Martin County, TX Building Permits, Zoning & Septic Rules

Unincorporated Martin County, Texas issues no general building permit and has no zoning ordinance: Texas gives counties only narrow zoning authority, and Martin County has adopted none¹². That means a house, barn, or shed built outside the City of Stanton needs no county permit or zoning sign-off, and RVs, tiny homes, and manufactured homes on your own land aren't restricted by county zoning either³. Septic is different: Martin County runs its own on-site sewage facility (OSSF) program as a TCEQ-authorized agent, and a new residential system permit costs $200⁴⁵.

At a glance

Building permit: Not required outside the City of Stanton¹
County zoning: None; Texas gives counties zoning power only in narrow special cases and Martin County has none²³
RV, tiny home or manufactured home on your own land: Unrestricted by county zoning, since Martin County has none³
Septic permit: Required; Martin County runs its own OSSF program; $200 for a new residential installation⁴⁵
Owner-builder exemption: Not confirmed for Martin County; the county has no building-permit program to exempt yourself from⁶
Driveway onto a county road: Requires a Martin County access permit before construction⁷
Driveway onto a state highway: Needs a separate TxDOT Form 1058 permit⁸

Who to call

Septic permits

Martin County OSSF

Reviews and issues Martin County on-site sewage facility (OSSF) permits and Authorizations to Construct for new, modified, residential, commercial, mobile-home, multifamily, and RV-park systems; administered through the County Judge's office (its listed email matches the Judge's office Administrative Assistant)

[email protected]

P.O. Box 1330, Stanton, TX 79782-1330

Also useful

Martin County Judge

Presides over Commissioners' Court, which decides county road access-driveway permit applications; the office also administers the Martin County OSSF (septic) program

432-607-3535

301 N St. Peter Street, Stanton, TX 79782

Roads & driveways

Martin County Road & Bridge

Maintains Martin County roads and rights-of-way; the office to call about road conditions, though access-driveway permit applications go to Commissioners' Court

432-459-2405

3240 State Highway 176, Lenorah, TX 79749-0055

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 Martin County, Texas?

No. Unincorporated Martin County issues no general residential building permit: Texas counties have only narrow statutory authority over structures outside cities, and Martin County runs no county building-permit program¹. That covers a new house, barn, shop, or shed built on your own unincorporated land; county permits only apply within the City of Stanton¹. Texas does require factory-built industrialized housing and modular components to meet current code editions, including the 2021 IRC/IBC family and 2020 NEC, as of July 1, 2024, but that's a rule for the manufacturer's design package, not a county inspection of a site-built home⁹.

Who handles permits and land-use questions in Martin County?

There's no dedicated building or zoning department in Martin County. Septic (OSSF) applications go to Martin County OSSF, which is administered through the County Judge's office¹⁰. For anything needing Commissioners' Court action, including a driveway access permit, or for general county questions, start with the County Judge's office¹¹. Road and right-of-way matters go through Martin County Road & Bridge¹².

Does Martin County have zoning?

No. Martin County has adopted no zoning ordinance, and Texas law gives counties zoning power only through narrow, geographically specific statutes that don't reach Martin County²³. Because there's no zoning, county rules don't set a minimum home size, minimum lot size, building-height limit, or setback for your own unincorporated land, and accessory dwellings, RVs, tiny homes, manufactured homes, and temporary camping aren't restricted by county zoning³.

How do septic permits work in Martin County?

Martin County runs its own on-site sewage facility (OSSF) program as a TCEQ-authorized agent, so septic applications for new, modified, residential, commercial, mobile-home, multifamily, or RV-park systems go through the county rather than TCEQ directly⁴¹³. A new residential installation permit costs $200, professional design by a registered sanitarian or engineer is required for proprietary and non-standard systems, and construction can't start until the county issues an Authorization to Construct, good for one year from issuance⁵. Before the system is covered, you need an inspection: call the office at least 24 hours ahead, and budget for a re-inspection fee equal to half the permit amount if a re-inspection becomes necessary¹⁴. Statewide, a single-family home on at least 10 acres can qualify for Texas's OSSF permitting exemption instead, but only if it also clears a licensed site evaluation, keeps every part of the system at least 100 feet from the property line, and is the only dwelling on the tract¹⁵. About 75.1% of Martin County's soils are rated free of severe limits for a conventional septic drain field, among the better shares in this guide series¹⁶.

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

Yes. Because Martin County has no zoning ordinance, RVs, tiny homes, and manufactured homes on your own unincorporated land aren't restricted by county zoning³. That's separate from septic: any wastewater system serving an RV, tiny home, or manufactured home still needs its own OSSF permit and Authorization to Construct through Martin County, the same as a conventional house⁵.

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

Confirm your tract is outside the City of Stanton; county rules, not city rules, apply to unincorporated land².
No county building permit is required to start construction on unincorporated Martin County land¹.
Apply for your OSSF (septic) permit before construction: submit the application, technical information sheet, site evaluation, and installer drawing to Martin County OSSF, budget $200 for a new residential installation, and wait for the Authorization to Construct before you break ground¹⁰⁵.
Call the office at least 24 hours before you're ready for your septic inspection, and don't cover the system until it's inspected¹⁴.
If your driveway connects to a Martin County road, apply to the Commissioners' Court or County Judge for an access permit before construction; expect to give 48 hours' notice before work starts⁷¹¹.
If your driveway connects to a state highway instead, file TxDOT Form 1058 with the local TxDOT district office and wait for a fully executed permit before construction⁸.
Reach Martin County Road & Bridge for anything involving county road maintenance or right-of-way work¹².

What to check before you buy land in Martin County

Soils: about 75.1% of Martin County's soils are rated free of severe limits for a conventional septic drain field, among the better shares in this guide series, which should keep septic costs down on most tracts¹⁶. Slope: 100% of the county's land sits at 15% slope or less, flat and easy to build on¹⁷. Drought: the county spends about 36.7% of years in severe drought, worth weighing against well yield before you count on irrigation or livestock water¹⁸. Access: a driveway onto a Martin County road needs a county access permit, and a driveway onto a state highway needs a separate TxDOT Form 1058 permit⁷⁸. Location: Martin County sits about 22 miles from the nearest metro area with a population density around 5.7 people per square mile¹⁹²⁰. Taxes: the effective property tax rate runs about 0.9%, with a median annual bill near $1,434²¹²².

Watch-outs

Martin County has not published an owner-builder exemption, but that's largely moot since the county has no general building-permit program to exempt yourself from in the first place⁶.
The Martin County OSSF program shares its mailing address with the County Judge's office, so if you can't reach septic staff directly, the County Judge's office can point you the right way¹¹.
Unauthorized OSSF construction can trigger civil and administrative penalties, so get your Authorization to Construct before you break ground, not after⁵.

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 Martin County scores

Seclusion60100% ev.

Self-Sufficiency1396% ev.

Admin Boringness8290% ev.

Durability25100% ev.

Property Autonomy71100% ev.

Carry Cost77100% ev.

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

$265kTypical home

0.9%Property tax

$2,051Land / acre

15.8"Annual rain

36.7% of yrsSevere drought

45.7 / yr (+32.5)Mid-century 100°F days

36.6 daysMid-century dry spell

1.31" (+4.4%)Mid-century 1-day rain

1.23×Wildfire change factor

100%Forward climate coverage

$2,525Home insurance / yr

-0.4% / yrInsurance growth

0%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

13,328People within 30 min

973,498People within 2 hr

4,116Radius comparison (15 mi)

5.7People / sq mi

0%Federal land

100%Land at 15% slope or less

75.1%Septic soil without severe limits

438,572 acWorkable land screen

0%Wooded land

0.9 tonsBiomass / forest ac

64.1°FAvg temp

Answers from the rulebook for Martin County

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

Martin County rules

Zoning districts · by state lawNo county rule
Unincorporated Martin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Martin County has no zoning ordinance. The county legal census found no county zoning ordinance, citing guides.sll.texas.gov.
- 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 Martin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Martin County has no zoning ordinance. The county legal census found no county zoning ordinance, citing guides.sll.texas.gov.
- 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 Martin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Martin County has no zoning ordinance. The county legal census found no county zoning ordinance, citing guides.sll.texas.gov.
- 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 Martin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Martin County has no zoning ordinance. The county legal census found no county zoning ordinance, citing guides.sll.texas.gov.
- 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 Martin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Martin County has no zoning ordinance. The county legal census found no county zoning ordinance, citing guides.sll.texas.gov.
- 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 Martin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Martin County has no zoning ordinance. The county legal census found no county zoning ordinance, citing guides.sll.texas.gov.
- 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 Martin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Martin County has no zoning ordinance. The county legal census found no county zoning ordinance, citing guides.sll.texas.gov.
- 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 Martin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Martin County has no zoning ordinance. The county legal census found no county zoning ordinance, citing guides.sll.texas.gov.
- 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 Martin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Martin County has no zoning ordinance. The county legal census found no county zoning ordinance, citing guides.sll.texas.gov.
- 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 Martin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Martin County has no zoning ordinance. The county legal census found no county zoning ordinance, citing guides.sll.texas.gov.
- 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 Martin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Martin County has no zoning ordinance. The county legal census found no county zoning ordinance, citing guides.sll.texas.gov.
- 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
Who permits septicCounty
On-site sewage facilities in Martin County, including county OSSF permitting and inspection functions.
- The county acts as an authorized agent within its area of jurisdiction under the applicable TCEQ-approved OSSF delegation.
- TCEQ may review non-standard system plans, as stated on the Martin County application.
“Martin County staff will review plans and application, TCEQ Staff in Austin may review non-standard System plans.”
Martin County On-Site Sewage Facility Permit Application ↗Re-checked Sep 11, 2026
Septic permitRequired
New, modified, residential, commercial, mobile-home, multifamily, and RV-park OSSF installations covered by the Martin County OSSF application.
- An application, technical information sheet, site evaluation, installer drawing, planning materials, site and soil evaluation, directions, and appropriate fee must be submitted.
- Professional design by a registered surveyor or professional engineer is required for proprietary and non-standard systems.
- An Authorization to Construct is issued upon approval and is valid for one year from issuance.
- Construction can begin only after the Authorization to Construct is issued.
- The application states that unauthorized construction can result in civil and/or administrative penalties.
- All fees are non-refundable.
- The application lists a $200 fee for all new installation residential permits.
Authorization to Construct validity: 1 year from issuance · new installation residential permit fee: 200 USD
“Construction can only begin after the ATC (is issued).”
Martin County On-Site Sewage Facility Permit Application ↗Re-checked Sep 11, 2026
Septic inspectionRequired
Installation of an OSSF covered by the Martin County OSSF permit application.
- Inspection must occur before the system is covered.
- The office must be contacted at least 24 hours in advance to arrange inspection.
- After a successful inspection, a Notice of Approval is issued to the installer.
- A re-inspection fee equal to one-half of the permit amount must be paid directly to the inspector for each re-inspection.
- All fees must be paid before the Notice of Approval is issued.
advance notice for inspection: >= 24 hours · re-inspection fee: one-half of permit amount (applies each time the system must be re-inspected)
“An Inspection of the installation is required before covering of the system.”
Martin County On-Site Sewage Facility Permit Application ↗Re-checked Sep 11, 2026
Off-grid sanitationLimited
Off-grid wastewater sanitation using an on-site sewage facility in Martin County.
- An OSSF permit and Authorization to Construct are required before construction begins.
- The installation must pass the required inspection before being covered.
- The Martin County application requires site evaluation, planning materials, and identification of wells and separation distances.
- The source does not establish authorization for every type of non-OSSF sanitation system.
“Construction can only begin after the ATC (is issued). An Inspection of the installation is required before covering of the system.”
Martin County On-Site Sewage Facility Permit Application ↗Re-checked Sep 11, 2026
Driveway accessRequired
Any access connection, driveway, approach, or other improvement in the right-of-way of a Martin County road.
- The application is submitted to the Martin County Commissioner’s Court or County Judge by the primary operator or authorized representative.
- The application is only for securing or changing access to the owner’s property, not parking or servicing vehicles on county rights-of-way.
- Martin County may require relocation on 30 days’ written notice.
- The permittee must provide materials, avoid roadway damage, minimize inconvenience, restore disturbed fences, and provide 48 hours’ notice before work begins.
- Martin County may inspect and require changes, maintenance, and repairs; the permittee generally bears those costs.
advance notice before work: 48 hours · relocation notice: 30 days
“without a duly executed permit from Martin County.”
Policy for Installation on County Rights-of-Way: Residential Access Driveways ↗Re-checked Sep 11, 2026
Permit processPublished (with conditions)
Martin County on-site sewage facility permit applications for new residential installations.
- Professional design by a registered sanitarian or professional engineer is required for proprietary and non-standard systems.
- Martin County staff review plans and applications; TCEQ staff in Austin may review non-standard system plans.
- The Authorization to Construct is valid for one year from issuance.
- Construction may begin only after the Authorization to Construct is issued.
- Installation inspection is required before covering the system, and the office must be contacted at least 24 hours in advance.
- A Notice of Approval is issued after a successful inspection.
- A re-inspection fee equal to one-half of the permit amount is due directly to the inspector for each re-inspection.
- All fees must be paid before the Notice of Approval is issued.
Authorization to Construct validity: 1 year from issuance · inspection notice: >= 24 hours in advance
“The ATC is valid for one year from the Date of issuance. Construction can only begin after the ATC (is issued).”
Martin County On-Site Sewage Facility Permit Application ↗Re-checked Sep 11, 2026
Building permitNot required
Texas counties have only narrow statutory authority over structures in unincorporated areas and generally do not issue residential building permits; Martin County runs no county building-permit program (permits apply within the City of Stanton).
Texas Local Government Code Ch. 233 - County Regulation of Housing and Other Structures ↗Scouted from the county site, not yet independently re-checked
County-wide zoningAbsent
Texas counties lack general zoning authority over unincorporated land; Martin County does not zone unincorporated areas.
Texas State Law Library - Building Codes in Texas ↗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
Agricultural exemptionConditional
County regulation of land appraised as agricultural or open-space land, where the special statutory conditions apply.
- The special commissioners-court authority in Local Government Code §81.033 applies only to a county with population over 4,500, within 100 miles of an international boundary, and containing no incorporated municipality territory.
- That authority must be approved at a county election.
- The commissioners court may not regulate a tract appraised as agricultural or open-space land by the appraisal district.
“This section applies only to a commissioners court of a county that has a population of more than 4,500, is located within 100 miles of an international boundary, and contains no incorporated territory of a municipality. [...] If approved at an election held in the county for that purpose, the commissioners court has, in addition to the powers given to it under this code or other law, all the powers of the governing body of a Type A general-law municipality, including the powers contained in Subtitle A, Title 7, except that: [...] (2) the commissioners court may not regulate a tract of land that is appraised as agricultural or open-space land by the appraisal district;”
Texas Local Government Code Chapter 81 ↗Re-checked Sep 11, 2026
county zoning authorityLimited
Texas counties adopting zoning regulations for specified unincorporated or otherwise specially defined areas.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
- Other Chapter 231 subchapters address special areas including the Amistad Recreation Area in Val Verde County, military zones, certain lakes, the El Paso Mission Trail Historical Area, Lake Somerville, and Falcon Lake in Zapata County.
- The cited statute was enacted effective September 1, 1987; the Falcon Lake subchapter was added effective June 15, 2007, and amended effective September 1, 2009.
Padre Island distance from publicly owned park or recreational development: <= 2 miles (Area must be outside a municipality and in Cameron or Willacy County.) · Padre Island distance from beach, wharf, or bathhouse: <= 2 miles (The beach, wharf, or bathhouse must be used by at least 500 persons annually.)
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
county building authorityLimited
Texas counties adopting and enforcing fire-code building permits for specified buildings in unincorporated areas and applying residential building-code standards in certain counties.
- Under Section 233.061, the county must have a population over 250,000 or be adjacent to a county with a population over 250,000.
- Under Section 233.062, the fire code applies only to commercial establishments, public buildings, and multifamily residential dwellings consisting of four or more units constructed in an unincorporated area.
- The fire code does not apply to an industrial facility having a fire brigade that conforms to Occupational Health and Safety Administration requirements.
- A covered applicant must submit a plan and a commissioners-court-set application fee; the county must issue or deny the permit within 30 days, and failure to act within 30 days approves the construction for purposes of the subchapter.
- The fire code must conform to the International Fire Code or Uniform Fire Code as those codes existed on May 1, 2005, or establish protective measures exceeding those standards; later editions may be adopted.
- Residential standards under Section 233.152 apply only if the county adopts a resolution or order and the county is within 50 miles of an international border or has a population over 100.
- Those residential standards apply only to new single-family-house or duplex construction beginning after September 1, 2009; manufactured or modular structures governed by Occupations Code Chapters 1201 or 1202 are excluded from the definition of new residential construction.
- A municipality's building code controls in its extraterritorial jurisdiction, and Section 233.152 does not authorize county prior approval of new residential construction or county zoning regulations.
- Fire-code inspection and permit fees may be charged under a fee schedule based on building type, limited to amounts necessary to administer and enforce the subchapter; inspection fees must be reasonable and reflect approximate inspection costs.
county population threshold for fire-code authority: > 250000 persons (A county adjacent to a county over 250,000 also qualifies.) · multifamily residential dwelling threshold: >= 4 units (The fire code applies only to covered buildings constructed in an unincorporated area.) · residential-code border distance: <= 50 miles (Alternative qualification is county population over 100.) · application decision period: 30 days (If the commissioners court does not issue or deny the permit within 30 days after receiving the application and fee, construction is approved for purposes of the subchapter.) · residential standards effective construction date: > 2009-09-01 (Applies only to new residential construction that begins after September 1, 2009.)
“The commissioners court of a county with a population of over 250,000 or a county adjacent to a county with a population of over 250,000 may adopt a fire code and rules necessary to administer and enforce the fire code. [...] The fire code applies only to the following buildings constructed in an unincorporated area of the county: (1) a commercial establishment; (2) a public building; and (3) a multifamily residential dwelling consisting of four or more units.”
Local Government Code Chapter 233, County Regulation of Housing and Other Structures ↗Re-checked Sep 21, 2026

Still unanswered

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

Owner-builder exemption — Owner-builder exemptions from construction permitting or inspection requirements in Martin County, Texas
Inspections — Building inspection requirements in Martin County, Texas, including unincorporated areas
Certificate of occupancy — Certificate-of-occupancy requirements in Martin County, Texas, including unincorporated areas
Local zoning — Local zoning within Martin County, including incorporated municipalities and unincorporated areas.
Mandatory utility hookup — Water and sewer utility connection requirements in Martin County, Texas.

2 more unanswered

Building in a floodplain
Short-term rentals

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

Living off-grid in Martin County, Texas

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

Martin County scores 36/100 on the Bolthole Index, a marginal county profile. Its strengths: low administrative friction for a quiet rural property and manageable long-term carry cost. Watch-outs: thin water margin (15.8″/yr rainfall) and elevated mid-century heat, water, rain, or wildfire exposure.

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

Martin 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 Martin County OSSF Program (TCEQ authorized agent, Designated Representative). 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 Martin County?

Living in an RV on your own land in Martin County is allowed: Unincorporated Martin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Martin County has no zoning ordinance. The county legal census found no county zoning ordinance, citing guides.sll.texas.gov. 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 Martin County, Texas?

Land in Martin County runs about $2,051 per acre, based on the latest county data.

What is the water situation in Martin County?

Martin County gets about 15.8" of rain a year, with severe drought in roughly 36.7% of years.

How remote is Martin County?

A representative private-land location has about 13,328 people within a 30-minute drive and 973,498 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 septic rules in Martin County, Texas

At a glance

Who to call

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

Who handles permits and land-use questions in Martin County?

Does Martin County have zoning?

How do septic permits work in Martin County?

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

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

What to check before you buy land in Martin County

Watch-outs

Sources

Martin County in Texas

How Martin County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Martin County

Martin County rules

Texas rules that apply here

Still unanswered

Living off-grid in Martin County, Texas

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

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

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

How much does land cost in Martin County, Texas?

What is the water situation in Martin County?

How remote is Martin County?

How Martin compares in Texas