Setbacks & Height Limits in San Antonio

This guide explains the basic setback and height rules that apply to residential construction in San Antonio. These numbers come from Chapter 35 of the San Antonio Unified Development Code (UDC) and depend on your exact zoning district, overlay zones, and lot geometry, so always confirm with the City of San Antonio Development Services Department before finalizing plans.

What Are Setbacks?

A setback is the minimum required distance between a building and a lot line. Setbacks are measured from the property line to the nearest point of the building (typically the wall, but eaves, bay windows, and chimneys can have their own rules).

San Antonio's Unified Development Code specifies front, side, and rear setbacks separately for each zoning district in Chapter 35. Corner lots have two "front" setbacks (one per street frontage) and typically one interior side and one rear.

Typical Residential Setbacks

San Antonio's most common single-family residential zones have the following minimum setbacks:

Corner lots in residential districts typically require a 15 ft setback from the side street. Higher-density zones (RM-4, MF-25, MF-33), mixed-use zones, and commercial zones each have separate setback schedules in the UDC.

Height Limits

Maximum building height in San Antonio single-family residential zones is 35 feet, measured from average grade to the highest point of the roof. Multi-family RM-4 allows up to 45 feet, and commercial zones range from 35 ft (C-1) to 65 ft (C-3).

Height rules get more complicated in:

• River Improvement Overlay (RIO) — additional height step-downs near the San Antonio River
• Historic districts and the Office of Historic Preservation — height may be capped to match contributing structures
• Mission Protection Overlay — protects views around the UNESCO World Heritage missions
• Camp Bullis / military lighting overlays — restrict building height and exterior lighting
• Airport Hazard Overlay (AHOD) — limits height near San Antonio International Airport

Lot Coverage and Impervious Cover

Beyond setbacks and height, two other numbers shape how much you can build:

• Maximum lot coverage — the percentage of the lot covered by buildings. San Antonio residential zones generally allow around 40–50%.
• Impervious cover — total area of buildings, driveways, patios, and other hard surfaces. The UDC and the city's stormwater rules can limit total impervious cover, especially over the Edwards Aquifer Recharge Zone on the north side of the city.

San Antonio does not generally apply Floor Area Ratio (FAR) to single-family residential districts, but it does apply FAR to some mixed-use and form-based districts.

Common Exceptions and Encroachments

The Unified Development Code allows certain features to project into required setbacks. Typical allowances include:

• Eaves and gutters (usually up to 2 ft)
• Chimneys (up to 2 ft)
• Uncovered porches, stoops, and steps
• Air conditioning condensers (subject to sound limits)
• Bay windows (limited projection)

Fences, retaining walls, and accessory structures (sheds, garages, ADUs) have separate setback rules in Chapter 35 — typically allowing reduced rear and side setbacks for detached accessory buildings.

State ADU Overrides

If your project is an Accessory Dwelling Unit (ADU), note that Texas does not have a statewide ADU law that overrides local zoning. San Antonio adopted local ADU provisions in 2018 through its UDC, and those local rules govern setbacks, size, and parking. See the ADU rules page for details.

Edwards Aquifer Recharge Zone

A large portion of north and northwest San Antonio sits over the Edwards Aquifer Recharge Zone, where impervious cover limits and water-quality requirements apply in addition to standard zoning. If your lot is in this area, expect additional review by the Texas Commission on Environmental Quality (TCEQ) and the Edwards Aquifer Protection Program.

How to Look Up Your Specific Requirements

1. Find your zoning district — use the official San Antonio zoning map through Development Services
2. Read the district regulations — Chapter 35 of the UDC lists setbacks, height, lot coverage, and special standards by district
3. Check for overlays — RIO, historic, military, airport, and aquifer overlays modify the base rules
4. Ask Development Services — call (210) 207-1111 for zoning verification before you commit to design

Variances

If your project cannot meet the strict letter of the UDC, you may apply to the Board of Adjustment for a variance — a formal request to deviate from the rules based on hardship specific to your lot. Variances are discretionary and require public notice. See the Variance Application Guide for the general process.

Official Sources

See the sources linked in the frontmatter for the San Antonio Unified Development Code and the Development Services Department. This guide is informational and is not a substitute for direct confirmation from city planning staff.

Disclaimer: Zoning rules change. Always verify current setback, height, and lot coverage requirements with the City of San Antonio Development Services and the Unified Development Code before making design or construction decisions.