1247 Pine St, Austin, TX 78702
City of Austin · Travis County · Texas
This invented example assumes potential for a 3-story duplex up to 3,200 sf and no mapped flood constraint. Verify local rules and site conditions for a real project.
Nine factors
8 clear · 1 to watch
Zoning, Clear.By-right for 2 dwelling units. Administrative review — no council hearing.
SF-3 (Single-Family Residence 3). §25-2-491. Permitted uses include single-family, two-family, and residential ADU (per §25-2-774).
City of Austin Land Development Coderetrieved view record (opens in a new tab)
Flood, Clear.No flood risk. No insurance required, no elevation certificate.
FEMA Flood Zone X (minimal risk). Not in a Special Flood Hazard Area; none of the lot lies inside one.
FEMA National Flood Hazard Layerretrieved view record (opens in a new tab)
Seismic, Clear.Very low seismic risk. Standard IBC design applies.
USGS design maps, Risk Category II, Site Class D: PGA 0.05g, Seismic Design Category A.
USGS Seismic Design Mapsretrieved view record (opens in a new tab)
Wildfire, Clear.Low wildfire hazard at the parcel.
USFS Wildfire Hazard Potential at the parcel: low (class 2 of 5).
USDA Forest Service Wildfire Hazard Potentialretrieved view record (opens in a new tab)
Radon, Clear.Low radon zone. No mitigation required by code.
EPA Radon Zone 3 (predicted average indoor radon < 2 pCi/L). Passive mitigation stubs recommended per ASTM E2121 as best practice, not required.
EPA Map of Radon Zonesretrieved view record (opens in a new tab)
Soil, Watch.Expansive clay. Plan for an engineered slab; a structural engineer designs it.
Houston Black clay, 0 to 1 percent slopes (SSURGO map unit). Dwellings without basements: somewhat limited (shrink-swell). Moderately well drained.
USDA SSURGOretrieved view record (opens in a new tab)
Terrain, Clear.Flat lot. No slope hazard.
Slope 2.4% at the lot. Elevation 486 ft at the lot center.
USGS 3DEP elevationretrieved view record (opens in a new tab)
Utilities, Clear.Mapped streets and power at the lot, so service is likely at the frontage. Confirm taps with the utility.
6 mapped streets within 250 m and an overhead power line within 400 m.
OpenStreetMap (Overpass)retrieved
Lot shape, Clear.Regular rectangle with 50 ft of street frontage. Nothing about the shape limits a duplex.
Lot 50 × 137 ft (6,850 sq ft), four sides, no flag or easement strip on the county record.
County parcel recordretrieved
Buildable envelope
- Height cap
- 35 ft
- FAR
- 0.50
- Setbacks (F / R / S)
- 15 / 5 / 5 ft
- Max GFA
- 3,425 sf
- Buildable footprint
- 2,150 sf
- Units permitted
- 2