Bolthole Index

Bexar County, Texas

Building permits, zoning and septic rules in San Antonio, Texas

San Antonio, Texas requires building permits for construction work inside city limits, with applications handled by the city’s Development Services Department.12 San Antonio administers its own zoning districts; Bexar County Environmental Services handles septic permits under the county’s requirement that all on-site sewage facilities be permitted.34

At a glance

Building permits
Required for construction work inside San Antonio city limits; homeowners or contractors may apply.1
Zoning
City zoning districts and permitted uses are administered by Development Services.35
Residential building code
San Antonio has adopted the 2024 International Residential Code with city amendments.6
Septic permits
Bexar County Environmental Services handles on-site sewage facilities; countywide permitting applies.47
Building inspections
Required inspections are generated after a building permit is issued; applicants coordinate them.8
Floodplain development
A city Flood Plain Development Permit is required for development in the regulatory FEMA floodplain.9

Who to call

Building permits

San Antonio Development Services Department

City building-permit applications, inspection coordination and Flood Plain Development Permit inquiries at the One Stop counter.

210-207-1111

1901 s. alamo st. san antonio, tx 78204

Online permits →

Planning & zoning

San Antonio Development Services Zoning

City zoning questions, zoning verification letters and rezoning inquiries.

210-207-1111

1901 s. alamo st. san antonio, tx 78204

Septic permits

Bexar County Environmental Services

Countywide septic permits, installation inspections and renewals.

210-335-6700

612 nogalitos san antonio tx 78204

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Off-grid gear

Going off-grid in San Antonio means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in San Antonio, TX?

San Antonio requires a building permit for construction work inside city limits, and a homeowner or contractor may obtain the permit.1 San Antonio has adopted the 2024 International Residential Code with city amendments for one- and two-family dwellings.6

Being able to submit a homeowner application does not establish an exemption from San Antonio’s building-permit requirement.1 We could not confirm a city owner-builder exemption; ask Development Services which work you may perform yourself and which contractor credentials the project requires.10

Who issues building permits in San Antonio, and how do you apply?

San Antonio’s Development Services Department accepts building-permit applications, with some building permits available through the online system.2 Reach the city’s One Stop office at 210-207-1111 or visit 1901 S. Alamo St., San Antonio, TX 78204.10

A conditional or partial building permit may be available if a Development Services engineer approves the request; submitting an application alone does not establish that approval.2 After San Antonio issues a building permit, required inspections are generated, and the applicant must monitor and coordinate them while keeping required plans and permits on site.8

Does San Antonio have zoning, and how do you check a parcel?

San Antonio has city zoning districts and supplemental use regulations in its Unified Development Code.3 The Zoning Section of Development Services provides a permitted-uses list describing each district.5 Ask that section to identify the parcel’s district and the permitted use for your proposed home before choosing a building design.5

San Antonio also offers an optional Zoning Verification Letter identifying a property’s current zoning.11 We could not confirm the applicable residential lot-size, setback, lot-coverage or height schedule here; ask city Zoning for the standards for the actual parcel rather than treating a citywide figure as the answer.11

How do septic permits work inside San Antonio?

Bexar County Environmental Services handles septic permitting under a countywide requirement that all on-site sewage facilities be permitted, so city building approval does not replace septic approval.47 New installations need a new septic permit, and repairs or changes to an existing system need a repair permit.7 Septic tanks are inspected at various points during installation.12

Bexar County standard septic systems require renewal every 5 years, including tank pumping, a pump receipt and a $30 renewal fee.7 Texas’s conditional 10-acre exemption should not be treated as a Bexar County permit waiver: the county states that all systems must be permitted.137

Can you live in an RV or tiny home on San Antonio land?

We could not confirm an ordinary residential-lot RV occupancy rule or a separate tiny-home occupancy rule for San Antonio; ask city Zoning to evaluate the proposed use at the address.11 San Antonio’s district-based permitted-uses system is the starting point for that answer.5

San Antonio’s manufactured-home and recreational-vehicle park rule requires sewer lines to connect to public sewage or a private disposal system approved by the director of health.14 That park-specific provision does not establish permission to live in an RV on an ordinary residential lot.14 A tiny dwelling involving construction still needs its building-permit question resolved with Development Services.1

Building a home in San Antonio: what are the steps, in order?

  1. Ask San Antonio Zoning to identify the parcel’s district and verify the proposed residential use.5
  2. Ask Development Services about a Flood Plain Development Permit if the site lies in the regulatory 100-year FEMA floodplain.9
  3. If the home will use septic, arrange Bexar County septic approval and installation inspections alongside the city building application.712
  4. Submit the San Antonio building-permit application through Development Services or an available online application route.2
  5. Once the building permit is issued, coordinate the required inspections and keep the required plans and permits on site.8

What should you check before buying land in San Antonio?

Confirm which side of San Antonio’s city limits the parcel occupies: San Antonio administers city zoning, while unincorporated Bexar County outside the city’s Military Protection Area is not zoned for a specific land use.315 For land outside San Antonio, use the Bexar County guide to follow the county’s applicable rules.16

Inside San Antonio, development in the regulatory FEMA floodplain requires a city Flood Plain Development Permit.9 We could not confirm a private-well permit rule or the substantive city platting exceptions here; ask Development Services which office should review the proposed water supply and parcel division before committing to the purchase.10

Watch-outs

  • San Antonio building permits and zoning are city responsibilities; Bexar County’s lack of zoning outside municipal limits does not describe land inside San Antonio.3117
  • San Antonio residential building permits may expire if work does not begin within 180 days or is suspended or abandoned for 180 days.8
  • An existing Bexar County septic system without a permit needs an existing-system permit or registration, including a sanitarian or engineer’s site survey and septic design.7

Sources

  1. sanantonio.gov (San Antonio), quoted and re-checked
  2. Development Services Frequently Asked Questions (San Antonio), quoted and re-checked
  3. Unified Development Code § 35-371, Accessory Dwellings (San Antonio), quoted and re-checked
  4. On-Site Sewage Facilities, quoted and re-checked
  5. Development Services Frequently Asked Questions: Zoning Districts (San Antonio), quoted and re-checked
  6. Adoption of International Residential Code (2024) (San Antonio), quoted and re-checked
  7. On-Site Sewage Facilities, quoted and re-checked
  8. Information Bulletin 130: Required Building Inspections for One- and Two-Family Dwellings (San Antonio), quoted and re-checked
  9. Development Services Frequently Asked Questions: Flood Plain Development Permit (San Antonio), quoted and re-checked
  10. San Antonio Development Services Department (sa.gov)
  11. San Antonio Development Services Zoning (sa.gov)
  12. On-Site Sewage Facilities, quoted and re-checked
  13. Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
  14. Unified Development Code § 35-379, Manufactured Home and Recreational Vehicle Parks (San Antonio), quoted and re-checked
  15. bexar.org, quoted and re-checked
  16. Frequently Asked Questions | Bexar County, TX - Official Website, quoted and re-checked
  17. Code Enforcements and Inspections | Bexar County, TX - Official Website, quoted and re-checked

Written October 11, 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.

Answers from the rulebook for San Antonio

San Antonio’s own rules

  • Building permitRequired

    Construction work inside San Antonio city limits.

    • The permit may be obtained by the homeowner or contractor.
    • Some permits are available through the online permitting system.
    “A permit will be required when any construction work is conducted. Permit may be obtained by the homeowner or contractor at 1901 S. Alamo during business hours. Some permits can also be obtained via the Online Permitting System.”
  • Building code adoptedAdopted

    One- and two-family dwellings inside San Antonio city limits.

    • The adopted IRC is subject to city amendments in § 10-37 and other adopted building-related codes.

    code edition: 2024 International Residential Code for One-and-Two-family Dwellings (as amended by § 10-37)

    “The 2024 edition of the International Residential Code for One-and-Two-family Dwellings , promulgated by the International Code Council, Chapters 2 through 10, 12 through 23, Section P2904, Chapter 44 and Appendices BB, BG and BO are adopted and incorporated in this article by reference as if fully set forth, except as it is amended by the following provisions of section 10-37 .”
  • InspectionsRequired

    Typical new residential construction and one- and two-family dwellings inside San Antonio city limits.

    • Required inspections are generated after issuance of a building permit.
    • The applicant must monitor and coordinate inspections and keep required plans or permits on site.
    • A missing approved permit, approved plans, or visible address may result in a failed inspection and reinspection fee.

    permit commencement deadline: 180 days (permits may also expire after 180 days of suspension or abandonment)

    “Once a building permit is issued, required inspections are generated. It is expected that the applicant of the building permit monitor and coordinate the required inspections and ensure any required plans or permits are on site.”
  • Certificate of occupancyRequired

    New construction and commercial occupancy inside San Antonio city limits.

    • For new construction, inspections are completed before a letter of completion is issued.
    • Individual tenant finish-outs require permits, inspections, and a certificate of occupancy for each lease space based on the approved use.
    • An existing building with no occupancy-classification change generally does not require a new certificate, except for certain local physical occupant changes.
    “Yes. Section 110 of the 2018 IBC states that no building or structure shall be used or occupied until the building official has issued a Certificate of Occupancy. For new construction the process is the same. Once inspections are completed on shells, a letter of completion will be issued. Individual tenant finish outs should obtain permits and inspections and Certificate of Occupancy issued on each lease space based on the approved use.”
  • Local zoningPresent

    Land inside San Antonio city limits; the city has and administers zoning districts through its Unified Development Code.

    • The Unified Development Code contains city zoning districts and supplemental use regulations.
    “The Zoning Section of the Development Services Department provides a permitted uses list that describes each zoning district.”
  • Zoning districtsPublished

    Zoning districts and permitted uses inside San Antonio city limits.

    • The city's Development Services Department provides a permitted-uses list describing each zoning district.
    • The Unified Development Code is maintained online by the official code publisher.
    “The Zoning Section of the Development Services Department provides a permitted uses list that describes each zoning district. For more assistance, contact Zoning at 210.207.1111.”
  • Mandatory utility hookupSewer (with conditions)

    Manufactured-home and recreational-vehicle parks inside San Antonio city limits.

    • All sewer lines must connect either to the public sewage system or to a private sewage disposal system approved by the director of health.
    • This verified rule is specific to manufactured-home and recreational-vehicle parks, not a general rule for every new single-family home.
    “All the sewer lines shall be connected to the public sewage system or a private sewage disposal system approved by the director of health. Individual sewage drains from manufactured homes to the park service connections shall comply with the utilities standards of this chapter.”
  • Building in a floodplainRequired

    Proposed development on a site within the regulatory 100-year FEMA floodplain inside San Antonio city limits.

    • A Flood Plain Development Permit is required for development within the regulatory 100-year FEMA floodplain.
    • Restrictions and regulations may be placed on the permit to ensure compliance with federal standards.
    • The permit may be obtained online or at the Development Services One Stop Center.

    regulatory floodplain: 100-year FEMA Flood Plain

    “A Flood Plain Development Permit (FPDP) is a permit which federal law mandates be completed when the proposed development is located on a site within the regulatory 100 year FEMA Flood Plain. Restrictions and regulations may be placed on the actual permit to ensure compliance with the federal standards. It may be obtained online or at the DSD One Stop Center located at 1901 S. Alamo, San Antonio, Texas 78204.”
  • Permit feesPublished

    Manufactured-home park plans and amendments inside San Antonio city limits.

    • The cited fees are for manufactured-home park plans, not a universal fee for all residential building permits.

    manufactured home park plan fee: 600 USD per plan · manufactured home park plan amendment fee: 400 USD per amendment

    “Manufactured Home Park Plan Fee $600.00/Plan Manufactured Home Park Plan Amendment Fee $400.00/Amendment”
  • Permit processPublished (with conditions)

    Building-permit process inside San Antonio city limits.

    • Applications may be submitted at the Development Services location or, for some permits, through the online permitting system.
    • Conditional or partial permits may be available if approved by a Development Services engineer.
    • Inspections must be scheduled through the city phone or online system.
    “Yes, if approved by a DSD Engineer. See Information Bulletin 125 (PDF). You can submit the application to the City which will be reviewed to determine if a Partial or Conditional Permit may be granted.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask San Antonio or Bexar County directly.

  • Owner-builder exemption — Owner-builder exemption for construction inside San Antonio city limits.
  • Minimum dwelling size — Minimum dwelling size inside San Antonio city limits.
  • Minimum lot size — Minimum lot size inside San Antonio city limits.
  • Setbacks — General residential setbacks inside San Antonio city limits.
  • Lot coverage — Lot coverage inside San Antonio city limits.
9 more unanswered
  • Building height
  • Tiny homes
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Agricultural exemption
  • Subdividing land

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.

Unanswered questions are usually a sign that San Antonio publishes no rule on the point, not that none exists. Bexar County’s page lists the county offices to call.

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