San Antonio's Building Setbacks & Zoning: The Rules That Matter

Every city handles building setbacks & zoning a little differently. In San Antonio, Texas, there are 3 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Setback Rules

San Antonio's setback requirements are established in UDC § 35-516. Standard residential setbacks include: front setback of 10–35 feet (with 20 ft minimum from sidewalk to garage entry), side setback of 5 feet minimum, and rear setback of 10 feet (garages and ADUs may have no rear setback). A 25-foot setback is required from high-pressure fuel lines. Projecting features may extend up to 5 feet into yards but not closer than 3 feet to property lines.

Key details: Code Section: UDC § 35-516. Front: 10–35 ft (20 ft to garage from sidewalk). Side: 5 ft minimum (3 ft for existing additions). Rear: 10 ft (garages/ADUs may be 0 ft). Fuel Lines: 25 ft from high-pressure oil/gas lines.

Building in setback: stop-work order and required correction. Fines $100 to $1,000. May require structure removal at owner expense.

Structure Height Limits

Building height in San Antonio is regulated by UDC § 35-517. Standard R-3 residential height limit is 35 feet / 3 stories. Non-residential structures may exceed the height limit if set back one foot from side and rear setback lines for every two feet of excess height. Accessory Detached Dwelling Units (ADDUs) are limited to 25 feet / 2 stories. The Board of Adjustment may grant special exceptions or variances for height.

Key details: Code Section: UDC § 35-517. R-3 Residential: 35 ft / 3 stories maximum. ADDU: 25 ft / 2 stories maximum. Height Bonus: 1 ft extra setback per 2 ft above limit (non-residential). Variances: Board of Adjustment may grant exceptions.

Exceeding height limit: stop-work order. Required to reduce height or obtain variance. Fines $250 to $2,000.

Lot Coverage Limits

San Antonio regulates lot coverage through the UDC. Accessory structures may cover a maximum of 50% of the total side and rear yard area, with total accessory floor area not exceeding 2,500 square feet in residential districts. Each lot must maintain at least 500 contiguous square feet of open space in the rear yard. Impervious cover is further restricted over the Edwards Aquifer Recharge Zone to 15% for residential development.

Key details: Code Section: UDC § 35-515 through § 35-517. Accessory Max: 50% of side/rear yard area. Accessory Floor Area: 2,500 sq ft max in residential districts. Open Space: Min 500 sq ft contiguous in rear yard. Aquifer Zone: 15% max impervious cover for residential.

Exceeding lot coverage: correction required. May need to remove impervious surface. Fines $200 to $1,000.

The Bottom Line

San Antonio's building setbacks & zoning rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming San Antonio is broadly strict or permissive.

These rules come from San Antonio's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.