Duval County, TX Building Permits, Zoning & Septic

Unincorporated Duval County, Texas does not require a county building permit for a home, barn or shed, and the county has no zoning ordinance¹². Because Texas gives counties no general zoning power here, Duval County also sets no county rule on setbacks, lot size, building height, accessory dwelling units, RVs, tiny homes or manufactured homes on unincorporated land³. Duval County is itself TCEQ's authorized agent for septic (OSSF) permits in the unincorporated county, and a property owner may personally install their own OSSF, subject to permit and inspection⁴⁵. Start with a 9-1-1 address and the County Judge's office to find the right department, since Duval County lists no separate building, zoning or environmental department on its own website⁶⁷.

At a glance

Building permit: Not required in unincorporated Duval County¹
Zoning: No county zoning; Texas gives counties no general zoning power here²
Setbacks, lot size & building height: No county rule set on any of these³
RV, tiny home & manufactured home living: Not restricted by county zoning (Duval County has none)³
Accessory dwelling units: Not restricted by county zoning³
Septic permits: Duval County is TCEQ's own authorized agent; owner-installation allowed with permit⁴⁵
Well permits: Operating permit required for non-exempt wells in the county's groundwater district⁸
State-highway driveway permit: Required from TxDOT (Form 1058) before connecting to a state highway⁹¹⁰

Who to call

Also useful

Duval County 9-1-1 Addressing

Assigns the official 9-1-1 address every new home or structure needs before emergency responders, mail and most utility or septic hookups can use it

(361) 279-6375

401 E. Gravis, San Diego, TX 78384

Also useful

Duval County Judge's Office

General county contact point; the practical starting place for septic (OSSF), building, zoning, floodplain and road questions since Duval County lists no separate department for any of them

(361) 279-6208

Duval County Courthouse, 400 E Gravis, San Diego, TX 78384

Roads & driveways

Duval County Commissioners Court

County road, right-of-way and driveway/entrance matters on county roads, handled through the Commissioners Court and the elected commissioner and road shop for each of the county's four precincts

(361) 279-6208

Duval County Courthouse, 400 E Gravis, San Diego, TX 78384

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 Duval County, Texas?

Unincorporated Duval County, Texas does not require a county building permit for a house, barn or shed¹. Texas counties only get building-permit authority from specific state statutes, and the fire-code option under Local Government Code Chapter 233 only opens once a county's population passes 250,000 or the county borders one that has; Duval County's population is about 9,604, far under that threshold¹¹¹². A separate residential-construction-standards option exists under the same chapter, but only if a county's commissioners court adopts a resolution opting in, and we found no evidence Duval County has done that¹¹. Manufactured and industrialized housing still carries its own state-level manufacturing rules that apply no matter which county you buy in, separate from anything Duval County itself regulates¹³. None of this waives Texas's separate septic and state-highway-driveway rules, covered below⁴⁹.

Who handles septic, addressing and road questions in Duval County?

Duval County's official website lists no building, zoning, planning or dedicated environmental department¹². Duval County is itself TCEQ's authorized agent for septic (OSSF) permits in the unincorporated county, but the county's own website does not name a separate septic or environmental office, so the practical starting point is the County Judge's office, which can direct you to the right department⁴⁷. Before you build, get your official 9-1-1 address assigned through the county's 9-1-1 Addressing office, since emergency responders, mail and most utility or septic hookups depend on it⁶. Road, right-of-way and driveway matters on county roads run through the Commissioners Court and the elected commissioner and road shop for each of the county's four precincts¹⁴. For a driveway onto a state highway instead of a county road, contact the local TxDOT district office directly⁹.

Does Duval County have zoning?

Duval County has no zoning ordinance for its unincorporated area, and Texas law gives counties zoning power only for specific, narrowly defined situations that do not include ordinary rural land in Duval County²³. Because the county has no zoning authority here, it sets no rule on minimum dwelling size, minimum lot size, setbacks, lot coverage or building height, and it does not restrict accessory dwelling units, RVs, tiny homes, manufactured homes or temporary camping on unincorporated land³. This is genuinely unrestricted, not merely unconfirmed, because it follows from the limits Texas law places on county power, not from a gap in county recordkeeping³. Manufactured and industrialized housing still has to be built at the factory to Texas's state-adopted code editions, a rule that took effect in 2024 and is separate from any county land-use restriction¹³.

How do septic permits work in Duval County?

Duval County itself is TCEQ's authorized agent for septic (OSSF) permits in the unincorporated county; outside that area, TCEQ's Region 16 office in Laredo is the permitting authority instead⁴. Texas requires a permit to construct, install, alter, extend or repair an OSSF anywhere in the state, including Duval County, unless a specific exemption applies¹⁵. The exemption that matters most for rural buyers is the 10-acre rule: it can apply only if a TCEQ-licensed site evaluator or engineer confirms the tract is at least 10 acres, the home is the only dwelling on it, every part of the system sits at least 100 feet from the property line, effluent stays on the property, and the system causes no nuisance or groundwater pollution¹⁵. About 42.1% of Duval County's soils are free of severe limitations for a conventional septic drain field, notably better than many rural Texas counties, though a site evaluation is still the way to confirm your specific parcel¹⁶. Under TCEQ rules, a property owner may personally install an OSSF serving their own single-family home, subject to the same permit and inspection requirements as a licensed installer⁵.

Can you live in an RV, tiny home or manufactured home on your land in Duval County?

Duval County has no zoning ordinance and no zoning authority over unincorporated land, so it does not restrict living in an RV, a tiny home or a manufactured home there, and it does not set a minimum dwelling size³². This follows directly from Texas law giving counties zoning power only in specific situations that do not apply here, not from an absence of research; it is a real answer, not an open question³. A manufactured or industrialized home you place still has to be built at the factory to Texas's state-adopted code editions, a requirement that took effect in 2024 and is separate from any county land-use restriction¹³. Whatever you live in, get a 9-1-1 address assigned and plan your septic system through Duval County's own OSSF authority; those are the practical steps that actually gate rural living here, not zoning⁶⁴. If you plan to drill a well, check the Duval County Groundwater Conservation District's rules first; a non-exempt well needs an operating permit regardless of how you live on the land⁸.

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

Get your official 9-1-1 address assigned through Duval County's 9-1-1 Addressing office before you do much else; emergency responders, mail and most hookups depend on it⁶.
Call the County Judge's office to confirm which county department to work with, since Duval County lists no separate building, zoning or environmental office on its website⁷.
Start OSSF (septic) planning early with Duval County's own authorized-agent program; about 42.1% of the county's soils are free of severe septic limitations, so a site evaluation will tell you where you stand⁴¹⁶.
If your tract is 10 acres or more and will hold a single dwelling, ask about the state's 10-acre exemption from OSSF permitting before you assume you need a full permit¹⁵.
If you plan to drill a well, check with the Duval County Groundwater Conservation District; a non-exempt well needs an operating permit, and a proposed well must be registered and drilled within 180 days of approval or the registration becomes void⁸.
If your new driveway will connect to a state highway, contact the local TxDOT district office and submit Form 1058 before starting any work on the right of way⁹¹⁰.
If it will connect to a county road instead, call the Duval County Commissioners Court to be directed to your precinct's road shop¹⁴.

What to check before you buy land in Duval County

Duval County sits about 60 miles from the nearest metro area with roughly 5.4 people per square mile, so this is genuinely remote South Texas ranch country¹⁷¹⁸. About 33.4% of the county is wooded and 99.9% of land sits at 15% slope or less, which favors building sites and driveways almost everywhere¹⁹²⁰. Septic looks better here than in many rural Texas counties: about 42.1% of Duval County's soils are free of severe limitations for a conventional septic drain field, and the county issues its own OSSF permits rather than routing through a distant TCEQ regional office¹⁶⁴. If you plan to drill a well, check the Duval County Groundwater Conservation District first; a non-exempt well needs an operating permit and must generally sit at least 100 feet from the property line⁸. Typical property taxes here run about 1.1% of value, with a median annual bill near $931, and a typical home insurance premium runs about $1,979 a year²¹²²²³. Ask the County Judge's office about floodplain risk directly if your parcel is near a creek or drainage; the county has managed at least one federally-reviewed drainage project sited in a floodplain, so flood risk is a real consideration in parts of the county even though no general county floodplain-development rule was confirmed during this research⁷²⁴.

Watch-outs

Duval County's no-permit, no-zoning answer rests on the absence of a building or zoning department on the county's own website, not on a specific ordinance we could read; call the County Judge's office to confirm before you buy²¹.
We could not confirm a Duval County certificate-of-occupancy rule, short-term-rental rule, or a general countywide public-water/sewer connection requirement; each is genuinely unconfirmed rather than absent, so ask the County Judge's office about your specific parcel⁷.
A driveway permit is confirmed only for connections onto the Texas state highway system through TxDOT; for a driveway onto a county road, contact the Commissioners Court and your precinct's road shop instead⁹.

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 Duval County scores

Seclusion83100% ev.

Self-Sufficiency2996% ev.

Admin Boringness86100% ev.

Durability33100% ev.

Property Autonomy71100% ev.

Carry Cost81100% ev.

Evidence strength: 99%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$84kTypical home

1.1%Property tax

$1,532Land / acre

24"Annual rain

21.8% of yrsSevere drought

63.2 / yr (+40.8)Mid-century 100°F days

34.1 daysMid-century dry spell

2.15" (+7.2%)Mid-century 1-day rain

1.35×Wildfire change factor

100%Forward climate coverage

$1,979Home insurance / yr

0% / yrInsurance growth

0%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

1,991People within 30 min

834,396People within 2 hr

4,463Radius comparison (15 mi)

5.4People / sq mi

0%Federal land

99.9%Land at 15% slope or less

42.1%Septic soil without severe limits

478,971 acWorkable land screen

33.4%Wooded land

3.6 tonsBiomass / forest ac

72.7°FAvg temp

Answers from the rulebook for Duval County

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

Duval County rules

Zoning districts · by state lawNo county rule
Unincorporated Duval County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Duval County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.duval.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 Duval County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Duval County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.duval.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 Duval County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Duval County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.duval.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 Duval County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Duval County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.duval.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 Duval County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Duval County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.duval.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 Duval County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Duval County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.duval.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 RV · by state lawNo county rule
Unincorporated Duval County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Duval County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.duval.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
Camping on your land · by state lawNo county rule
Unincorporated Duval County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Duval County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.duval.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
Tiny homes · by state lawNo county rule
Unincorporated Duval County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Duval County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.duval.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
Manufactured homes · by state lawNo county rule
Unincorporated Duval County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Duval County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.duval.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
Accessory dwellings · by state lawNo county rule
Unincorporated Duval County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Duval County has no zoning ordinance. The county legal census found no county zoning ordinance, citing co.duval.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
Well permitLimited
Proposed and existing non-exempt groundwater wells within the jurisdiction of the Duval County Groundwater Conservation District.
- All non-exempt wells require an operating permit.
- A proposed non-exempt well may not be drilled, operated, or produce water unless the operating permit has been obtained.
- Proposed wells must be registered and satisfy applicable spacing requirements or obtain an approved variance or waiver.
- If no operating permit is required, approved registration and the Well Registration Certificate authorize drilling and operating as described in the registration.
- A registration becomes void if the well has not been drilled within 180 days after approval and issuance of the certificate.
- An existing non-exempt well must have an operating-permit application submitted within 90 days after District approval of the registration application.
registration validity period: 180 days (if the proposed well has not been drilled, registration and certificate become void) · existing non-exempt well operating-permit application deadline: <= 90 days (after District approval of registration application) · minimum proposed-well distance from property line: >= 100 feet (unless a more stringent applicable requirement or approved variance applies)
“Operating Permits are required for all Non-Exempt Wells. This requirement applies to Proposed and Existing Wells.”
Duval County Groundwater Conservation District Management Plan 2023 ↗Re-checked Sep 11, 2026
Building in a floodplainLimited
The Duval County Community Development Block Grant sewer and drainage improvements project identified as ERR CFC24-0103, including work near Cadena Loop and specified lift stations, where the County determined the proposed action is in the FFRMS floodplain.
- The project is administered under the Community Development Block Grant Program by the Texas Department of Agriculture.
- Duval County will identify and evaluate practicable alternatives to locating the action in the floodplain and potential impacts on the floodplain.
- The notice states that the process is required by Executive Order 11988, as amended by Executive Order 13690, and HUD regulations at 24 CFR 55.20 Subpart C.
- The FEMA FIRM panels identified for the project are 48131C0425C and 48131C0600C, effective February 4, 2011.
- The proposed project affects approximately 0.28 acres of the FFRMS floodplain.
- Written comments were due by February 13, 2026.
affected FFRMS floodplain area: 0.28 acres · FIRM effective date: 2011-02-04 · public-comment deadline: 2026-02-13
“According to FEMA, Flood Insurance Rate Map (FIRM) Panels No. 48131C0425C and 48131C0600C effective February 4, 2011, the proposed project is within approximately .28 acres of the FFRMS Floodplain.”
Early Notice and Public Review of a Proposed Activity in a Federal Flood Risk Management Standard Designated Floodplain ↗Re-checked Sep 11, 2026
Permit feesPublished (with conditions)
Duval County tax-abatement applications for creation of a reinvestment zone or tax abatement.
- The fee is for a tax-abatement application, not a general building or development permit.
- The application fee is non-refundable.
- Additional reasonable professional service and consulting fees may be required as a condition precedent to execution of the abatement agreement.
- The County may request additional information or data from the applicant.
application fee: 1000 USD (non-refundable) · professional service and consulting fees: variable USD (determined during negotiation and payable as a condition precedent to execution of the tax-abatement agreement)
“8. A $1,000.00 non-refundable application fee.”
Tax Abatement Guidelines and Criteria as Amended ↗Re-checked Sep 11, 2026
Building permitNot required
Duval County's official department list includes no building/permitting or planning department; as a Texas county it has no general building code authority in unincorporated areas.
Duval County, Texas - Official County Website ↗Scouted from the county site, not yet independently re-checked
County-wide zoningAbsent
Texas counties lack general zoning authority in unincorporated areas and Duval County lists no planning/zoning department.
Duval County, Texas - Official County Website ↗Scouted from the county site, not yet independently re-checked
Owner-builder exemptionAvailable
Under TCEQ rules a property owner may install an on-site sewage facility to serve their own single-family residence, subject to permit and inspection.
TCEQ - OSSF Information for Homeowners ↗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.

Inspections — General building inspections for construction in Duval County, including unincorporated areas.
Certificate of occupancy — Certificate-of-occupancy requirements for buildings in Duval County, including unincorporated areas.
Local zoning — Zoning in incorporated municipalities and other local jurisdictions within Duval County.
Mandatory utility hookup — Connection to public water or sewer systems for property in Duval County.
Short-term rentals — Short-term rentals in Duval 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.

Living off-grid in Duval County, Texas

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

Duval County scores 59/100 on the Bolthole Index, a solid county profile. Its strengths: low administrative friction for a quiet rural property and sparse surroundings — about 1,991 people within a 30-minute drive. Watch-outs: thin water margin (24″/yr rainfall) and elevated mid-century heat, water, rain, or wildfire exposure.

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

Duval 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 Duval County (TCEQ authorized agent for on-site sewage). 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 Duval County?

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

How much does land cost in Duval County, Texas?

Land in Duval County runs about $1,532 per acre, based on the latest county data.

What is the water situation in Duval County?

Duval County gets about 24" of rain a year, with severe drought in roughly 21.8% of years.

How remote is Duval County?

A representative private-land location has about 1,991 people within a 30-minute drive and 834,396 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 Duval County, Texas

At a glance

Who to call

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

Who handles septic, addressing and road questions in Duval County?

Does Duval County have zoning?

How do septic permits work in Duval County?

Can you live in an RV, tiny home or manufactured home on your land in Duval County?

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

What to check before you buy land in Duval County

Watch-outs

Sources

Duval County in Texas

How Duval County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Duval County

Duval County rules

Texas rules that apply here

Still unanswered

Living off-grid in Duval County, Texas

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

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

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

How much does land cost in Duval County, Texas?

What is the water situation in Duval County?

How remote is Duval County?

How Duval compares in Texas