San Antonio building & ADU permits
Recent permit activity, updated continuously.
San Antonio, in south-central Texas, sets its own ADU rules in a state with no statewide mandate. Its issued-permit export is published under CC BY 4.0 (Igni shows the required © City of San Antonio credit) and includes a dedicated 'Res Accessory Dwelling Permit' type, which Igni uses to flag ADUs precisely.
Igni is tracking 4,064 residential and building permits in San Antonio, TX — including 5 classified accessory-dwelling-unit (ADU) filings. The most active ZIP is 78249. The most recent filing Igni tracked was Jul 31, 2026. All records come from data.sanantonio.gov open data (CSV), an official government open-data feed, and are refreshed continuously.
4064
Permits tracked
5
ADU permits
52
Distinct ZIP codes
Jul 31, 2026
Newest permit
Recent permits
A sample of the freshest permits in this jurisdiction — ZIP and city only (no street addresses).
| ZIP | Permit type | ADU type | Valuation | Applied |
|---|---|---|---|---|
| 78073 | Other | — | — | Jun 18, 2026 |
| 78227 | Other | — | — | Jul 30, 2026 |
| 78249 | Other | — | — | Jul 30, 2026 |
| 78228 | Other | — | — | Jul 30, 2026 |
| 78217 | Other | — | — | Jul 30, 2026 |
| 78238 | Other | — | — | Jul 29, 2026 |
| 78212 | Other | — | — | Jul 29, 2026 |
| 78249 | Other | — | — | Jul 30, 2026 |
| 78219 | Other | — | — | Jul 30, 2026 |
| 78247 | Other | — | — | Jul 30, 2026 |
| 78213 | Other | — | — | Jul 30, 2026 |
| 78247 | Other | — | — | Jul 30, 2026 |
| 78233 | Other | — | — | Jul 30, 2026 |
| 78232 | Other | — | — | Jul 30, 2026 |
| 78207 | Other | — | — | Jul 30, 2026 |
| 78227 | Other | — | — | Jul 30, 2026 |
| 78227 | Other | — | — | Jul 30, 2026 |
| 78258 | Other | — | — | Jul 30, 2026 |
| 78251 | Other | — | — | Jul 30, 2026 |
| 78249 | Other | — | — | Jul 30, 2026 |
Top ZIP codes by recent activity
Housing law — Texas
Texas has no statewide zoning or ADU mandate, so accessory-dwelling rules are set city-by-city; a 2025 statewide ADU-by-right bill did not become law. Austin's HOME reforms now allow up to three units on most single-family lots.
Reform is local: Austin's HOME initiative cut minimum lot sizes and allowed more units per lot, while 2025 state laws eased lot-size minimums and commercial-to-residential conversions.
San Antonio ADU rules
San Antonio permits accessory dwelling units — internal, attached, and detached — by right in many residential zoning districts under its Unified Development Code (Section 35-371). Texas has no statewide ADU mandate, so the city's local rules govern, and a 2022 package of nearly 200 UDC amendments (effective January 1, 2023) was designed in part to make ADUs easier to build.
A detached accessory dwelling is generally limited to 800 square feet or 50 percent of the primary structure's gross floor area, up to a maximum of 1,600 square feet in most single-family districts (and 1,200 square feet in the 'RE' district). One on-site parking space is required only when the ADU exceeds 800 square feet. Unlike many cities, San Antonio retains an owner-occupancy requirement: the owner must live in either the principal home or the ADU as a permanent residence, may not collect rent on the owner-occupied unit, and records an affidavit or covenant confirming residency — a rule the city reaffirmed in its recent amendments to keep ADUs as long-term housing rather than short-term rentals.
A code-compliant ADU requires an accessory dwelling permit and is handled through the building-permit process; the city's Information Bulletin 402 details the district-specific standards.
This is an informational summary — verify current rules with the city's planning/permitting department; not legal advice.
See also: Texas ADU law and what is an ADU?
Data source
Sourced from data.sanantonio.gov open data (CSV). CC BY 4.0.
Attribution: © City of San Antonio (CC BY 4.0)
Nearby cities — Texas
Learn more about ADUs & building permits
Background reading on accessory dwelling units, building permits, and how Igni turns San Antonio permit records into leads.
San Antonio permit data — FAQ
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Informational only, not legal advice. Headline counts reflect all permits Igni has tracked for this jurisdiction; the table shows recent activity. Housing law changes — verify current statutes before relying on this.