Travis County, TX zoning, setbacks & lot buildability

County seat: Austin

Travis County pairs Austin's dense zoning code with unzoned county land governed by subdivision, water quality, and septic regulation.

Common Travis County residential zoning districts

DistrictTypical nameTypical minimum lot size
SF-2Single-Family Standard Lot (Austin)~5,750 sq ft
SF-3Family Residence (Austin)~5,750 sq ft
SF-1Large Lot Single-Family~10,000 sq ft
UnzonedUnincorporated countyOSSF-driven

Typical setbacks: 25 ft front, 5 ft side, 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

Austin Water plus several MUDs and WCIDs; western county tracts use wells and aerobic septic.

Topography & slope

Flat east of I-35, steep Hill Country slopes of 15%+ to the west.

Flood & drainage

Barton Creek and Colorado River corridors, plus Save Our Springs water-quality zones limiting impervious cover.

What kills Travis County deals

  • Impervious cover limits in water-quality zones can cap the buildable footprint far below the setback envelope.
  • Heritage tree protection can force a redesign on infill lots.

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 Travis 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.