ADU rules in San Antonio, TX — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
San Antonio UDC §35-371 permits internal, attached, and detached ADUs by right in rural and residential districts. Detached ADUs max 800 sq ft (1,200 in RE zones). Owner must occupy main or ADU as permanent residence. Max 3 occupants in ADU. Building permit and recorded covenant required.
San Antonio UDC §35-371 allows ADUs by right in multiple residential and rural zoning districts. Detached ADUs: max 800 sq ft in standard single-family zones, 1,200 sq ft in RE (rural estate) zones. Attached ADUs: max 35% of the principal dwelling's total living area. Maximum 3 occupants in the ADU. Only one ADU per lot. The property owner must occupy either the main house or the ADU as their permanent residence (evidenced by voter registration, vehicle registration, etc.) and sign a notarized affidavit. A covenant must be recorded with the Bexar County Clerk. ADUs require the same roof pitch, siding, and window proportions as the principal residence. Minimum 5-foot setback from rear and side property lines. Utilities must connect through the principal structure's systems (electrical exception if over 100 linear feet). Building permit required through BuildSA Portal.
Unpermitted ADU: citation, correction required. Owner occupancy violation: covenant enforcement. Fine $100–$2,000.
San Antonio, TX
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Side-by-side rule comparisons with other cities in Bexar County.
See how other cities in Bexar County handle adu rules.
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