Bexar County, TX Building Permits, Zoning & Septic Rules

Unincorporated Bexar County, Texas does not require a building permit for an ordinary single-family home; permitting is voluntary unless a homeowners association or a lender requires it¹². A county permit is required only for commercial, public-accessible, or multi-family buildings of four or more units, issued by the Bexar County Fire Marshal's Office³. The county also has no zoning outside the City of San Antonio's Military Protection Area, so unincorporated land outside a city limit isn't zoned for any specific use⁴. Septic systems are a separate matter, permitted through Bexar County Environmental Services⁵.

At a glance

Building permit: Not required for a single-family home in unincorporated areas (voluntary only); required for commercial, public and multi-family (4+ unit) buildings¹³
Zoning: None in unincorporated areas outside the City of San Antonio's Military Protection Area⁴⁶
Septic permits: Bexar County Environmental Services (Public Works), a TCEQ-authorized agent⁵
RV / tiny home / manufactured home: Unrestricted under county rules, since there is no zoning ordinance⁷
Minimum lot size, setbacks, dwelling size: None set by the county in unincorporated areas⁸⁹¹⁰
Subdivision plat: Required whenever a lot is divided into 2 or more parts, regardless of zoning¹¹
Certificate of occupancy: Not required for a residence unless you voluntarily obtain a permit¹²
Septic soil difficulty: Only 5.7% of county soils are free of severe limits for a conventional drain field¹³

Who to call

Building permits

Bexar County Fire Marshal's Office

Building permits, plan review and inspections for commercial, public-accessible and multi-family (4+ unit) construction in unincorporated Bexar County; also accepts voluntary single-family residential permit submissions

210-335-0300

9810 Southton Road, San Antonio, TX 78223

Planning & zoning

Bexar County Public Works

Building Permit Authorizations, driveway/right-of-way permits, floodplain development permits, and Storm Water Quality Site Development Permits for unincorporated Bexar County

210-335-6700

1948 Probandt St., San Antonio, TX 78214

Septic permits

Bexar County Environmental Services (Public Works)

OSSF (septic) permits, inspections, and renewals for Bexar County as TCEQ's authorized agent

210-335-6700

1948 Probandt St., San Antonio, TX 78214

Contact details are copied from each office’s official page and were checked against it on September 28, 2026.

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

No, not for an ordinary single-family home. Unincorporated Bexar County has no legal authority to require a residential building permit unless the owner voluntarily submits plans, which usually happens to satisfy a homeowners association or a lender requiring a Certificate of Occupancy for financing¹². The county requires permits for commercial establishments, public buildings and multifamily residential buildings with four or more units in unincorporated areas³. The Commissioners Court adopted the 2021 International Fire and Building Codes effective January 1, 2024, and the Fire Marshal's Office enforces them for those covered building types¹⁴. A covered project needs a Building Permit Authorization from Public Works before its Fire Marshal application, and the county has 30 days to approve or deny the permit¹⁵. The issued permit remains valid for 180 days, provided construction starts during that period³. Fees follow an escalating schedule tied to total construction cost, using a minimum construction-cost basis of $25 per square foot¹⁶. Inspections occur during construction, and the Fire Marshal issues a Certificate of Occupancy after the covered building is complete¹⁷.

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

The Bexar County Fire Marshal's Office issues building permits for covered commercial, public-accessible and multi-family projects in unincorporated areas, at 9810 Southton Road, San Antonio, TX 78223, phone 210-335-0300¹⁸. Before applying to the Fire Marshal, you need a Building Permit Authorization from Bexar County Public Works, at 1948 Probandt Street, San Antonio, TX 78214, phone 210-335-6700¹⁹. That same Public Works office issues driveway and right-of-way permits and floodplain development permits for property in a FEMA floodplain, along with the Storm Water Quality Site Development Permit for construction that disturbs qualifying land¹⁹. If you're voluntarily seeking a residential permit for an HOA or lender requirement, that request also goes through the Fire Marshal's Office¹⁸².

Does Bexar County have zoning?

No, not in unincorporated areas outside a narrow exception. If your property sits in the unincorporated areas of Bexar County outside the City of San Antonio's Military Protection Area, it isn't zoned for any specific land use⁴⁶. Texas law backs this up: counties get zoning power only for specific, geographically limited areas, such as parts of Padre Island in Cameron or Willacy County, certain lakes, and military zones, none of which cover ordinary unincorporated Bexar County land²⁰. That means the county itself sets no minimum lot size, no minimum dwelling size, no setbacks, no lot-coverage limit and no building-height limit on unincorporated land⁸¹⁰⁹²¹²². If your property is inside San Antonio's city limits or another incorporated city in the county, contact that city's own zoning office instead, since the county's answer doesn't apply there, and San Antonio does hold land-use authority within its designated Military Protection Areas²³. One county-level rule still reaches unincorporated land regardless of zoning: dividing a lot into two or more parts requires a subdivision plat signed and sealed by a licensed engineer and surveyor, reviewed and approved by Commissioners Court or the Executive Director of Infrastructure Services¹¹.

How do septic permits work in Bexar County?

Every on-site sewage facility (OSSF) in Bexar County needs a permit, issued through Bexar County Environmental Services, a division of Public Works acting as TCEQ's authorized agent, at 1948 Probandt Street, San Antonio, TX 78214, phone 210-335-6700⁵²⁴²⁵. A permit is required in four situations: installing a new system, repairing or changing an existing one, renewing a standard system every 5 years with a pump receipt and a $30 fee, or permitting an existing system that was never permitted, which needs a sanitarian or engineer's site survey and a pump manifest no older than a year²⁶. Aerobic systems carry their own timeline: the initial permit is good for 2 years, after which the homeowner must keep a service contract on file and the provider must submit quarterly maintenance reports²⁶. Every installation is inspected at multiple points to confirm the tank went in according to regulation²⁷⁵. Soils make this more than paperwork: only 5.7% of Bexar County's land is free of severe limitations for a conventional septic drain field, so plan on an engineered or alternative system on most rural sites¹³. Texas's statewide 10-acre exemption can waive the OSSF permit if a licensed site evaluator confirms the tract qualifies, the dwelling is the only one on it, every part of the system stays at least 100 feet from the property line, and effluent stays on the property, but anything smaller than 10 acres, or missing one condition, still needs the county permit²⁸. If you need a well in the Edwards Aquifer Authority's jurisdiction, a domestic or livestock well producing no more than 25,000 gallons a day can usually register as exempt from a groundwater withdrawal permit, while a limited-production well can draw up to 1.4 acre-feet a year with registration, a meter and a $25 annual fee²⁹.

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

Yes. Because unincorporated Bexar County outside the COSA Military Protection Area has no zoning ordinance, county rules leave RV occupancy, tiny homes, manufactured homes, accessory dwellings and temporary camping on your own land unrestricted⁷. Deed restrictions, an HOA, or another law can still limit what you do even where the county itself sets no zoning rule²³. If a lender requires a Certificate of Occupancy, or an HOA requires county-permitted construction, you must voluntarily submit for a residential permit and pass the structural, electrical, plumbing and HVAC inspections that go with it²³⁰. For ordinary residential construction that was not voluntarily permitted, Bexar County does not require or issue a residential Certificate of Occupancy after construction³¹.

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

First, confirm whether your land is unincorporated, inside a city limit, or inside San Antonio's Military Protection Area, since that determines whether county or city rules apply to zoning and permitting²³. Second, if you're building a commercial, public-accessible, or multi-family (four or more unit) structure, get a Building Permit Authorization from Public Works, then submit two sets of architectural plans and the permit application to the Fire Marshal's Office, and expect a decision within 30 days¹⁹¹⁸¹⁵. Third, for an ordinary single-family home, there's no county permit to apply for unless an HOA or lender requires one, in which case submit voluntarily to the Fire Marshal's Office². Fourth, apply for your septic permit through Bexar County Environmental Services before installing an OSSF, budgeting time for a site evaluation given how little of the county's soil is free of severe limitations²⁴¹³. Fifth, if your driveway connects to a county-maintained road, submit a driveway application with a sketch of the work, along with the $35 fee, to Public Works before construction, and expect a county inspection once it's approved³²¹⁹. Sixth, if your driveway instead connects to a state highway, apply to the TxDOT district office using Form 1058 and give TxDOT 24-hour notice before work begins³³. Seventh, if you're dividing your tract into two or more lots, get your subdivision plat signed and sealed by a licensed engineer and surveyor and approved by Commissioners Court before recording it¹¹.

What to check before you buy land in Bexar County

Soils are the headline issue here: only 5.7% of Bexar County's land is free of severe limitations for a conventional septic drain field, and severe drought occurs in 28.4% of years, so budget for a careful septic design and reliable water planning¹³³⁴. Terrain is mostly workable, with 90.1% of land at 15% slope or less, though only 40.8% of the county is wooded, so shade and screening vary by parcel³⁵³⁶. Confirm whether your target parcel sits inside a city limit or the COSA Military Protection Area before relying on the county's no-zoning and residential-permit answers²³. If the land was recently split off a larger tract, confirm it went through the county's subdivision-plat process¹¹. Existing agricultural or nursery operations may be exempt from the county's Storm Water Quality Site Development Permit when conducted as a main or accessory use³⁷. The typical effective property-tax rate is about 1.8%, with a median annual bill around $4,429 and a typical home value near $257,364³⁸³⁹⁴⁰.

Watch-outs

Bexar County does not publish a distinct owner-builder exemption from its voluntary residential permitting process; ask the Fire Marshal's Office how it will handle your project if you plan to act as your own contractor⁴¹.
Even where Bexar County itself sets no zoning rule, deed restrictions, HOA covenants, and other laws can still limit what you build; the county's own guidance says so explicitly²³.
Only 5.7% of Bexar County's soils are free of severe limitations for a conventional septic drain field; get a site evaluation before you commit to a parcel¹³.

Sources

Written September 28, 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 Bexar County scores

Seclusion13100% ev.

Self-Sufficiency4696% ev.

Admin Boringness8790% ev.

Durability53100% ev.

Property Autonomy71100% ev.

Carry Cost66100% 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 →

$257kTypical home

1.8%Property tax

$7,540Land / acre

31.4"Annual rain

28.4% of yrsSevere drought

42.3 / yr (+30.1)Mid-century 100°F days

25.6 daysMid-century dry spell

2.24" (+7.7%)Mid-century 1-day rain

1.39×Wildfire change factor

100%Forward climate coverage

$1,771Home insurance / yr

1.4% / yrInsurance growth

0%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

846,065People within 30 min

5,363,230People within 2 hr

1,049,525Radius comparison (15 mi)

1,683.2People / sq mi

5.9%Federal land

90.1%Land at 15% slope or less

5.7%Septic soil without severe limits

44,855 acWorkable land screen

40.8%Wooded land

17.4 tonsBiomass / forest ac

69.5°FAvg temp

Answers from the rulebook for Bexar County

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

Bexar County rules

Building permitRequired
New commercial, public-accessible, or multi-family residential buildings; placement of a pre-built building; or an existing building undergoing a substantial improvement in unincorporated Bexar County.
- The requirement applies in unincorporated areas of the county.
- A multi-family dwelling is defined by the County as a residential structure consisting of four or more residential dwelling units.
- The owner is ultimately responsible for obtaining the permit, although an authorized agent may apply.
- Before applying, a Building Permit Authorization must be obtained from Bexar County Public Works.
- The application requires two sets of architectural plans, a completed permit application, the signed BPA, and the applicable Commissioners Court permit fee.
- The County states that permit review and issuance or denial is subject to a 30-day period under Texas Local Government Code §233.063.
- The building permit is valid for 180 days from issuance; construction must start within that period, and renewal is case-specific.
- Requirements may differ within municipal limits and may be supplemented by municipal requirements in an extraterritorial jurisdiction.
minimum multi-family dwelling units: >= 4 dwelling units · permit review and issuance or denial period: 30 days · permit validity period: 180 days (Construction must start within this period.)
“building permit is required in the unincorporated areas of the county [...] commercial, public accessible, or multi-family residential purposes”
Fire Marshal - New Construction FAQs ↗Re-checked Sep 10, 2026
One more reviewed finding on this topic
- Limited — Single-family residential construction in unincorporated Bexar County.
  “submitted for permitting on a voluntary basis.”
  Fire Marshal - New Construction FAQs ↗Re-checked Sep 10, 2026
Building code adoptedPartial
Commercial structures, public assembly/access buildings, and multi-family dwellings constructed in unincorporated Bexar County.
- The Commissioners Court adopted the 2021 edition of the International Fire and Building Codes on December 12, 2023.
- The 2021 codes and Bexar County amendments became effective January 1, 2024.
- The county Fire Marshal issues building construction permits for commercial and public accessible buildings and multi-family dwellings.
- A multi-family dwelling is defined by the county as a residential structure consisting of four or more residential dwelling units.
- The county source states the code-enforcement scope is for unincorporated areas.
- The county does not enforce City of San Antonio locally developed amendments, but has local rules for enforcement of the International Fire Code and International Building Code.
adoption date: 2023-12-12 · effective date: 2024-01-01 · multi-family dwelling threshold: >= 4 residential dwelling units
“The Code Enforcement Section ensures that new commercial structures and places of public assembly and access built within the unincorporated areas meet standards as outlined by the International Fire and Building Codes, as well as NFPA Standards adopted by Bexar County Commissioners Court.”
Code Enforcements and Inspections | Bexar County, TX - Official Website ↗Re-checked Sep 10, 2026
InspectionsRequired
Commercial, public-accessible, and other buildings regulated by the Bexar County Fire Marshal in unincorporated Bexar County.
- Inspections occur during each phase of construction.
- At minimum, inspections include structural frame where fire resistance or separation is required, electrical rough-in, HVAC rough-in, and final inspection for issuance of the Certificate of Occupancy (Compliance).
- Fire Marshal inspectors or investigators may inspect at any time to verify construction documents are on-site.
- Failure to produce construction documents or permits may result in penalty assessment, permit revocation, refusal of final utility connections, or denial of the Certificate of Occupancy (Compliance).
“At a minimum, the following inspections are required: structural frame [...] electrical rough-in; HVAC rough-in; and final inspection”
Code Enforcements and Inspections ↗Re-checked Sep 10, 2026
One more reviewed finding on this topic
- Limited — Single-family residential construction in unincorporated Bexar County when the owner voluntarily obtains a residential building permit.
  “certain inspections (structural frame, electrical, plumbing, and HVAC) are required.”
  Fire Marshal - New Construction FAQs ↗Re-checked Sep 10, 2026
Certificate of occupancyRequired
Opening a new business within an existing structure or changing an existing occupancy/business use in unincorporated Bexar County.
- A Change of Occupancy Application must be submitted before opening the new business.
- The Bexar County Public Works Authorization to Issue Building Permits must be approved as part of the change-of-occupancy process.
- All application pages must be completed and submitted to the Fire Marshal's Office with the inspection fee.
- The inspector schedules an inspection.
- A change-of-occupancy certificate is issued only if the occupancy type complies with the current Building and Fire Code.
- The fee schedule states that a change-of-occupancy inspection and new Certificate of Occupancy costs $200.00.
- Opening without obtaining a required reinspection and Change of Occupancy Certificate may incur a $150.00 reinspection fee.
change of occupancy use inspection fee: 200 USD (Includes the required inspection and issuance of a new Certificate of Occupancy.) · opening without change-of-occupancy reinspection fee: 150 USD (Applies when violations after an initial inspection were not corrected and the occupancy opens without obtaining reinspection and a Change of Occupancy Certificate.)
“This document is the application required to be submitted prior to opening a new business within an existing structure. [...] a change of occupancy certificate will be issued.”
Permits & Applications ↗Re-checked Sep 26, 2026
3 more reviewed findings on this topic
- Not required — Residential properties in unincorporated Bexar County that are not voluntarily submitted for residential permitting.
  “Current State Law does not require residential properties to [...] be issued a Certificate of Occupancy.”
  Residential Permitting and Certificates of Occupancy ↗Re-checked Sep 10, 2026
- Required — New commercial structures, public assembly or public-access buildings, and multi-family dwellings constructed in unincorporated Bexar County.
  “Inspections are conducted during each phase of the construction project, and when the building is complete, a Certificate of Occupancy is issued.”
  Code Enforcements and Inspections ↗Re-checked Sep 26, 2026
- Not required — Ordinary residential construction in unincorporated Bexar County where no voluntary residential building permit was issued.
  “unless a residential building permit was issued on a voluntary basis, the County does not have legal authority to [...] issue a residential Certificate of Occupancy.”
  FAQs - Residential Certificate of Occupancy ↗Re-checked Sep 26, 2026
County-wide zoningAbsent
Zoning regulations in unincorporated Bexar County areas outside municipal city limits.
- Other development regulations may apply to the property.
- The source specifically limits the no-zoning statement to unincorporated areas, defined as areas not within municipal city limits.
“In the unincorporated areas of the County (any area not within a municipal city limits) there are no zoning regulations. However, there may be other development regulations that apply to the property.”
Code Enforcements and Inspections | Bexar County, TX - Official Website ↗Re-checked Sep 10, 2026
Local zoningVaries (with conditions)
Aggregate local zoning across Bexar County: unincorporated areas outside the COSA Military Protection Area are not zoned for a specific land use, while properties within incorporated municipalities must be evaluated under the applicable city zoning authority.
- For property within San Antonio or another incorporated Bexar County city, the county directs the requester to contact the city office for zoning information.
- The City of San Antonio has land-use authority in designated Military Protection Areas.
- For unincorporated areas outside the COSA Military Protection Area, the county states the property is not zoned for any specific land use.
- Deed restrictions, neighborhood or homeowner association rules, and other laws and regulations may still govern improvements or construction.
“If your property is located within the city limits of San Antonio or another incorporated city in Bexar County, contact the city office for your zoning information. The City of San Antonio (COSA) does have Land Use Authority within areas that are designated as a Military Protection Area (MPA).”
Frequently Asked Questions | Bexar County, TX - Official Website ↗Re-checked Sep 10, 2026
Zoning districtsNot published
Zoning districts for property in unincorporated Bexar County outside the City of San Antonio Military Protection Area and outside incorporated city limits.
- The County states that property in this unincorporated area is not zoned for any specific land use.
- Municipal zoning applies within incorporated city limits; the City of San Antonio has Land Use Authority in Military Protection Areas.
- Deed restrictions, homeowner-association rules, and other laws and regulations may still govern construction or improvements.
“If your property is located in the unincorporated areas of Bexar County outside of the COSA MPA, your property is not zoned for any specific land use.”
Frequently Asked Questions ↗Re-checked Sep 10, 2026
Minimum dwelling sizeNone
Zoning-based minimum dwelling-size requirements in unincorporated Bexar County.
- The county states that other development regulations may apply.
- Municipal requirements may apply in incorporated cities and certain municipal extraterritorial jurisdictions.
“In the unincorporated areas of the County (any area not within a municipal city limits) there are no zoning regulations. However, there may be other development regulations that apply to the property.”
Code Enforcements and Inspections ↗Re-checked Sep 10, 2026
Minimum lot sizeNone
Zoning-based minimum lot-size requirements in unincorporated Bexar County.
- Subdivision and platting requirements may still apply when property is divided.
- The county states that other development regulations may apply to the property.
- Municipal requirements may apply in incorporated cities and certain municipal extraterritorial jurisdictions.
“In the unincorporated areas of the County (any area not within a municipal city limits) there are no zoning regulations. However, there may be other development regulations that apply to the property.”
Code Enforcements and Inspections ↗Re-checked Sep 10, 2026
SetbacksNone
Zoning-based setback requirements in unincorporated Bexar County.
- The county states that other development regulations may apply to the property.
- Municipal requirements may apply in incorporated cities and certain municipal extraterritorial jurisdictions.
“In the unincorporated areas of the County (any area not within a municipal city limits) there are no zoning regulations. However, there may be other development regulations that apply to the property.”
Code Enforcements and Inspections ↗Re-checked Sep 10, 2026
Lot coverageNone
Zoning-based lot-coverage requirements in unincorporated Bexar County.
- The county states that other development regulations may apply to the property.
- Municipal requirements may apply in incorporated cities and certain municipal extraterritorial jurisdictions.
“In the unincorporated areas of the County (any area not within a municipal city limits) there are no zoning regulations. However, there may be other development regulations that apply to the property.”
Code Enforcements and Inspections ↗Re-checked Sep 10, 2026
Building heightNone
Zoning-based building-height requirements in unincorporated Bexar County.
- The county states that other development regulations may apply to the property.
- Municipal requirements may apply in incorporated cities and certain municipal extraterritorial jurisdictions.
“In the unincorporated areas of the County (any area not within a municipal city limits) there are no zoning regulations. However, there may be other development regulations that apply to the property.”
Code Enforcements and Inspections ↗Re-checked Sep 10, 2026
Living in an RV · by state lawNo county rule
Unincorporated Bexar County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Bexar County has no zoning ordinance. Bexar County's own reviewed answer confirms it has no county-wide zoning.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- 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 Bexar County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Bexar County has no zoning ordinance. Bexar County's own reviewed answer confirms it has no county-wide zoning.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- 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 Bexar County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Bexar County has no zoning ordinance. Bexar County's own reviewed answer confirms it has no county-wide zoning.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- 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 Bexar County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Bexar County has no zoning ordinance. Bexar County's own reviewed answer confirms it has no county-wide zoning.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- 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 Bexar County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Bexar County has no zoning ordinance. Bexar County's own reviewed answer confirms it has no county-wide zoning.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- 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 within Bexar County.
- The cited county page states that all on-site sewage facilities within Bexar County must be permitted.
“Bexar County requires that all on‐site sewage facilities within Bexar County have to be permitted.”
On-Site Sewage Facilities ↗Re-checked Sep 10, 2026
Septic permitRequired
New, repaired, renewed, or previously unpermitted on-site sewage facilities in Bexar County.
- A new permit is required when installing a new system and approves a License to Operate.
- A repair permit is required for repairs or changes to an existing system and approves a License to Operate.
- Standard systems must be renewed every 5 years by pumping the tank and submitting a pump receipt and a $30 renewal fee to Bexar County.
- For aerobic systems, the initial permit is valid for 2 years after installation; afterward, the homeowner must maintain a service contract and submit it to Bexar County, and the service provider must submit quarterly maintenance reports.
- An existing-system permit or registration is required when an existing system lacks a permit; the owner must hire a sanitarian or engineer for a site survey and septic design, and submit a pump manifest no older than one year.
standard-system renewal interval: 5 years · standard-system renewal fee: 30 USD · aerobic initial permit validity: 2 years after installation · existing-system pump manifest age: <= 1 year maximum
“There are four (4) instances when a permit is required:”
On-Site Sewage Facilities ↗Re-checked Sep 10, 2026
Septic inspectionRequired
Installation of septic tanks in Bexar County.
- The county states inspections occur at various points during installation.
- The inspection checks whether the tank is installed according to regulation.
“All installations of septic tanks are inspected at various points during the installation.”
On-Site Sewage Facilities ↗Re-checked Sep 10, 2026
Off-grid sanitationAllowed (with conditions)
On-site wastewater treatment and disposal on the same property in Bexar County.
- An OSSF is defined by the county as a wastewater disposal system that treats and disposes of effluent on the same property that produces it.
- All OSSFs within Bexar County must be permitted.
- Applicable new, repair, renewal, or existing-system permit requirements and inspections apply.
“On‐Site Sewage Facilities (OSSF) are wastewater disposal systems designed to treat and dispose of effluent”
On-Site Sewage Facilities ↗Re-checked Sep 10, 2026
Well permitLimited
Groundwater withdrawal wells in the Edwards Aquifer Authority jurisdiction within Bexar County.
- Texas states that groundwater production and use is regulated by local or regional groundwater conservation districts rather than a state agency.
- An exempt well may withdraw without a groundwater withdrawal permit only if the owner properly registers it, demonstrates it cannot produce more than 25,000 gallons per day, uses it solely for domestic or livestock use, and it does not serve a subdivision requiring platting.
- A well serves a subdivision requiring platting if it provides water to more than three homes in a neighborhood or development where parcels were subdivided and recorded with a county.
- Limited production wells may withdraw up to 1.4 acre-feet per year without an EAA groundwater withdrawal permit, but require registration, a registered meter, annual use reports, and a $25 yearly administration fee; the EAA page states this category applies to wells drilled before June 1, 2013 and meeting the stated use limit.
exempt-well production capacity: <= 25000 gallons per day (Domestic or livestock use only and no subdivision requiring platting) · limited-production annual withdrawal: <= 1.4 acre-feet per year (Registration, meter, annual reports, and $25 yearly administration fee required) · limited-production administration fee: 25 USD per year
“Well owners who qualify under this category may make withdraws from the aquifer without the need for a groundwater withdrawal permit.”
Groundwater Regulation for Private Well Owners ↗Re-checked Sep 10, 2026
Mandatory utility hookupConditional
Wastewater arrangements identified in Bexar County building/system permitting materials.
- The official permit application provides for either a public sewer system or an OSSF system.
- The application states that Public Works Environmental Services authorization is required for an OSSF system.
- The county FAQ states an on-site sewer system permit may be required if no developed sewer system is available.
- This claim does not establish a universal countywide mandate to connect to public water or sewer.
“An OSSF permit is required for sites that are not serviced by public sanitary sewer.”
Building and System Permit Application ↗Re-checked Sep 10, 2026
Agricultural exemptionAvailable (with conditions)
Bexar County Storm Water Quality Site Development Permit requirements for existing nursery and agricultural operations conducted as a main or accessory use in unincorporated Bexar County.
- The exemption is limited to existing nursery and agricultural operations.
- The operation must be conducted as a main or accessory use.
- This exemption concerns the Site Development Permit under the Bexar County stormwater regulations and does not establish an exemption from unrelated permits or regulations.
- The regulations state that they apply in all unincorporated areas of Bexar County.
“5.03 EXEMPT ACTIVITY: No Storm Water Quality Site Development Permit is required forthe following activities: 5.03.1 Any emergency activity that is immediately necessary for the protection of life, property, or natural resources. 5.03.2 Existing nursery and agricultural operations conducted as a main or accessory use.”
Bexar County Regulations for Storm Water Pollution Prevention ↗Re-checked Sep 10, 2026
Subdividing landRegulated (with conditions)
Division or subdivision of property or a lot into two or more parts in unincorporated Bexar County.
- A subdivision plat is required when a property or lot is divided or subdivided into 2 or more parts.
- The plat must be signed and sealed by a licensed professional engineer and a licensed surveyor.
- The plat is reviewed by the local government entity and approved by the Commissioners Court or Executive Director of Infrastructure Services in Bexar County.
- Recording an approved plat establishes the new legal description of the lot or lots.
trigger: >= 2 parts
“Subdivision plats are required any time a property or lot is divided or subdivided into 2 or more parts and must be signed and sealed by a licensed professional engineer and a licensed surveyor, reviewed by the local government entity and approved signed by the reviewing authority (Commissioners Court or Executive Director of Infrastructure Services in Bexar County).”
Subdivision Plats ↗Re-checked Sep 10, 2026
One more reviewed finding on this topic
- Regulated (with conditions) — Subdivision platting for property or lots divided or subdivided into two or more parts in unincorporated Bexar County.
  “Subdivision plats are required any time a property or lot is divided or subdivided into 2 or more parts and must be signed and sealed by a licensed professional engineer and a licensed surveyor, reviewed by the local government entity and approved signed by the reviewing authority (Commissioners Court or Executive Director of Infrastructure Services in Bexar County).”
  Subdivision Plats ↗Re-checked Sep 29, 2026
Driveway accessRequired
A driveway or entrance connecting to a County road and involving a County-maintained right-of-way.
- The applicant must submit a driveway application.
- The application must include a sketch or drawing detailing the work in the right-of-way.
- The fee is $35 for each driveway or entrance.
- Applications are reviewed and, if approved, must be inspected by County construction inspectors.
- The rule concerns County-maintained rights-of-way and County roads; incorporated-city requirements may also apply where relevant.
driveway application fee: per 35 USD per driveway or entrance
“The Public Works Department is charged with controlling all construction activities that take place in County-maintained rights-of-way.”
Frequently Asked Questions ↗Re-checked Sep 10, 2026
Permit feesVariable (with conditions)
Bexar County building permits for regulated commercial, public-accessible, and multi-family construction in unincorporated areas.
- The cost is based on an escalating fee schedule approved by the Commissioners Court.
- The permit fee includes all required inspections and issuance of the final Certificate of Occupancy (Compliance).
- The exact fee should be obtained from the Fire Code Section using the building's total construction cost.
- The minimum cost of construction is calculated at $25.00 per square foot.
- Permit fees are non-refundable and may be paid by cash, check, or money order; cash payments require the exact amount.
minimum construction-cost basis: 25 USD per square foot
“The cost of a building permit is based on an escalating fee schedule approved by the Commissioners Court.”
Fire Marshal - New Construction FAQs ↗Re-checked Sep 10, 2026
Permit processPublished (with conditions)
Bexar County building-permit process for regulated construction in unincorporated areas.
- A Building Permit Authorization must be obtained from Bexar County Public Works before applying to the Fire Marshal's Office.
- The application requires two sets of architectural plans, a completed permit application, a completed and signed BPA, and the permit fee.
- Plans must include a site plan, floor plan, elevations for all four sides, electrical layout, and HVAC layout.
- The County has 30 days to review and issue or deny a building permit.
- Additional permits or work authorizations may be required after plan review.
review deadline: 30 days
“Before applying for a building permit, a Building Permit Authorization (BPA) must be obtained from Bexar County Public Works.”
Fire Marshal - New Construction FAQs ↗Re-checked Sep 10, 2026

Texas rules that apply here

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 — An owner-builder exemption from Bexar County building-permit or inspection requirements.
Short-term rentals — Short-term rental use in Bexar County, including unincorporated areas and incorporated municipalities.

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 Bexar 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 ↗

Hill Country Priority Groundwater Management Areapartial of county
TCEQ PGMA identifying existing or anticipated critical groundwater problems; drives GCD coverage and heightened management. Domestic/livestock wells remain exempt from GCD permits 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 Bexar County, Texas

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

Bexar County scores 42/100 on the Bolthole Index, a marginal county profile. Its strengths: low administrative friction for a quiet rural property and a stronger property-autonomy legal backdrop. Watch-outs: about 846,065 people within a 30-minute drive.

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

Bexar 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 Bexar County Environmental Services (Public Works) - TCEQ OSSF authorized agent. 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 Bexar County?

Living in an RV on your own land in Bexar County is allowed: Unincorporated Bexar County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Bexar County has no zoning ordinance. Bexar County's own reviewed answer confirms it has no county-wide zoning. Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits. 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 Bexar County, Texas?

Land in Bexar County runs about $7,540 per acre, based on the latest county data.

What is the water situation in Bexar County?

Bexar County gets about 31.4" of rain a year, with severe drought in roughly 28.4% of years. On water rights, Bexar County lies in the Hill Country Priority Groundwater Management Area — TCEQ PGMA identifying existing or anticipated critical groundwater problems; drives GCD coverage and heightened management. Domestic/livestock wells remain exempt from GCD permits but spacing/registration may apply..

How remote is Bexar County?

A representative private-land location has about 846,065 people within a 30-minute drive and 5,363,230 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 unincorporated Bexar County, Texas

At a glance

Who to call

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

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

Does Bexar County have zoning?

How do septic permits work in Bexar County?

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

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

What to check before you buy land in Bexar County

Watch-outs

Sources

Bexar County in Texas

How Bexar County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Bexar County

Bexar County rules

Texas rules that apply here

Still unanswered

Water rights & wells in Bexar County

Living off-grid in Bexar County, Texas

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

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

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

How much does land cost in Bexar County, Texas?

What is the water situation in Bexar County?

How remote is Bexar County?

How Bexar compares in Texas