Irion County, TX Building Permits, Zoning & Septic

No general building-permit requirement has been confirmed for an ordinary single-family home in unincorporated Irion County, Texas, and no county zoning ordinance has been identified.¹² Irion County does regulate subdivisions and Manufactured Home Rental Communities; an MHRC needs County plan approval before construction and may face infrastructure inspection.³⁴⁵ Septic permits go directly to TCEQ.⁶

At a glance

Building permit: No general permit confirmed for an ordinary home; MHRC construction needs County plan approval first¹⁷
Zoning: No county zoning ordinance identified²
Septic (OSSF) permit: Required directly through TCEQ; Irion County is not TCEQ's local authorized agent⁶
Single RV, tiny home or trailer on your own land: The one-space exception may avoid these development regulations, but residential occupancy is unconfirmed⁸
RV park, trailer park, tiny-home site or campground (multi-space): If it qualifies as a subdivision, it needs plat review and Commissioners Court approval⁸⁹
Manufactured Home Rental Community (MHRC): County plan approval is required; infrastructure may be inspected for a compliance certificate⁴⁵
Floodplain construction (within a platted development): Finished floor must sit at least 1 foot above base flood elevation¹⁰

Who to call

Also useful

Irion County District-County Clerk

Keeps the official record of Irion County's adopted Subdivision and Manufactured Home Rental Community Regulations, available for inspection, review and copying at the courthouse

325-835-2421

Irion County Courthouse, 209 North Park View Street, Mertzon, TX 76941

Contact details are copied from each office’s official page and were checked against it on September 29, 2026.

Do you need a building permit in Irion County, Texas?

No general building-permit requirement has been confirmed for an ordinary single-family home in unincorporated Irion County: Texas law limits county fire-code permit authority to qualifying counties and covered commercial, public and multifamily buildings.⁷ The confirmed county approval applies to a different project type: a Manufactured Home Rental Community (MHRC) needs its infrastructure plan approved before construction or occupancy.¹⁴ The County may inspect MHRC infrastructure during construction or at completion and issues a Certificate of Compliance when the work matches the approved plan; that is not a general inspection rule for ordinary buildings.⁵ Ask the County Clerk to confirm how the adopted subdivision and MHRC regulations affect your specific project before work begins.¹¹

Who handles subdivision, MHRC and septic questions in Irion County, and how do you reach them?

The Irion County Commissioners Court adopted the Subdivision and Manufactured Home Rental Community Regulations at its public meeting on June 24, 2025, and the Irion County District-County Clerk keeps the official record.¹¹ The adopted regulations govern plats, subdivisions and MHRCs in unincorporated Irion County and cover applicable procedures for roads, drainage, utilities, water, wastewater, floodplains, lot frontage and building setback lines.³ Inspect or copy the regulations at the Irion County Courthouse, 209 North Park View Street, Mertzon, TX 76941, or call 325-835-2421.¹¹ Before a qualifying RV park, trailer park, tiny-home development or campground is built, the developer must consult the County Commissioner for the precinct.⁸ Septic applications go directly to TCEQ because Irion County is not its authorized agent.⁶

Does Irion County have zoning?

Unincorporated Irion County has no county zoning ordinance, and Texas law does not give Irion County general zoning power.²¹² That means no county zoning rule sets minimum dwelling size, minimum lot size, general setbacks, lot coverage, building height or zoning districts on unincorporated land.¹² This does not mean every parcel is unrestricted: the adopted county regulations govern subdivisions and MHRCs and include applicable lot-frontage and building-setback-line requirements.³ Qualifying RV parks, trailer parks, tiny-home developments and campgrounds are handled as subdivisions and need a final plat approved by Commissioners Court before construction.⁸ Ask the relevant municipality about land inside city limits or its extraterritorial jurisdiction because the county guide does not establish municipal zoning rules.³

How do septic (OSSF) permits work in Irion County?

Every on-site sewage facility in Texas needs a permit and an approved plan before construction, alteration, repair or extension, with one narrow exception.¹³ The exception is a "10-acre rule": a single-family home on at least 10 acres, evaluated by a licensed site evaluator or professional engineer, with every part of the OSSF at least 100 feet from the property line, no other dwelling on the tract, and no nuisance or groundwater pollution.¹³ Irion County does not serve as TCEQ's authorized agent for OSSF permitting, so unlike some neighboring counties, applications for a septic permit here go directly to TCEQ rather than through a county office.⁶ If you're building a subdivision, RV park or MHRC rather than a single home, the Regulations separately require the development's plan to address water, sewer, septic and OSSF facilities before the county will approve it.¹⁴ With only 2.7% of Irion County's soils free of severe limits for a conventional septic drain field, expect most sites to need an engineered or alternative system.¹⁵

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

Irion County's development regulations do not answer whether you may live full-time in a single RV, trailer or tiny home on your land. The regulations do provide an exception for a developer accommodating no more than one non-MHRC lodging space on the property at a time, but an exception from these development rules is not an occupancy approval.⁸ Ask the County Clerk about residential occupancy and wastewater requirements before moving onto the parcel.¹¹ A qualifying multi-space RV park, trailer park, tiny-home development or campground is regulated as a subdivision and needs a final plat approved by Commissioners Court before construction.⁸⁹ The rules describe a tiny home as typically no larger than 600 square feet excluding lofts, whether towed or placed on land.¹⁶ An MHRC needs an approved infrastructure plan and may undergo County infrastructure inspection before receiving its Certificate of Compliance.¹⁴⁵

Building on land in Irion County: the steps, in order

Classify the project as an ordinary home site, a subdivision, a qualifying multi-space lodging development or an MHRC; the adopted county regulations govern subdivisions and MHRCs in unincorporated Irion County.³
Ask the County Clerk to confirm which plat, exemption, variance, fee and approval procedures apply before design work is final.³¹¹
For a qualifying RV park, trailer park, tiny-home development or campground, consult the County Commissioner for the precinct and obtain final-plat approval before construction.⁸
For an MHRC, submit the infrastructure plan and wait for County approval before construction or occupancy.⁴
Arrange for possible County inspection of MHRC infrastructure and obtain the Certificate of Compliance when the work matches the plan.⁵
Apply directly to TCEQ for the septic permit unless the statewide exemption applies.⁶¹³
If the regulated development includes mapped floodplain, show it on the plan and keep finished floors at least 1 foot above base flood elevation.¹⁰

What to check before you buy land in Irion County, Texas

Only 2.7% of Irion County's soils are rated without severe limits for a conventional septic drain field, so make the site evaluation and system cost an early purchase condition.¹⁵ The terrain is gentle, with 100% of land at a 15% slope or less, but tree cover is only 2.2% and severe drought occurs in about 18% of years.¹⁷¹⁸¹⁹ Irion County has 1,549 residents and about 1.5 people per square mile; the nearest city of 100,000 or more is about 83 miles from the county center.²⁰²¹²² Before buying land to divide or develop, confirm plat review, access, drainage, floodplain, utility, water and wastewater requirements because the adopted regulations cover those subjects where applicable.³ A new or changed driveway on a Texas state highway needs a fully executed TxDOT permit before right-of-way work begins.²³

Watch-outs

Irion County's adopted regulations govern subdivisions and MHRCs in unincorporated areas, including applicable plat, fee, road, drainage, water, wastewater and setback procedures.³
The one-space exception in Irion County's development regulations does not confirm that full-time RV or tiny-home occupancy is allowed; ask the County Clerk before relying on it.⁸¹¹
Irion County is not TCEQ's authorized agent for septic permits; apply directly to TCEQ, not the county, for an OSSF permit.⁶

Sources

Written September 29, 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.

How Irion County scores

Seclusion85100% ev.

Self-Sufficiency1496% ev.

Admin Boringness7290% ev.

Durability36100% ev.

Property Autonomy71100% ev.

Carry Cost7896% ev.

Evidence strength: 97%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$262kTypical home

1%Property tax

$1,345Land / acre

20.6"Annual rain

18% of yrsSevere drought

49.1 / yr (+34.8)Mid-century 100°F days

34.3 daysMid-century dry spell

1.63" (+6.3%)Mid-century 1-day rain

1.28×Wildfire change factor

100%Forward climate coverage

$2,519Home insurance / yr

0% / yrInsurance growth

0%Nonrenewal rate

single ZIP shrunk to state medianInsurance basis

33,736People within 2 hr

1,117Radius comparison (15 mi)

1.5People / sq mi

0%Federal land

100%Land at 15% slope or less

2.7%Septic soil without severe limits

17,933 acWorkable land screen

2.2%Wooded land

3.2 tonsBiomass / forest ac

64.8°FAvg temp

Answers from the rulebook for Irion County

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

Irion County rules

Building permitLimited
Manufactured home rental community construction in the unincorporated area of Irion County; the source establishes County plan approval before MHRC construction, not a general building permit requirement for ordinary buildings.
- The MHRC plan must be approved by the County before construction begins.
- The rule applies to MHRCs in the unincorporated area of Irion County.
- The source does not establish a general county building-permit program for ordinary residential or commercial construction.
“Construction of the MHRC may not begin (and the MHRC may not be occupied by tenants or lessees) before the date the plan is approved by the County.”
Subdivision and Manufactured Home Rental Community Regulations for Irion County, Texas ↗Re-checked Sep 11, 2026
InspectionsLimited
Infrastructure inspection for manufactured home rental communities in the unincorporated area of Irion County.
- The County may require inspection during or upon completion of MHRC infrastructure construction.
- If the inspector finds compliance with the plan, the County issues an MHRC Certificate of Compliance.
- This source does not establish a general inspection requirement for all buildings in the county.
“The County may require inspection of the infrastructure during or on completion of construction. If the inspector determines that the infrastructure complies with the plan, the County shall issue the MHRC Certificate of Compliance in accordance with § 232.007 of the Texas Local Government Code.”
Subdivision and Manufactured Home Rental Community Regulations for Irion County, Texas ↗Re-checked Sep 11, 2026
Zoning districts · by state lawNo county rule
Unincorporated Irion County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Irion County has no zoning ordinance. The county legal census found no county zoning ordinance, citing newtools.cira.state.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Minimum dwelling size · by state lawNo county rule
Unincorporated Irion County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Irion County has no zoning ordinance. The county legal census found no county zoning ordinance, citing newtools.cira.state.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Minimum lot size · by state lawNo county rule
Unincorporated Irion County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Irion County has no zoning ordinance. The county legal census found no county zoning ordinance, citing newtools.cira.state.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Setbacks · by state lawNo county rule
Unincorporated Irion County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Irion County has no zoning ordinance. The county legal census found no county zoning ordinance, citing newtools.cira.state.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Lot coverage · by state lawNo county rule
Unincorporated Irion County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Irion County has no zoning ordinance. The county legal census found no county zoning ordinance, citing newtools.cira.state.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Building height · by state lawNo county rule
Unincorporated Irion County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Irion County has no zoning ordinance. The county legal census found no county zoning ordinance, citing newtools.cira.state.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Living in an RVLimited
RV parks and other non-MHRC development projects in unincorporated Irion County that qualify for regulation as subdivision projects.
- The project must be created after the effective date of the Regulations.
- The project must not qualify as a Manufactured Home Rental Community but must qualify as a subdivision under the Regulations.
- A final plat must be prepared and approved by the Commissioners Court before construction.
- Before construction, the developer must consult the County Commissioner having jurisdiction.
- The Regulations do not apply to a developer accommodating no more than one non-MHRC development-project lodging space on the property at any one time.
- The document is labeled a proposed public-hearing draft and leaves the 2025 effective-date day blank; current enforceability and the exact effective date require confirmation.
“Development projects in the unincorporated area of Irion County, Texas which do not qualify for regulation as MHRC development pursuant to these Regulations (such as trailer parks, RV parks, Tiny Home sites, and Man Camps) -- but do qualify for regulation as subdivision development projects under these Regulations -- will be regulated by the County as subdivisions pursuant to these Regulations, including the applicable provisions of this Exhibit J.”
Irion County, Texas — Proposed 2025 Subdivision/MHRC Regulations ↗Re-checked Sep 11, 2026
Camping on your landLimited
Campgrounds and other non-MHRC development projects in unincorporated Irion County that qualify as subdivisions.
- The project must be created after the effective date of the Regulations.
- The project must not qualify as a Manufactured Home Rental Community but must qualify as a subdivision.
- A final plat must be approved by the Commissioners Court before construction.
- The one-lodging-space exception and pre-construction County Commissioner consultation requirement apply.
- The document leaves the specific 2025 effective date blank and is labeled proposed/public-hearing draft.
“As used in this Exhibit J, a “Non-MHRC Development Project” shall mean an RV Park, trailer park, Tiny Home development, Man Camp, or campground, created after the effective date of these Regulations, and which: (a) does not qualify for regulation as a Manufactured Home Rental Community (MHRC) pursuant to these Regulations; but (b) does qualify for regulation as a subdivision pursuant to these Regulations.”
Irion County, Texas — Proposed 2025 Subdivision/MHRC Regulations ↗Re-checked Sep 11, 2026
Tiny homesLimited
Tiny Home developments in unincorporated Irion County that qualify as non-MHRC subdivision development.
- The project must be created after the effective date of the Regulations.
- The project must not qualify as an MHRC but must qualify as a subdivision.
- A final plat must be prepared and approved by the Commissioners Court.
- No more than one non-MHRC development-project lodging space is exempted from these Regulations at any one time.
- The document defines a Tiny Home as typically no larger than 600 square feet excluding lofts, towed on a trailer or placed on land, and designed for dwelling or temporary, permanent, or overnight accommodation.
- The document is a proposed/public-hearing draft with a blank specific effective date.
typical total floorspace excluding lofts: <= 600 square feet (The source says “typically described,” not an absolute dimensional limit.)
““Tiny Home” shall mean any structure (typically described as having a total floorspace, excluding lofts, no larger than 600 square feet) towed on a trailer with wheels or placed on land, and being designed for, used, or intended to be used as a dwelling of a person, or for the temporary, permanent, or overnight accommodation or lodging of a person -- but specifically excluding a Manufactured Home defined by these Regulations.”
Irion County, Texas — Proposed 2025 Subdivision/MHRC Regulations ↗Re-checked Sep 11, 2026
Manufactured homesLimited
Manufactured Home Rental Communities in unincorporated Irion County.
- The MHRC must be located in the unincorporated area of the county.
- A completed infrastructure development plan and required application materials must be submitted.
- Construction and occupancy may not begin before the County approves the infrastructure development plan.
- The plan must address drainage, water, sewer/septic/OSSF, survey, and roads.
- The document leaves the specific 2025 effective date blank and is labeled proposed/public-hearing draft.
“The Regulations contain standards, requirements, provisions, and procedure for subdivision plats and MHRCs in the unincorporated area of the county relating, among other things, to: [...] MHRC infrastructure development plan standards, requirements, and procedure, including restrictions on MHRC construction and occupancy unless approved by the County;”
Irion County, Texas — Proposed 2025 Subdivision/MHRC Regulations ↗Re-checked Sep 11, 2026
Accessory dwellings · by state lawNo county rule
Unincorporated Irion County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Irion County has no zoning ordinance. The county legal census found no county zoning ordinance, citing newtools.cira.state.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Subdividing landRegulated (with conditions)
Plats and subdivisions of land in the unincorporated area of Irion County, Texas.
- The regulations were approved, adopted, and enacted by the Irion County Commissioners Court at a public meeting on June 24, 2025.
- Subdivision plat procedure and review apply, including recordation, exceptions or exemptions, variances, revisions, vacations, amendments, and subdivision regulation in the extraterritorial jurisdiction of an incorporated municipality.
- The regulations include development, design, construction, water, sewer, septic, OSSF, utility, drainage, transportation, floodplain, road, lot-frontage, and building/set-back-line requirements, as applicable.
- Compliance with applicable federal law, state law, and County regulations is required.
- A fee schedule and related procedure apply.
“The Regulations are designed to govern plats, subdivisions of land, and manufactured home rental communities (“MHRCs”) in the unincorporated area of Irion County, Texas”
Approval of 2025 Subdivision/Manufactured Home Rental Community Regulations ↗Re-checked Sep 24, 2026
Building in a floodplainRequired
Subdivision and manufactured home rental community development containing designated floodplain land in unincorporated Irion County.
- The floodplain requirements apply when the proposed development area contains land designated as a floodplain.
- The plat or plan must depict all floodplain, flood-zone, and floodway locations.
- Any structure constructed in the floodplain must have a finished-floor elevation at least one foot above base flood elevation.
- The structure must also comply with the NFIP, state law, and the County's active flood-damage-prevention order or other floodplain-management regulations.
minimum finished-floor elevation above base flood elevation: >= 1 foot
“minimum of 1 foot above the base flood elevation”
Irion County, Texas -- Proposed 2025 Subdivision/MHRC Regulations ↗Re-checked Sep 11, 2026
County-wide zoningAbsent
Texas counties cannot adopt zoning in unincorporated areas; Irion County regulates only subdivision platting and related water/sewer/OSSF disclosures, not land-use zoning.
Irion County Subdivision/MHRC Regulations ↗Scouted from the county site, not yet independently re-checked

Texas rules that apply here

Building code adoptedPartial
Industrialized housing and buildings, modules, and modular components governed by the Texas Industrialized Housing and Buildings program.
- The mandatory state code adoption applies to industrialized housing and buildings, modules, and modular components, not all construction statewide.
- The effective date is July 1, 2024.
- The International Existing Building Code applies to alterations of portable industrialized buildings.
- Manufacturers already certified for Texas must have design-package documents reviewed and approved to the new editions with an approval date on or after July 1, 2024, unless the manufacturer elected to transition before the effective date under Department rule 70.70(a)(5)(B).
- Construction begun on or after July 1, 2024 must comply with the new code editions and approved design packages.
- Construction begun before July 1, 2024, or before a manufacturer's effective transition date, must meet the stated completion, inspection, and labeling deadline to remain eligible for a Texas decal.
effective date: 2024-07-01 · International Building Code: 2021 Edition (including appendices C, F, and K) · International Residential Code: 2021 Edition (including appendices AG, AH, AK, AP, AQ, and AT) · International Fuel Gas Code: 2021 Edition · International Mechanical Code: 2021 Edition · International Plumbing Code: 2021 Edition · International Energy Conservation Code: 2015 Edition · National Electrical Code: 2020 Edition · International Existing Building Code: 2021 Edition (for alterations of portable industrialized buildings)
“July 1, 2024, all industrialized housing and buildings, modules, and modular components shall comply with the following codes, as amended in §70.101 of the IHB Rules:”
Industrialized Housing and Buildings – Adoption of New Code Editions ↗Re-checked Sep 12, 2026
Who permits septicMixed
On-site sewage facilities, including septic systems, throughout Texas
- In most areas, local governments act as TCEQ-authorized agents and administer the OSSF program.
- The TCEQ regional office is the permitting authority where a local jurisdiction has not been authorized.
- Local permitting programs may be more stringent than state minimums.
“TCEQ is not often the OSSF permitting authority. [...] The TCEQ regional office will be the permitting authority in locations where a local jurisdiction has not been authorized.”
Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Sep 12, 2026
Septic permitRequired
Construction, installation, alteration, extension, or repair of an OSSF in Texas
- A permit and approved plan are required to construct, alter, repair, extend, and operate an OSSF.
- A 10-acre exemption may apply only if all listed conditions are met: site evaluation by a TCEQ-licensed site evaluator or professional engineer; single-family dwelling on at least 10 acres; no nuisance or groundwater pollution; all OSSF parts at least 100 feet from the property line; effluent disposed of on the property; and the single-family dwelling is the only dwelling on the tract.
- Emergency repairs listed by TCEQ do not require a permit but must be reported in writing to the permitting authority within 72 hours after repairs begin.
- Grandfathered systems may also be exempt if the stated conditions are met.
minimum tract size for 10-acre exemption: >= 10 acres (single-family dwelling and all other TCEQ conditions must be met) · minimum OSSF distance from property line for 10-acre exemption: >= 100 feet (all parts of the OSSF) · emergency repair reporting deadline: <= 72 hours (after repairs have begun; written report to permitting authority)
“A permit is required to construct, install, alter, extend, or repair an OSSF. [...] An OSSF may be exempt from permitting if it complies with all other requirements, including planning, construction, and installation standards of 30 TAC 285 AND meets the “10 acre rule”:”
Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Sep 12, 2026
Septic inspectionLimited
OSSF installation and, where applicable, maintenance inspections in Texas
- Authorized agents or their designated representatives inspect system installation.
- Some permitting authorities impose more stringent requirements.
- Maintenance-provider inspection and reporting requirements apply to systems and circumstances governed by 30 TAC §285.91(4).
- Electronic monitoring may reduce reporting to every six months where the stated monitoring conditions apply.
reduced maintenance reporting interval with qualifying electronic monitoring: 6 months (only where the system uses the specified electronic monitoring, automatic notification, and disinfection monitoring)
“Many times, the AA has a "designated representative" (DR) to assist them with their responsibilities, which include reviewing plans for constructing, altering, extending or repairing each OSSF; issuing permits; and inspecting system installation. [...] If the system uses an electronic monitor, automatic radio or telephone to notify the maintenance provider of system or component failure and to monitor the amount of disinfection in the system, reporting may be reduced to every six months.”
Basics for Septic Systems ↗Re-checked Sep 12, 2026
Driveway accessRequired
New or modified access driveways connecting property to a Texas state highway right of way.
- A local public agency may receive access driveway permitting authority for state highways, but TxDOT approval remains required for drainage impacts on the state highway system before local approval.
- No access driveway is permitted within a flared or widened right-of-way section at an intersection of a state highway with another highway, road, or street.
- All entrances and exits, including radii, must be confined within the permittee's property frontage.
- One-way 45-to-90-degree driveways are permitted for connections to one-way frontage roads or lane-divided highways; otherwise the driveway angle must be 75 to 90 degrees.
- ADAAG and Texas Accessibility Standards apply.
private residential driveway maximum width: <= 24 feet (Except as increased by permissible radii.) · driveway-to-pavement radius: >= 15 feet
“A driveway must be constructed in accordance with a fully executed driveway permit”
Section 4: Driveway Permits, Design, and Materials ↗Re-checked Sep 12, 2026
Permit processPublished (with conditions)
Constructing a new driveway or revising an existing driveway on the right of way of a Texas state highway.
- The applicant should contact the local District TxDOT office.
- The applicant must submit Form 1058, Permit to Construct Access Driveway Facilities on Highway Right of Way.
- The application must be for the bona fide purpose of securing or changing access to the owner's property, not parking or servicing vehicles on state highway rights of way.
- No construction may begin on the right of way until a fully executed driveway permit is received and the applicant gives TxDOT 24-hour notification.
- The driveway must comply with the executed permit and applicable regulations; TxDOT inspection must find construction satisfactory.
- Where a local public agency has permitting authority, drainage impacts on the state highway system still require TxDOT approval before local approval.
- Driveway geometrics, utilities, environmental requirements, wetlands considerations, ADAAG, TAS, and other applicable state and federal laws must be considered.
required form: Form 1058, Permit to Construct Access Driveway Facilities on Highway Right of Way · advance notification: 24 hours (Notification to TxDOT is required before construction on the right of way.) · private residential driveway maximum width: <= 24 feet (Except as increased by permissible radii.) · minimum driveway radius to highway pavement: >= 15 feet
“The applicant shall complete and submit to TxDOT a Form 1058”
Section 4: Driveway Permits, Design, and Materials ↗Re-checked Sep 12, 2026
county zoning authorityLimited
Texas counties adopting zoning regulations for specified unincorporated or otherwise specially defined areas.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
- Other Chapter 231 subchapters address special areas including the Amistad Recreation Area in Val Verde County, military zones, certain lakes, the El Paso Mission Trail Historical Area, Lake Somerville, and Falcon Lake in Zapata County.
- The cited statute was enacted effective September 1, 1987; the Falcon Lake subchapter was added effective June 15, 2007, and amended effective September 1, 2009.
Padre Island distance from publicly owned park or recreational development: <= 2 miles (Area must be outside a municipality and in Cameron or Willacy County.) · Padre Island distance from beach, wharf, or bathhouse: <= 2 miles (The beach, wharf, or bathhouse must be used by at least 500 persons annually.)
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
county building authorityLimited
Texas counties adopting and enforcing fire-code building permits for specified buildings in unincorporated areas and applying residential building-code standards in certain counties.
- Under Section 233.061, the county must have a population over 250,000 or be adjacent to a county with a population over 250,000.
- Under Section 233.062, the fire code applies only to commercial establishments, public buildings, and multifamily residential dwellings consisting of four or more units constructed in an unincorporated area.
- The fire code does not apply to an industrial facility having a fire brigade that conforms to Occupational Health and Safety Administration requirements.
- A covered applicant must submit a plan and a commissioners-court-set application fee; the county must issue or deny the permit within 30 days, and failure to act within 30 days approves the construction for purposes of the subchapter.
- The fire code must conform to the International Fire Code or Uniform Fire Code as those codes existed on May 1, 2005, or establish protective measures exceeding those standards; later editions may be adopted.
- Residential standards under Section 233.152 apply only if the county adopts a resolution or order and the county is within 50 miles of an international border or has a population over 100.
- Those residential standards apply only to new single-family-house or duplex construction beginning after September 1, 2009; manufactured or modular structures governed by Occupations Code Chapters 1201 or 1202 are excluded from the definition of new residential construction.
- A municipality's building code controls in its extraterritorial jurisdiction, and Section 233.152 does not authorize county prior approval of new residential construction or county zoning regulations.
- Fire-code inspection and permit fees may be charged under a fee schedule based on building type, limited to amounts necessary to administer and enforce the subchapter; inspection fees must be reasonable and reflect approximate inspection costs.
county population threshold for fire-code authority: > 250000 persons (A county adjacent to a county over 250,000 also qualifies.) · multifamily residential dwelling threshold: >= 4 units (The fire code applies only to covered buildings constructed in an unincorporated area.) · residential-code border distance: <= 50 miles (Alternative qualification is county population over 100.) · application decision period: 30 days (If the commissioners court does not issue or deny the permit within 30 days after receiving the application and fee, construction is approved for purposes of the subchapter.) · residential standards effective construction date: > 2009-09-01 (Applies only to new residential construction that begins after September 1, 2009.)
“The commissioners court of a county with a population of over 250,000 or a county adjacent to a county with a population of over 250,000 may adopt a fire code and rules necessary to administer and enforce the fire code. [...] The fire code applies only to the following buildings constructed in an unincorporated area of the county: (1) a commercial establishment; (2) a public building; and (3) a multifamily residential dwelling consisting of four or more units.”
Local Government Code Chapter 233, County Regulation of Housing and Other Structures ↗Re-checked Sep 21, 2026

Still unanswered

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

Owner-builder exemption — Owner-builder exemptions from building-permit, inspection, or occupancy requirements in Irion County.
Certificate of occupancy — Certificates of occupancy for buildings in Irion County.
Local zoning — Aggregate local zoning status across Irion County, including incorporated municipalities and unincorporated areas; this claim does not attribute municipal ordinances to the county.
Agricultural exemption — Agricultural exemptions from Irion County subdivision or other requested development controls in unincorporated Irion County.
Short-term rentals — Short-term rental use in unincorporated Irion County.

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 Irion County, Texas

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

Irion County scores 42/100 on the Bolthole Index, a marginal county profile. Its strengths: deep seclusion — about 1,117 people within 15 miles and manageable long-term carry cost. Watch-outs: thin water margin (20.6″/yr rainfall) and elevated mid-century heat, water, rain, or wildfire exposure.

Do you need a building permit in Irion County, Texas?

Irion 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 Texas Commission on Environmental Quality (TCEQ) - On-Site Sewage Facilities program. 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.

How much does land cost in Irion County, Texas?

Land in Irion County runs about $1,345 per acre, based on the latest county data.

What is the water situation in Irion County?

Irion County gets about 20.6" of rain a year, with severe drought in roughly 18% of years.

How remote is Irion County?

A typical private-land location has about 1,117 people within 15 miles and 514,236 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Building permits, zoning and land-development rules in Irion County, Texas

At a glance

Who to call

Do you need a building permit in Irion County, Texas?

Who handles subdivision, MHRC and septic questions in Irion County, and how do you reach them?

Does Irion County have zoning?

How do septic (OSSF) permits work in Irion County?

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

Building on land in Irion County: the steps, in order

What to check before you buy land in Irion County, Texas

Watch-outs

Sources

Irion County in Texas

How Irion County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Irion County

Irion County rules

Texas rules that apply here

Still unanswered

Living off-grid in Irion County, Texas

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

Do you need a building permit in Irion County, Texas?

How much does land cost in Irion County, Texas?

What is the water situation in Irion County?

How remote is Irion County?

How Irion compares in Texas