Bexar County, TX zoning, setbacks & lot buildability

County seat: San Antonio

Inside San Antonio city limits, zoning applies; in unincorporated Bexar County there is no zoning, and platting plus OSSF rules control development.

Common Bexar County residential zoning districts

DistrictTypical nameTypical minimum lot size
R-4Residential Single-Family (city)~4,000 sq ft
R-6Residential Single-Family (city)~6,000 sq ft
RPResource Protectionlarge-tract / conservation
UnzonedUnincorporated countydriven by OSSF sizing

Typical setbacks: 20–25 ft front, 5 ft side, 5–10 ft rear. LotAnalyst subtracts the applicable setback envelope from the parcel geometry to show the actual buildable footprint rather than the raw lot size.

Water, sewer & septic

SAWS serves the metro; outlying tracts rely on well and septic sized by soil class.

Topography & slope

Flat on the south and east sides, rising into Hill Country grades of 10–20% on the north and northwest.

Flood & drainage

Flash-flood-prone creek corridors; the Edwards Aquifer Recharge Zone adds impervious-cover limits.

What kills Bexar County deals

  • Edwards Aquifer Recharge Zone parcels need a TCEQ water pollution abatement plan before construction.
  • Unzoned county land can still be blocked by ETJ platting rules and septic sizing.

Statewide Texas rules that also apply

  • Counties generally cannot zone; unincorporated land is governed by subdivision and OSSF rules.
  • Cities regulate land within their extraterritorial jurisdiction (ETJ) through platting.
  • OSSF permits are issued by the county or an authorized agent under TCEQ rules.
  • Groundwater conservation districts may limit or permit well production.

See the full Texas land feasibility guide

See what a finished report looks like

Every Bexar County analysis returns the same structure: zoning and minimum-lot-size check, setback envelope, USGS 3DEP slope profile, septic/sewer feasibility, flood and buffer flags, and acquisition underwriting. Here is a full worked example.

View the sample reportSee pricing

Figures on this page are typical ranges compiled from published ordinances and public data for orientation only. Districts, overlays, and setbacks change — always verify the governing zoning district, minimum lot size, buffers, and septic requirements with the county planning office and health department before you buy or build. Read the full disclaimer.