or businesses engaged in farming or ranching for profit may qualify for an agricultural exemption.”
Oklahoma Tax Commission: Exemptions ↗Re-checked Oct 5, 2026
2 more reviewed findings on this topic
- Available (with conditions) — The zoning power conferred by Oklahoma Title 19 on municipalities and counties, including county unincorporated areas, as applied to usual farm buildings used for agricultural purposes and the planning of agricultural crops.
  “shall not apply to [...] the usual farm buildings for agricultural purposes”
  Oklahoma Statutes, Title 19 — Zoning exemptions and farm-building permits ↗Re-checked Sep 12, 2026
- Available (with conditions) — Construction of a farm home or other farm building under the Title 19 city-county planning and zoning act.
  “No fees or permits shall be required for [...] any farm building.”
  Oklahoma Statutes, Title 19, Section 19-863.25 ↗Re-checked Sep 12, 2026
Subdividing landRegulated (with conditions)
Residential developments created or intended to be created outside the corporate limits of a city or town, including unincorporated Johnston County
- A plat describing the methods of sewage treatment must be filed with the Oklahoma Department of Environmental Quality.
- Approval must be obtained before recording the plat, offering lots for sale, or beginning construction.
- The plat must describe water supply and sewage treatment, identify the actual lot size of each lot, and identify public water supply sources within 300 feet.
- After approval, the plat receives an approval stamp, restrictions if any, the Department or local representative signature, and the date.
- Approval becomes effective 30 days after filing with the Department unless specifically rejected earlier.
- A county clerk may not record a plat containing a lot smaller than 2.5 acres outside a municipality unless it bears the Department's approved stamp.
- For individual-residence tracts with no tract smaller than 2.5 acres, the Department must approve the plat if no lot is within 300 feet of a public water supply source.
- After receiving approval, the plat must be filed in the land records of the county where the development is located.
- Knowingly creating the development without approval or recordation is a misdemeanor punishable by a $500 to $5,000 fine per violation.
minimum lot size: >= 2.5 acres (Outside corporate limits of a municipality; DEQ approval stamp required for smaller lots.) · public water supply separation: >= 300 feet (Individual-residence tract approval condition.) · approval effectiveness: 30 days (Effective after filing with DEQ unless specifically rejected sooner.) · fine per violation: 500-5000 USD (Misdemeanor penalty.)
“Approval of the plat shall be obtained prior to recording the plat, offering a lot or lots for sale or beginning construction within such residential development.”
Oklahoma Statutes, Title 27A, § 2-6-403 ↗Re-checked Oct 6, 2026
3 more reviewed findings on this topic
- Regulated (with conditions) — Subdivision and recording of plats affecting Johnston County, including unincorporated areas outside municipal corporate limits.
  “The county clerk shall not file of record any plat [...] unless the plat bears the stamp of approval of the Department of Environmental Quality”
  Oklahoma Statutes, Title 19, Counties and County Officers ↗Re-checked Oct 5, 2026
- Regulated (with conditions) — Plats submitted for recording in Johnston County, including unincorporated and incorporated areas, subject to applicable municipal and county filing rules.
  “Any plat submitted for recording shall have the following specifications:”
  Oklahoma Statutes, Title 11, §11-41-108, Plat record specifications ↗Re-checked Oct 5, 2026
- Regulated (with conditions) — Residential developments outside Oklahoma municipal corporate limits, including plat approval and recording requirements.
  “Approval of the plat shall be obtained prior to recording the plat”
  Oklahoma Statutes, Title 27A — Environment and Natural Resources ↗Re-checked Sep 12, 2026
Driveway accessLimited
Driveways connecting to Federal or State Highway rights-of-way in Oklahoma.
- An approved Driveway Agreement is required before work on the State Highway right-of-way.
- The application requires an original Driveway Agreement and a sketch or site plan.
- Drainage must be properly disposed of and runoff may not run onto the highway.
- If the driveway is within city limits, the Agreement must be signed or permitted in writing by a city authority.
- No alteration or relocation may be made without prior written permission from ODOT or its authorized representatives.
- The permit expires if the driveway is not constructed within six months after the effective date unless a written extension is requested.
permit expiration period: 6 months (Unless the applicant requests a written time extension from ODOT.)
“Under no circumstances shall the applicant be permitted to do any work on the State Highway right-of-way until an approved copy of the application is in hand.”
Instructions for Driveway Permit Application ↗Re-checked Sep 12, 2026
Permit feesPublished (with conditions)
State Fire Marshal building permits and plan reviews where the State Fire Marshal has jurisdiction, including geographical areas where local authorities do not require a building permit for International Building Code use and occupancy classifications.
- The State Fire Marshal FAQ states: "In all geographical areas wherein no building permit is required by local authorities such permit shall be obtained from the State Fire Marshal's Office for all Use and Occupancy Classifications identified in the International Building Code®."
- A jurisdiction with a current signed agreement authorizing plan reviews and inspections may eliminate the need for another State Fire Marshal permit.
- Credit-card payment fees are 2.25% plus $2.00; ACH bank-routing fee is $1.00 per transaction.
- Permit fees include 50% and 100% on-site inspections and an occupancy permit. Additional on-site inspections caused by failure to comply with applicable codes or deviation from approved plans are billed at $100.00 per inspection.
minimum permit fee: 100 USD · building permit fee: 0.2 USD per square foot · sprinkler plan review only: 0.06 USD per square foot · fire alarm plan review only: 0.06 USD per square foot · additional on-site inspection: 100 USD per inspection (When caused by failure to comply with applicable codes or deviation from approved plans.)
“Minimum permit fee - $100.00 Buildings: per square foot - $0.20 Sprinkler plan review only: [...] $0.06 Fire alarm plan review only: [...] $0.06”
oklahoma.gov ↗Re-checked Nov 13, 2026
One more reviewed finding on this topic
- Published (with conditions) — Construction permits and renewals issued by a state agency, municipality, or other political subdivision for work governed by Oklahoma Uniform Building Code Commission codes.
  “Currently the fees are set at $4.00 per permit.”
  FAQs ↗Re-checked Sep 12, 2026
county zoning authorityLimited
County zoning authority in unincorporated areas under Oklahoma Statutes Title 19, Sections 868.1 through 868.22.
- The authority applies only to counties having a population in excess of 500,000 according to the latest Federal Decennial Census.
- The zoning authority is for unincorporated areas of the county.
- Existing lawful uses are protected except as otherwise provided by the statute.
- The statute excludes public utilities subject to Corporation Commission or similar state or federal regulation, usual farm buildings for agricultural purposes, planting agricultural crops, and extraction of minerals.
- Zoning regulations must address the statutory public-health, safety, welfare, transportation, utilities, public facilities, and land-use purposes.
county population threshold: > 500000 persons (latest Federal Decennial Census)
“population in excess of five hundred thousand (500,000)”
Oklahoma Statutes - Title 19, Counties and County Officers ↗Re-checked Oct 5, 2026
2 more reviewed findings on this topic
- Limited — County zoning regulations for unincorporated areas under Title 19, §§19-868.1 through 19-868.22.
  “The board of county commissioners is hereby empowered to adopt zoning regulations effective in the unincorporated areas of the county for the purposes of promoting the health, safety, peace, morals, comfort and the general welfare of the inhabitants; lessening danger and congestion in public transportation and travel; securing safety from fire and other dangers; preventing overcrowding of land; avoiding undue concentration of population; providing adequate police protection, transportation, water, sewerage, schools, parks, forests, recreational facilities, airports, military and naval facilities, and other public requirements; and preventing undue encroachment thereon. The zoning power hereby conferred shall not be exercised so as to deprive the owner of any existing property of its use or maintenance for the purpose to which it is then lawfully devoted except as hereinafter provided; nor shall the provisions of this act apply to the erection, installation and use of structures and equipment by public utilities subject to the jurisdiction and regulation of the Corporation Commission of the State of Oklahoma or other similar state or federal regulatory bodies; nor to the erection or use of the usual farm buildings for agricultural purposes, the planting of agricultural crops or the extraction of minerals.”
  Oklahoma Statutes - Title 19. Counties and County Officers ↗Re-checked Sep 21, 2026
- Limited — County planning and zoning through a cooperative city-county planning commission for the unincorporated area of an eligible county.
  “county plan within the unincorporated area”
  Oklahoma Statutes - Title 19. Counties and County Officers ↗Re-checked Sep 21, 2026
county building authorityLimited
County adoption and enforcement of building or fire codes in unincorporated areas under 19 O.S. § 868.17A.
- The authority applies only in unincorporated areas.
- The provision does not apply to counties not subject to 19 O.S. §§ 868.1 through 868.22; those provisions apply only to counties with a population in excess of 500,000 according to the latest Federal Decennial Census.
- Public-utility electric supply and communication lines regulated by the Corporation Commission are excluded.
- The county may prescribe permits, notices, inspection procedures, and reasonable fees sufficient to cover inspection and enforcement expenses.
- Building inspectors must be licensed by Oklahoma.
county population threshold: > 500000 persons (latest Federal Decennial Census) · inspection and enforcement fees: reasonable and sufficient to meet inspection and enforcement expense
“may, by resolution, adopt building codes, fire codes”
Oklahoma Statutes - Title 19, Counties and County Officers ↗Re-checked Oct 5, 2026
One more reviewed finding on this topic
- Limited — County adoption and enforcement of building and fire codes, including permits and inspections, in unincorporated areas under Title 19, §§19-868.1 through 19-868.22.
  “The board of county commissioners may, by resolution, adopt building codes, fire codes, or both building and fire codes which shall be designed for the purpose of promoting, benefiting, and protecting the public health, safety and welfare of the people of this state. The codes adopted pursuant to this section shall be applicable only in the unincorporated areas of the county. All building materials, equipment, and methods of installation or construction shall be at least the equivalent of that prescribed in any building or fire code adopted by the board of county commissioners in quality, strength, effectiveness, fire resistance, durability, and safety. Any codes adopted pursuant to this section shall not apply to the installation and maintenance of electric supply and communication lines of public utilities and public service companies which are regulated by the Corporation Commission. The provisions of this section shall not apply to any area located within any county not subject to the provisions of Section 868.1 through 868.22 of Title 19 of the Oklahoma Statutes. Building inspectors may be employed by a county to enforce building or fire codes. The building inspectors shall be licensed by the State of Oklahoma. The building inspectors shall enforce the provisions of any building or fire code adopted pursuant to this section and shall be authorized to inspect all buildings for the purpose of discharging the duties imposed by this section or by any building or fire code adopted by the board of county commissioners. The board of county commissioners may adopt rules to carry out the inspections to enforce the building or fire codes, may prescribe the necessary permits, notices, and inspection procedures and may set and determine fees. The fees shall be reasonable and shall be sufficient to meet the expense of inspection and enforcement of the building or fire codes.”
  Oklahoma Statutes - Title 19. Counties and County Officers ↗Re-checked Sep 21, 2026

Inside cities and towns in Johnston County

Municipal rules found while researching the county. They apply inside that city or town, not to unincorporated land.

Local zoningPresent (with conditions)
Land, buildings, structures, and improvements within the City of Tishomingo, Johnston County, Oklahoma.
- Uses and construction must comply with the requirements of the zoning district in which the property is located.
- This claim applies within Tishomingo city limits and does not establish zoning requirements in unincorporated Johnston County or other municipalities.
“This article classifies and regulates the use of land, buildings, and structures within the limits of the city.”
Article 14.03: Zoning Ordinance - City of Tishomingo, OK ↗Re-checked Sep 11, 2026

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

Short-term rentals — Short-term rental use in Johnston County, Oklahoma.

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Water rights & wells in Johnston County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Oklahoma’s water agency.

Actively managed

This basin is under active state management — new water use is scrutinized, though a domestic well is usually still allowed.

Household wellExempt — no permit or water right

Oklahoma groundwater is tied to the overlying land rather than allocated by prior appropriation, and 'domestic use' — household use, farm/domestic animals, and irrigation of up to 3 acres of gardens/orchards/lawns — needs no permit at all.

Limit: Domestic use exempt from any permit; non-domestic groundwater allocated by overlying land ownership (default 2 acre-ft/acre/yr)

Oklahoma Water Resources Board — Groundwater Permitting ↗

Arbuckle-Simpson Sensitive Sole Source Groundwater Basinpartial of county
Oklahoma's only designated 'sensitive sole source' groundwater basin; permitted allocation capped far below the statewide default (0.20 acre-ft/acre/yr) to protect spring/stream flow, with a moratorium on out-of-basin municipal permits; domestic use remains exempt.
Oklahoma Water Resources Board — Arbuckle-Simpson Water Use Permitting ↗

Hybrid state (appropriation + riparian). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Oklahoma state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Johnston County, Oklahoma

Is Johnston County a good place to live off-grid or homestead?

Johnston County scores 74/100 on the Bolthole Index, a strong county profile. Its strengths: manageable long-term carry cost and low administrative friction for a quiet rural property.

How much does land cost in Johnston County, Oklahoma?

Land in Johnston County runs about $2,523 per acre, based on the latest county data.

What is the water situation in Johnston County?

Johnston County gets about 42.6" of rain a year, with severe drought in roughly 20.4% of years. On water rights, Johnston County lies in the Arbuckle-Simpson Sensitive Sole Source Groundwater Basin — Oklahoma's only designated 'sensitive sole source' groundwater basin; permitted allocation capped far below the statewide default (0.20 acre-ft/acre/yr) to protect spring/stream flow, with a moratorium on out-of-basin municipal permits; domestic use remains exempt..

How remote is Johnston County?

A representative private-land location has about 5,751 people within a 30-minute drive and 3,444,178 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

Building permits, zoning and land rules in Johnston County, Oklahoma