ADU Rules in San Antonio, TX — 2026 Guide
Check if your San Antonio property qualifies for an ADU in 20 seconds
San Antonio ADU Rules at a Glance
San Antonio has limited ADU support. Here is what you need to know.
- San Antonio allows "accessory apartments" in most single-family zones.
- ADU limited to 600 sqft or 35% of the primary dwelling — whichever is less.
- Owner-occupancy required on the primary dwelling.
- Separate utility meters may be required for rental ADUs.
What ReadyPermit Checks for San Antonio Properties
Enter any San Antonio address and get an instant ADU feasibility analysis covering:
Zoning Compliance
Verify your San Antonio lot is zoned for ADU construction under current TX and local rules.
Setbacks & Coverage
Check required setbacks, lot coverage limits, and height restrictions for your specific parcel.
ADU Size Limits
Calculate the maximum ADU square footage allowed based on your lot size and primary dwelling.
Permit Requirements
Understand what permits and approvals San Antonio requires before you can break ground.
Flood & Hazard Zones
Identify if your property falls in a flood zone, fire zone, or other hazard overlay.
Lot & Parcel Data
Pull parcel boundaries, lot dimensions, and existing structures from county records.
Check Your San Antonio Property Free
Enter your address below. In under 20 seconds you will know if your San Antonio lot qualifies for an ADU — no phone calls, no waiting.
No credit card required. Instant results.