Texas counties have not been given general zoning authority by the state Legislature. Williamson County does not deal with as many issues related to site plans or building permits in unincorporated areas.
For residents in unincorporated areas of Travis County, building and development permits are required for any manmade changes to real estate, including structures; driveways; septic systems; or mining, dredging, filling, grading, paving, excavating, drilling or division of land.
Austin Development Services Department: 512-978-4000
Travis County Permit Office: 512-854-4215