Coryell County, TX Building Permits & Septic Rules

Unincorporated Coryell County, Texas does not require a building permit for a home, and the county has no zoning ordinance¹². That leaves no county-set minimum dwelling size, lot size, or RV/tiny-home restriction on unincorporated land³, but every septic system still needs a permit from the county's own OSSF Office, regardless of tract size, unless it was grandfathered in before 1989⁴.

At a glance

Building permit: Not required in unincorporated areas¹
Zoning: No county zoning ordinance²
Septic permits: Coryell County OSSF Office; required for all systems regardless of tract size⁴
RV / tiny home / manufactured home on your land: No county zoning restriction, because the county has no zoning ordinance³
Minimum lot size: No county rule; the county has no zoning authority in place³
Owner-builder (industrialized housing): Available via TDLR's Residential Installation Permit for a homeowner installing their own industrialized home⁵
Subdivision lots fronting a TxDOT road: 50-foot minimum building setback where no interior street is feasible⁶

Who to call

Also useful

Coryell County Judge / Commissioners Court

General Coryell County government contact; the Commissioners Court sets county policy, since there is no separate building or zoning department

(254) 865-5911

620 E Main St, Gatesville, TX 76528

Septic permits

Coryell County OSSF Office (County Septic / OSSF Representative)

Permits and inspects all on-site sewage facility (OSSF/septic) construction, alteration, extension, or repair countywide, regardless of tract size; also handles floodplain development-permit applications

254-213-6601

Contact details are copied from each office’s official page and were checked against it on September 24, 2026.

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

No. Unincorporated Coryell County does not require a building permit to build a home¹. Texas counties generally have no statewide grant of building-permit authority over unincorporated land; the narrow exception is limited to counties over 250,000 people (or adjacent to one) adopting a fire code that covers only commercial buildings, public buildings, and multifamily dwellings of four or more units -- not ordinary single-family homes, and not Coryell County, which is below that population threshold⁷. This changes inside Gatesville, which has adopted the 2021 International Residential, Building, and Fire Codes along with the 2020 National Electric Code and administers its own building permits and inspections -- but only within city limits, not on unincorporated county land⁸.

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

For general county government questions -- and for anything not covered by a specific department -- contact the County Judge / Commissioners Court at the Coryell County Courthouse, 620 E Main St, Gatesville, TX 76528, phone (254) 865-5911⁹. For septic (OSSF) permits, inspections, and floodplain development-permit applications, contact the County OSSF Office at 254-213-6601¹⁰. If you're building industrialized (manufactured/modular) housing and doing your own installation work, you'll separately need a Residential Installation Permit from the Texas Department of Licensing and Regulation (TDLR), which is a state permit, not a county one⁵.

Does Coryell County have zoning?

No. Coryell County has no countywide zoning ordinance for unincorporated land², and Texas law grants counties zoning power only for specific, narrowly defined areas -- Padre Island in Cameron or Willacy County, the Amistad Recreation Area, certain lakes, and a handful of other named places -- none of which include Coryell County¹¹. Because of that, unincorporated Coryell County has no county-set minimum dwelling size, minimum lot size, lot-coverage, or building-height rule, and no county restriction on RVs, tiny homes, manufactured homes, accessory dwellings, or temporary camping on your own land³. One exception applies inside county-approved subdivisions: residential lots fronting an existing TxDOT-maintained road are generally discouraged, and where no interior street is feasible, the county requires a 50-foot minimum building setback and at least 250 feet between driveway openings, with TxDOT approving the actual driveway location⁶. That's a subdivision-platting rule, not general zoning, and it doesn't apply outside a platted subdivision. This all changes inside Gatesville or another incorporated town, which sets its own rules within city limits.

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

Every on-site sewage facility in Coryell County needs a permit from the county's own OSSF Office, regardless of the size of the tract, unless the system was grandfathered in by being installed before 1989⁴. That's stricter than the statewide default, where Texas's 10-acre exemption can let a system skip permitting entirely if it meets all the state's conditions -- Coryell County's own rule requires a permit for all systems here, so don't assume the 10-acre exemption applies on unincorporated Coryell County land¹²¹⁰. The OSSF Office also handles floodplain issues and processes Development Permit Applications¹⁰.

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

Yes, as far as county zoning is concerned: because Coryell County has no zoning ordinance, there's no county rule restricting RV, tiny-home, or manufactured-home occupancy on unincorporated land³. That covers land use, not utilities: any wastewater system on the property still needs an OSSF permit from the county's OSSF Office regardless of tract size, since Coryell County doesn't follow the state's 10-acre permitting exemption⁴¹⁰¹². If you're placing an industrialized or manufactured home and installing it yourself, you'll also need TDLR's Residential Installation Permit as the homeowner⁵.

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

Confirm your parcel is truly unincorporated and outside Gatesville or another municipality, since city rules don't apply outside city limits but do apply inside them.
Apply for an OSSF permit through the County OSSF Office before installing septic -- every system needs one here, regardless of tract size¹⁰⁴.
If you're installing industrialized or manufactured housing yourself, file a Residential Installation Permit application with TDLR and pay the $75 non-refundable registration fee before starting installation-related construction¹³.
If your industrialized home is its first installation, arrange for the required site inspections -- foundation, set, and final -- with a Council-approved inspector, and get the final inspection done within 180 days of starting construction¹⁴.
If your land is in a county-approved subdivision fronting a TxDOT-maintained road with no feasible interior street, plan for the 50-foot minimum building setback and 250-foot spacing between driveway openings, and get your driveway location approved by TxDOT⁶.

What to check before you buy land in Coryell County

Water and soils deserve close attention here: Coryell County gets about 35 inches of rain a year but sits in severe drought roughly 31% of years, and only about 9% of its soils have no severe limits for a conventional septic drain field, so budget for a site evaluation and possibly an engineered system¹⁵¹⁶¹⁷. The land is mostly gentle, with 92% at 15% slope or less, and moderately wooded at about 28% forest cover, but nearly 23% of the county is federal land, so confirm your parcel isn't landlocked by it¹⁸¹⁹²⁰. This is a more populated, less remote county than many in this dataset, with about 81 people per square mile, roughly 84,900 residents, and just 22 miles to the nearest metro area²¹²²²³. Property taxes run a typical effective rate of 1.4% with a median annual bill of $2,509²⁴²⁵. Before closing, confirm septic feasibility with the County OSSF Office, and if you're in a subdivision, confirm any TxDOT-road setback and driveway rules apply to your specific lot¹⁰.

Watch-outs

Coryell County requires an OSSF permit for every septic system regardless of tract size -- don't assume the state's 10-acre exemption gets you out of permitting here, since the county's own rule overrides that default⁴¹².
Coryell County has no zoning ordinance, so there's no county-set minimum lot size or dwelling-size rule -- but that also means there's no county protection against what a neighbor builds next to you³.
If your subdivision lot fronts a TxDOT-maintained road with no interior street option, plan for a 50-foot building setback and TxDOT approval of your driveway location before you assume normal siting is possible⁶.

Sources

Written September 24, 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 Coryell County scores

Seclusion42100% ev.

Self-Sufficiency42100% ev.

Admin Boringness87100% ev.

Durability53100% ev.

Property Autonomy71100% ev.

Carry Cost77100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$228kTypical home

1.4%Property tax

$3,621Land / acre

34.8"Annual rain

30.5% of yrsSevere drought

43.6 / yr (+28.3)Mid-century 100°F days

27 daysMid-century dry spell

2.19" (+5.6%)Mid-century 1-day rain

1.39×Wildfire change factor

100%Forward climate coverage

$1,820Home insurance / yr

2.5% / yrInsurance growth

0%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

23,890People within 30 min

3,720,761People within 2 hr

23,270Radius comparison (15 mi)

80.7People / sq mi

22.7%Federal land

92.1%Land at 15% slope or less

9.3%Septic soil without severe limits

60,731 acWorkable land screen

27.5%Wooded land

16.6 tonsBiomass / forest ac

66.4°FAvg temp

Answers from the rulebook for Coryell County

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

Coryell County rules

Zoning districts · by state lawNo county rule
Unincorporated Coryell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Coryell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing bexar.org.
- 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 Coryell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Coryell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing bexar.org.
- 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 Coryell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Coryell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing bexar.org.
- 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
SetbacksSpecified
Residential lots in Coryell County subdivisions fronting existing roads maintained by TxDOT when no alternative exists to construct an interior street
- Residential lots may not be platted fronting proposed arterials.
- Residential lots fronting existing TxDOT-maintained roads are discouraged and will not be approved unless extenuating circumstances preclude construction of an interior street.
- The 50-foot minimum building setback applies where no alternative exists and lots are platted with at least 250 feet between driveway openings.
- Final approval of driveway locations rests with TxDOT, and some locations may not be approved because of sight distance.
minimum building setback: >= 50 feet (Applies where no alternative exists and the lots maintain a minimum 250 feet between driveway openings.) · minimum distance between driveway openings: >= 250 feet (Applies where no alternative exists for an interior street.)
“minimum building setback shall be established at 50 feet.”
Coryell County Subdivision Regulations and Permitting Requirements ↗Re-checked Sep 11, 2026
Lot coverage · by state lawNo county rule
Unincorporated Coryell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Coryell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing bexar.org.
- 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 Coryell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Coryell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing bexar.org.
- 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 RV · by state lawNo county rule
Unincorporated Coryell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Coryell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing bexar.org.
- 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
Camping on your land · by state lawNo county rule
Unincorporated Coryell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Coryell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing bexar.org.
- 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
Tiny homes · by state lawNo county rule
Unincorporated Coryell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Coryell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing bexar.org.
- 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
Manufactured homes · by state lawNo county rule
Unincorporated Coryell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Coryell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing bexar.org.
- 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
Accessory dwellings · by state lawNo county rule
Unincorporated Coryell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Coryell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing bexar.org.
- 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
County-wide zoningAbsent
Texas counties generally have no zoning authority in unincorporated areas; Coryell County uses subdivision and OSSF rules rather than zoning.
Bexar County, TX - How is my property zoned in the County (Texas law) ↗Scouted from the county site, not yet independently re-checked

Texas rules that apply here

Building permitLimited
Industrialized housing installed in Coryell County and elsewhere in Texas, where the homeowner performs installation-related construction under the Texas Industrialized Housing and Buildings program.
- The homeowner must file the Residential Installation Permit with TDLR.
- The permit applies to industrialized housing or residential modular components and is not the same as a local building permit.
- Local permits remain required where applicable, including within a city or municipality.
registration fee: 75 USD (non-refundable)
“The Residential Installation Permit only allows you, the homeowner, to complete this construction yourself without registering as an industrialized builder. Local permits are still required to be obtained and inspections of the construction will be performed by the local building inspection office (if within the jurisdiction of a city or municipality).”
IHB Residential Installation Permit Application Instructions ↗Re-checked Sep 11, 2026
Owner-builder exemptionAvailable (with conditions)
A homeowner purchasing industrialized housing or residential modular components for the homeowner's own use and responsible for installation-related construction, including in Coryell County.
- The homeowner must apply for the TDLR Residential Installation Permit.
- The homeowner must identify the construction covered by the permit and certify responsibility for that construction.
- The certification must be notarized.
- Construction must comply with mandatory building codes, engineered foundation drawings, engineered unique on-site construction details, and manufacturer-approved installation instructions.
- The homeowner must pay the $75 non-refundable registration fee.
- Local permits and inspections remain applicable where required.
registration fee: 75 USD (non-refundable)
“If you are purchasing the house for your own use (you will live there), then you will need to file an application for a residential installation permit with the Department.”
IHB Residential Installation Permit Application Instructions ↗Re-checked Sep 11, 2026
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
InspectionsRequired
First installation of industrialized housing and permanent industrialized buildings outside a municipality or within a municipality without a building-inspection department, including applicable installations in Coryell County.
- The rule applies to the first installation of all industrialized housing and permanent industrialized buildings.
- Inspections are performed by a Council-approved inspector, including an approved third-party inspector, inspection agency, licensed engineer, or licensed architect.
- Minimum inspection phases include foundation, set inspection, and final inspection.
- The final inspection must be completed within 180 days of the start of construction unless TDLR grants an extension for justifiable cause.
- The source states an exception for unoccupied industrialized buildings not open to the public, such as communication equipment shelters, when not classified as hazardous occupancy.
minimum inspection notice: >= 48 hours · final inspection deadline: <= 180 days (TDLR may grant an extension upon written request demonstrating justifiable cause)
“Site inspections are required for the first installation of all industrialized housing and permanent industrialized buildings. Exception: Site inspections are not required for the installation of unoccupied industrialized buildings not open to the public, such as communication equipment shelters, that are not also classified as a hazardous occupancy by the mandatory building code.”
Building Site Inspection Program ↗Re-checked Sep 11, 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

Inside cities and towns in Coryell County

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

Building code adoptedAdopted (with conditions)
Building-code adoption within the City of Gatesville, a municipality located in Coryell County.
- The cited adoption is municipal and does not establish adoption by Coryell County or applicability in unincorporated areas.
- Building permits and inspections are administered by the City's Building Inspections and Permits Department.
International Residential Code edition: 2021 · National Electric Code edition: 2020 · International Building Code edition: 2021 · International Existing Building Code edition: 2021 · International Fire Code edition: 2021 · International Plumbing Code edition: 2021 · International Mechanical Code edition: 2021
“The City of Gatesville has adopted the following codes: 2021 International Residential Code (IRC) 2020 National Electric Code (NEC) 2021 International Building Code (IBC)”
Building Inspections and Permits ↗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.

Certificate of occupancy — Certificates of occupancy for ordinary residential or commercial construction in Coryell County.
Mandatory utility hookup — Water or sewer utility connection requirements for property in Coryell County.
Short-term rentals — Short-term rental use in Coryell County, Texas.

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 Coryell County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Texas’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 up to a limit

Texas groundwater is governed by the rule of capture; a Groundwater Conservation District must exempt qualifying domestic/livestock wells and may not restrict their production, but well registration and spacing rules can still apply and the exemption does not cover wells serving a platted subdivision.

Limit: Domestic/livestock well exempt from GCD production permitting if on a tract >10 acres AND incapable of producing >25,000 gal/day (Tex. Water Code §36.117)

Texas Water Code §36.117 / TWDB ↗

Central Texas Trinity Aquifer Priority Groundwater Management Areapartial of county
TCEQ-designated Trinity Aquifer critical-groundwater area; drives GCD coverage. Domestic/livestock wells remain exempt but spacing/registration may apply.
TCEQ — Priority Groundwater Management Areas ↗

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 Texas state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Coryell County, Texas

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

Coryell County scores 63/100 on the Bolthole Index, a solid county profile. Its strengths: low administrative friction for a quiet rural property and manageable long-term carry cost. Watch-outs: sparse surroundings — about 23,890 people within a 30-minute drive and workable self-sufficiency basics (34.8″/yr rainfall).

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

Coryell County does not require a county building permit for a home in unincorporated areas, and it has no county-wide zoning. Onsite septic is permitted by Coryell County OSSF Office (TCEQ authorized agent). Owner-builders may act as their own contractor to build their home. 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 Coryell County?

Living in an RV on your own land in Coryell County is allowed: Unincorporated Coryell County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Coryell County has no zoning ordinance. The county legal census found no county zoning ordinance, citing bexar.org. 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. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Coryell County, Texas?

Land in Coryell County runs about $3,621 per acre, based on the latest county data.

What is the water situation in Coryell County?

Coryell County gets about 34.8" of rain a year, with severe drought in roughly 30.5% of years. On water rights, Coryell County lies in the Central Texas Trinity Aquifer Priority Groundwater Management Area — TCEQ-designated Trinity Aquifer critical-groundwater area; drives GCD coverage. Domestic/livestock wells remain exempt but spacing/registration may apply..

How remote is Coryell County?

A representative private-land location has about 23,890 people within a 30-minute drive and 3,720,761 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 Coryell County, Texas

At a glance

Who to call

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

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

Does Coryell County have zoning?

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

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

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

What to check before you buy land in Coryell County

Watch-outs

Sources

Coryell County in Texas

How Coryell County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Coryell County

Coryell County rules

Texas rules that apply here

Inside cities and towns in Coryell County

Still unanswered

Water rights & wells in Coryell County

Living off-grid in Coryell County, Texas

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

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

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

How much does land cost in Coryell County, Texas?

What is the water situation in Coryell County?

How remote is Coryell County?

How Coryell compares in Texas