San Marcos building & ADU permits
Recent permit activity, updated continuously.
San Marcos sits on the Austin–San Antonio corridor and has been among the fastest-growing college towns in Texas. Its permit layer carries a true land-use field — single family, duplex, townhouse, multi-family — so residential work is identified from the source rather than inferred, with ZIPs reverse-geocoded from each permit's point.
Igni is tracking 197 residential and building permits in San Marcos, TX. The most active ZIP is 78666. The most recent filing Igni tracked was Aug 14, 2026. All records come from City of San Marcos GIS (ArcGIS), an official government open-data feed, and are refreshed continuously.
197
Permits tracked
0
ADU permits
1
Distinct ZIP codes
Aug 14, 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 |
|---|---|---|---|---|
| 78666 | Residential | — | — | Jun 1, 2026 |
| 78666 | Residential | — | — | Jun 2, 2026 |
| 78666 | Residential | — | — | Jun 2, 2026 |
| 78666 | Residential | — | — | Jun 2, 2026 |
| 78666 | Residential | — | — | Jun 2, 2026 |
| 78666 | Residential | — | — | Jun 2, 2026 |
| 78666 | Commercial | — | — | Jun 2, 2026 |
| 78666 | Residential | — | — | Jun 2, 2026 |
| 78666 | Residential | — | — | Jun 3, 2026 |
| 78666 | Residential | — | — | Jun 3, 2026 |
| 78666 | Residential | — | — | Jun 3, 2026 |
| 78666 | Residential | — | — | Jun 3, 2026 |
| 78666 | Residential | — | — | Jun 4, 2026 |
| 78666 | Residential | — | — | Jun 4, 2026 |
| 78666 | Residential | — | — | Jun 4, 2026 |
| 78666 | Residential | — | — | Jun 4, 2026 |
| 78666 | Residential | — | — | Jun 4, 2026 |
| 78666 | Residential | — | — | Jun 4, 2026 |
| 78666 | Residential | — | — | Jun 4, 2026 |
| 78666 | Residential | — | — | Jun 4, 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.
Data source
Sourced from City of San Marcos GIS (ArcGIS). Public records (TX PIA).
Nearby cities — Texas
Learn more about ADUs & building permits
Background reading on accessory dwelling units, building permits, and how Igni turns San Marcos permit records into leads.
San Marcos 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.