Bolthole Index

Custer County, Oklahoma

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

52Index Score / 100
#49 of 77 in Oklahoma

Unincorporated Custer County, Oklahoma does not require a county building permit for ordinary construction, but work in a county right-of-way and development in a special flood hazard area require separate county permits12. The county has no zoning, while Oklahoma DEQ issues septic authorizations34. City ordinances still control inside incorporated municipalities3.

At a glance

Building permit
Not required for ordinary construction in unincorporated areas; right-of-way and floodplain permits are separate12
Zoning
No county zoning in unincorporated Custer County; city ordinances may apply inside municipalities3
Septic
Authorization to Construct required from Oklahoma DEQ before installation or modification5
RV and temporary camping
No county zoning restriction in unincorporated areas; septic, health and floodplain rules may still apply67
Tiny home
No county zoning restriction in unincorporated areas; other applicable rules remain8
Minimum home size
No county zoning minimum in unincorporated Custer County9
Domestic well
No state water permit for qualifying domestic groundwater use10

Who to call

Building permits

Custer County Clerk and Board of County Commissioners

County ingress and egress permits; the Commissioner’s Office also holds special-flood-hazard-area development permit information

580.323.4420

[email protected]

PO Box 300, 675 W. B Street Arapaho, OK 73620

Septic permits

Oklahoma Department of Environmental Quality - Environmental Complaints & Local Services

On-site sewage reports, soil evaluation, Authorization to Construct review and septic installation inspection

405-702-6100

707 N Robinson Oklahoma City, OK, 73102

Online permits →

Also useful

Oklahoma State Fire Marshal - unincorporated home permit exemption

Confirms the State Fire Marshal permit exemption for specified residential and accessory structures in unincorporated county areas

Contact details are copied from each office’s official page and were checked against it on September 27, 2026.

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

No county building permit is required for ordinary construction in unincorporated Custer County1. A single-family dwelling, duplex, barn, shed or attached carport in an unincorporated county area also does not require the Oklahoma State Fire Marshal permit that can apply to other projects11. Two county approvals remain important: an encroachment on or into a county right-of-way requires a permit and applicable fees, and a project in a special flood hazard area requires a development permit12. Custer County has not confirmed whether it has adopted a building code, requires construction inspections or issues certificates of occupancy, so ask the County Clerk and the relevant commissioner before finalizing plans. Inside a city or town, municipal ordinances may produce a different answer3.

Who handles Custer County permits, and how do you reach them?

Custer County directs ingress and egress permit questions to the County Clerk, reachable at 580.323.4420 or at PO Box 300, 675 W. B Street, Arapaho, OK 7362012. The county’s forms page provides an ingress and egress permit and a floodplain permit application12. For a project in a special flood hazard area, the County Commissioner’s Office at the Arapaho courthouse holds the development-permit information2. Oklahoma DEQ, rather than the county, handles septic authorization and assigns an application to the local environmental specialist based on the property location513. A driveway connecting to a federal or state highway requires an approved Oklahoma Department of Transportation Driveway Agreement before work begins in the highway right-of-way14.

Does Custer County have zoning?

Unincorporated Custer County has no county zoning ordinance, and the county’s statement expressly leaves state statutes and city ordinances in place3. As a result, county zoning does not set a minimum dwelling size, setbacks, lot coverage or building height on land outside incorporated municipalities9151617. The same county zoning baseline does not restrict tiny-home occupancy, accessory dwellings or manufactured-home occupancy in unincorporated areas, but septic, floodplain, health and state installation rules can still control a project81819. An occupied manufactured home is treated as a permanent installation under Oklahoma rules and must follow the applicable approved installation standard20. For newly platted residential development outside municipal limits, state plat rules can require agency approval for smaller lots even though Custer County has no zoning minimum21.

How do septic permits work in Custer County?

Oklahoma DEQ issues the septic approval for Custer County: before a new system is installed or an existing system is modified, an Authorization to Construct must be purchased and issued513. DEQ first reviews the on-site sewage report, then assigns the authorization to the local environmental specialist based on the property location, and the installation must be inspected and approved before operation unless a certified installer follows the state’s self-inspection route13. Only 18.8% of Custer County soils are rated without severe limitations for a conventional drain field, so do not assume a standard lateral field will fit a parcel before soil evaluation22. Contact Environmental Complaints & Local Services at 405-702-6100 for the specialist covering the property13. A qualifying domestic groundwater well does not need a state water permit, while a non-domestic well needs OWRB authorization and approval before drilling1023.

Can you live in an RV or tiny home in Custer County?

County zoning does not restrict RV occupancy, temporary camping or tiny-home occupancy on land in unincorporated Custer County678. That answer is limited to county zoning: septic, public-health, floodplain and other property-specific rules can still apply, and city ordinances govern land inside incorporated municipalities673. A tiny home has no county zoning minimum dwelling size in unincorporated Custer County, but the county has not confirmed a building code, inspection requirement or certificate-of-occupancy process9. Ask the County Clerk about those unresolved construction questions and contact DEQ before installing or changing any on-site sewage system125. An occupied manufactured home must comply with Oklahoma’s permanent-installation requirements even though county zoning does not bar the use2019.

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

  1. Confirm that the parcel is outside an incorporated municipality; city ordinances can apply inside city limits even though unincorporated Custer County has no zoning3.
  1. Ask the County Clerk whether the site touches a county right-of-way or special flood hazard area, because those conditions trigger separate county permits12.
  1. Arrange the DEQ on-site sewage report and obtain an Authorization to Construct before installing or modifying septic513.
  1. If access connects to a federal or state highway, obtain the ODOT Driveway Agreement before right-of-way work begins14.
  1. Confirm water: qualifying domestic groundwater use needs no state water permit, but non-domestic drilling requires prior OWRB authorization1023.
  1. Ask the County Clerk about building-code, inspection and occupancy questions that Custer County has not confirmed.

What should you check before buying land in Custer County?

Check legal access, flood status, septic feasibility and water before closing. County right-of-way encroachments require a permit, and projects in a special flood hazard area require a development permit12. With only 18.8% of county soils rated without severe conventional-drain-field limitations, a soil evaluation can materially change the usable building area and system choice22. Custer County averages 28.6 inches of annual precipitation and experiences severe drought in 38.7% of years, so verify actual well records and water reliability for the parcel2425. About 98.3% of county land is at a slope of 15% or less, but parcel-level drainage and flood conditions still matter26. For budgeting, the effective property-tax rate is about 0.7%, and the median annual property-tax bill is $1,1972728.

Watch-outs

  • Custer County has not confirmed a building-code adoption, inspection requirement, certificate-of-occupancy process or owner-builder exemption for unincorporated land; ask the County Clerk before construction2912.
  • No county zoning does not waive the separate right-of-way, floodplain or septic approvals that may apply to a rural project125.
  • The county has not published the amount of its right-of-way permit fee in the reviewed material, so request the current fee from the County Clerk112.

Sources

  1. Custer County Zoning Regulations, quoted and re-checked
  2. Custer County Zoning Regulations, quoted and re-checked
  3. Custer County Zoning Regulations, quoted and re-checked
  4. Oklahoma DEQ On-Site Sewage Treatment (2026 county census)
  5. On-Site Sewage Information, quoted and re-checked
  6. Custer County Zoning Regulations, quoted and re-checked
  7. Custer County Zoning Regulations, quoted and re-checked
  8. Custer County Zoning Regulations, quoted and re-checked
  9. Custer County Zoning Regulations, quoted and re-checked
  10. Apply for a Water Permit, quoted and re-checked
  11. Oklahoma State Fire Marshal - unincorporated home permit exemption (oklahoma.gov)
  12. Custer County Clerk and Board of County Commissioners (custer.okcounties.org)
  13. Oklahoma Department of Environmental Quality - Environmental Complaints & Local Services (oklahoma.gov)
  14. Instructions for Driveway Permit Application (Oklahoma statewide rule), quoted and re-checked
  15. Custer County Zoning Regulations, quoted and re-checked
  16. Custer County Zoning Regulations, quoted and re-checked
  17. Custer County Zoning Regulations, quoted and re-checked
  18. Custer County Zoning Regulations, quoted and re-checked
  19. Custer County Zoning Regulations, quoted and re-checked
  20. Title 765 Oklahoma Used Motor Vehicle and Parts Commission Rules and Regulations (Oklahoma statewide rule), quoted and re-checked
  21. Oklahoma Statutes, Title 27A — Environment and Natural Resources (Oklahoma statewide rule), quoted and re-checked
  22. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  23. Wells & Licensing, quoted and re-checked
  24. Annual precipitation: Bolthole Index county data
  25. Share of years in severe drought: Bolthole Index county data
  26. Share of land at 15% slope or less: Bolthole Index county data
  27. Effective property tax rate: Bolthole Index county data
  28. Median property tax bill: Bolthole Index county data
  29. (2026 county census)

Written September 27, 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.

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County locator

Custer County in Oklahoma

52
County map
Custer County highlighted among the Oklahoma counties · colored by Index score

How Custer County scores

Seclusion7880% ev.
Self-Sufficiency2298% ev.
Admin Boringness7090% ev.
Durability39100% ev.
Property Autonomy69100% ev.
Carry Cost85100% ev.

Evidence strength: 93%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$183kTypical home
0.7%Property tax
$1,869Land / acre
28.6"Annual rain
38.7% of yrsSevere drought
43.6 / yr (+25.5)Mid-century 100°F days
27.3 daysMid-century dry spell
2" (+4.1%)Mid-century 1-day rain
1.38×Wildfire change factor
100%Forward climate coverage
$2,874Home insurance / yr
0% / yrInsurance growth
0.81%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
2,038People within 30 min
986,886People within 2 hr
14,217Radius comparison (15 mi)
28.6People / sq mi
0%Federal land
98.3%Land at 15% slope or less
18.8%Septic soil without severe limits
117,533 acWorkable land screen
5.7%Wooded land
14.6 tonsBiomass / forest ac
59.8°FAvg temp

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Answers from the rulebook for Custer County

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

Custer County rules

  • Building permitLimited

    Construction in unincorporated Custer County.

    • No county building permit is required in unincorporated areas.
    • A permit is required for encroachments to or on county rights-of-way.
    • Development permits are required in special flood hazard areas.
    • Applicable fees are necessary for right-of-way encroachment permits.
    “There are also no building permits required in unincorporated areas of Custer County. However, please keep in mind that a permit is required for any encroachments to or on county right-of-ways and payment of applicable fees will be necessary.”
  • County-wide zoningAbsent (with conditions)

    County zoning in unincorporated Custer County.

    • The county letter excepts regulations governed by Oklahoma statutes and city ordinances.
    • This claim does not establish rules inside incorporated municipalities.
    “This letter is to certify that Custer County DOES NOT have any zoning or fire safety and health regulations, except any governed by State Statutes or any city ordinance in Custer County, Oklahoma.”
  • Zoning districts · by state lawNo county rule

    Unincorporated Custer County: no county rule sets this, because Oklahoma law gives zoning power only to certain counties, and Custer County has no zoning ordinance. Custer County's own reviewed answer confirms it has no county-wide zoning.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • The county must have within its boundaries more than 50 percent of the incorporated area of a city having not less than 180,000 population according to the last preceding or any future Federal Decennial Census.
    • The county must form a cooperative planning commission with the qualifying city and act under the procedures of Title 19, §§19-863.1 through 19-863.48.
    “county plan within the unincorporated area”
  • Minimum dwelling sizeNone (with conditions)

    County zoning minimum-dwelling-size rules in unincorporated Custer County.

    • No county zoning rule is stated; state statutes and city ordinances are excepted.
    “This letter is to certify that Custer County DOES NOT have any zoning or fire safety and health regulations, except any governed by State Statutes or any city ordinance in Custer County, Oklahoma.”
  • Minimum lot sizeNone (with conditions)

    County zoning minimum-lot-size rules in unincorporated Custer County.

    • No county zoning rule is stated; state statutes and city ordinances are excepted.
    “This letter is to certify that Custer County DOES NOT have any zoning or fire safety and health regulations, except any governed by State Statutes or any city ordinance in Custer County, Oklahoma.”
  • SetbacksNone (with conditions)

    County zoning setback rules in unincorporated Custer County.

    • No county zoning rule is stated; state statutes and city ordinances are excepted.
    “This letter is to certify that Custer County DOES NOT have any zoning or fire safety and health regulations, except any governed by State Statutes or any city ordinance in Custer County, Oklahoma.”
  • Lot coverageNone (with conditions)

    County zoning lot-coverage rules in unincorporated Custer County.

    • No county zoning rule is stated; state statutes and city ordinances are excepted.
    “This letter is to certify that Custer County DOES NOT have any zoning or fire safety and health regulations, except any governed by State Statutes or any city ordinance in Custer County, Oklahoma.”
  • Building heightNone (with conditions)

    County zoning building-height rules in unincorporated Custer County.

    • No county zoning rule is stated; state statutes and city ordinances are excepted.
    “This letter is to certify that Custer County DOES NOT have any zoning or fire safety and health regulations, except any governed by State Statutes or any city ordinance in Custer County, Oklahoma.”
  • Living in an RVUnrestricted (with conditions)

    County zoning restrictions on RV occupancy in unincorporated Custer County.

    • The county letter excepts state statutes and city ordinances.
    • This finding does not establish that RV occupancy satisfies septic, health, floodplain, or other applicable rules.
    “This letter is to certify that Custer County DOES NOT have any zoning or fire safety and health regulations, except any governed by State Statutes or any city ordinance in Custer County, Oklahoma.”
  • Camping on your landUnrestricted (with conditions)

    County zoning restrictions on temporary camping in unincorporated Custer County.

    • The county letter excepts state statutes and city ordinances.
    • Other public-health, septic, floodplain, or property-specific rules may apply.
    “This letter is to certify that Custer County DOES NOT have any zoning or fire safety and health regulations, except any governed by State Statutes or any city ordinance in Custer County, Oklahoma.”
  • Tiny homesUnrestricted (with conditions)

    County zoning restrictions on tiny-home occupancy in unincorporated Custer County.

    • The county letter excepts state statutes and city ordinances.
    • Building, septic, floodplain, and health requirements are not resolved by this county zoning statement.
    “This letter is to certify that Custer County DOES NOT have any zoning or fire safety and health regulations, except any governed by State Statutes or any city ordinance in Custer County, Oklahoma.”
  • Manufactured homesUnrestricted (with conditions)

    County zoning restrictions on manufactured-home occupancy in unincorporated Custer County.

    • The county letter excepts state statutes and city ordinances.
    • This does not determine state manufactured-home, septic, or floodplain compliance.
    “This letter is to certify that Custer County DOES NOT have any zoning or fire safety and health regulations, except any governed by State Statutes or any city ordinance in Custer County, Oklahoma.”
  • Accessory dwellingsUnrestricted (with conditions)

    County zoning restrictions on accessory dwellings in unincorporated Custer County.

    • The county letter excepts state statutes and city ordinances.
    • Building, septic, floodplain, and health rules may still apply.
    “This letter is to certify that Custer County DOES NOT have any zoning or fire safety and health regulations, except any governed by State Statutes or any city ordinance in Custer County, Oklahoma.”
  • Building in a floodplainRequired

    Projects located within a special flood hazard area in unincorporated Custer County.

    • The source identifies the requirement as a development permit.
    • The county commissioner’s office holds the relevant information.
    “Also, Development Permits are required if your project is located within a special flood hazard area. This information is available in the Custer County Commissioner’s Office in the Courthouse at Arapaho, Oklahoma.”

Oklahoma rules that apply here

  • Who permits septicState

    On-site sewage treatment systems in Custer County under Oklahoma's statewide program.

    • DEQ assigns an ATC to the local DEQ Environmental Specialist based on property location.
    • Alternative systems require prior DEQ approval.
    “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.”
    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.”
  • Well permitNot required

    Domestic use of groundwater and domestic groundwater wells used for household purposes, qualifying livestock, or irrigation of less than three acres statewide.

    • The domestic-use exception applies to groundwater use for household purposes, farm and domestic animals up to the normal grazing capacity of the land, and irrigation not exceeding three acres for gardens, orchards, and lawns.
    • The OWRB wells page also states that intent-to-drill authorizations are not required for domestic groundwater wells used for household purposes, livestock up to the land’s grazing capacity, and irrigation of less than three acres.

    irrigation area: < 3 acres (Domestic-use exception described by OWRB.)

    “A water permit is not required for domestic use of groundwater”
    2 more reviewed findings on this topic
    • Not required — Domestic groundwater wells serving household purposes, qualifying livestock, or irrigation of less than 3 acres in Custer County.
      “In Oklahoma, groundwater is considered private property that belongs to the overlying surface owner. A water permit is not required for domestic use of groundwater, but for all other uses, groundwater is subject to reasonable regulation by the OWRB.”
    • Required — Non-domestic groundwater wells in Custer County.
      “Any well drilling contractor who intends to drill a groundwater well for non-domestic use must apply for authorization and receive approval from the OWRB prior to drilling. Authorization will not be issued for any well location that does not have an active groundwater use permit.”
  • Agricultural exemptionAvailable (with conditions)

    Construction of a farm home or other farm building under the Title 19 city-county planning and zoning act.

    • The statute states that no fees or permits are required for construction of any farm home or other farm building under this Act.
    • The quoted exemption is limited to the construction described in the statute and does not establish that every other state or local approval is waived.
    “No fees or permits shall be required for [...] any farm building.”
    One more reviewed finding 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”
  • Subdividing landRegulated (with conditions)

    Residential developments outside Oklahoma municipal corporate limits, including plat approval and recording requirements.

    • A person creating or intending to create a residential development outside a city or town must file a plat describing sewage-treatment methods with the Oklahoma Department.
    • Department approval must be obtained before recording the plat, offering lots for sale, or beginning construction within the residential development.
    • The plat must include water-supply and sewage-treatment information, actual lot sizes, and the location of public water-supply sources within 300 feet.
    • The plat must be filed in the county land records after Department approval.

    Department approval effective period: 30 days after filing unless specifically rejected earlier · public water-supply search radius: 300 feet

    “Approval of the plat shall be obtained prior to recording the plat”
  • 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.”
  • Permit feesPublished (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.

    • The OUBCC fee is not to exceed $5.00 for issuance and $5.00 for renewal.
    • The official FAQ states that current fees are $4.00 per permit.
    • The issuing state agency, municipality, or other political subdivision may levy an additional fee up to $0.50 per construction permit or renewal permit.

    permit issuance fee: 4 USD (The statutory range is not to exceed $5.00.) · permit renewal fee: 4 USD (The statutory range is not to exceed $5.00.) · additional issuing-jurisdiction fee: <= 0.5 USD (May be levied by the collecting state agency, municipality, or other political subdivision.)

    “Currently the fees are set at $4.00 per permit.”
  • Permit processPartial

    Projects subject to Oklahoma State Fire Marshal building-plan review.

    • All projects are reviewed through the OKSFM Accela Citizen Portal.
    • Plan review is not done over email.
    • Paper submittals mailed or dropped off at the office are not accepted.
    • Applicants must set up a login and password.
    • The page states that plans must meet minimum state codes adopted by the OUBCC.
    “All projects are reviewed through the OKSFM Accela Citizen Portal. Plan review is not done over email and paper submittals mailed or dropped off in the office are not accepted.”
  • county zoning authorityLimited

    County planning and zoning through a cooperative city-county planning commission for the unincorporated area of an eligible county.

    • The county must have within its boundaries more than 50 percent of the incorporated area of a city having not less than 180,000 population according to the last preceding or any future Federal Decennial Census.
    • The county must form a cooperative planning commission with the qualifying city and act under the procedures of Title 19, §§19-863.1 through 19-863.48.
    • The county plan applies within the unincorporated area of the county.
    • The county and city must contribute equal amounts to the cooperative commission's common fund.

    qualifying city population: >= 180000 persons (According to the last preceding or any future Federal Decennial Census.) · incorporated area of qualifying city within county: > 50 percent (The county must have more than 50 percent of the incorporated area of the qualifying city within its boundaries.)

    “county plan within the unincorporated area”

Still unanswered

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

  • Owner-builder exemption — Owner-builders in unincorporated Custer County.
  • Building code adopted — County building-code adoption in unincorporated Custer County.
  • Inspections — Building inspections in unincorporated Custer County.
  • Certificate of occupancy — Certificates of occupancy in unincorporated Custer County.
  • Off-grid sanitation — Off-grid sanitation systems in unincorporated Custer County.
2 more unanswered
  • Mandatory utility hookup
  • Short-term rentals

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.

Living off-grid in Custer County, Oklahoma

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

Custer County scores 52/100 on the Bolthole Index, a solid county profile. Its strengths: manageable long-term carry cost and sparse surroundings — about 2,038 people within a 30-minute drive. Watch-outs: workable self-sufficiency basics (28.6″/yr rainfall) and elevated mid-century heat, water, rain, or wildfire exposure.

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

Custer County requires a building permit only in limited cases (such as floodplains or specific zones), and it has no county-wide zoning. Onsite septic is permitted by Oklahoma Department of Environmental Quality (DEQ). These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

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

Living in an RV on your own land in Custer County is allowed: County zoning restrictions on RV occupancy in unincorporated Custer County. The county letter excepts state statutes and city ordinances. This finding does not establish that RV occupancy satisfies septic, health, floodplain, or other applicable rules. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Custer County, Oklahoma?

Land in Custer County runs about $1,869 per acre, based on the latest county data.

What is the water situation in Custer County?

Custer County gets about 28.6" of rain a year, with severe drought in roughly 38.7% of years.

How remote is Custer County?

A representative private-land location has about 2,038 people within a 30-minute drive and 986,886 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.

Off-grid gear

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

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How Custer compares in Oklahoma

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