Building permits, zoning and land rules in unincorporated Bexar County, Texas

Unincorporated Bexar County does not require a building permit for an ordinary single-family home; residential permitting is voluntary¹. Without a voluntary residential permit, the county has no authority to inspect the home or issue a residential Certificate of Occupancy⁸. Voluntary residential permitting requires structural-frame, electrical, plumbing and HVAC inspections during construction; the county will not inspect a completed home after the fact². Commercial, public-accessible and multifamily buildings with 4 or more dwelling units require a building permit, preceded by a Building Permit Authorization from Public Works¹. Commercial and public-building inspections include applicable fire-resistant structural framing, electrical and HVAC rough-ins, and a final inspection for the Certificate of Occupancy⁵.

The Bexar County Fire Marshal’s Office handles covered building permits at 9810 Southton Road, San Antonio, TX 78223, phone 210-335-0300⁵. Public Works handles Building Permit Authorizations, driveway/right-of-way permits and floodplain development permits at 1948 Probandt St., San Antonio, TX 78214, phone 210-335-6700³. Covered building-permit fees follow an escalating construction-cost schedule, include required inspections and the final Certificate of Occupancy, and use a minimum construction-cost basis of $25 per square foot; ask the Fire Code Section for the project’s fee¹¹. Municipal building-permit authority applies inside San Antonio¹², Live Oak¹³, Castle Hills¹⁴, Shavano Park¹⁵, Town of Hollywood Park¹⁶, Elmendorf¹⁷. Septic permitting remains with Bexar County Environmental Services, and Elmendorf also publishes local septic-installation requirements^4,18.

Unincorporated Bexar County outside San Antonio’s Military Protection Area is not zoned for a specific land use; San Antonio has land-use authority in that designated area³. Municipal zoning applies inside San Antonio¹², Converse¹⁹, Live Oak²⁰, Fair Oaks Ranch²¹, Leon Valley²², Helotes²³, Kirby²⁴, Windcrest²⁵, Castle Hills²⁶, Shavano Park²⁷, Town of Hollywood Park²⁸, Elmendorf²⁹. Bexar County Environmental Services handles countywide septic permitting, while municipal wastewater requirements may also apply^4,18. On ordinary unincorporated land, the county sets no minimum lot size, dwelling size or setback⁵. Dividing unincorporated property generally requires a subdivision plat, subject to state-law exceptions; ask Public Works which rule applies to the tract⁷.

Bexar County allows an on-site sewage facility to treat and dispose of wastewater on the same property, but the system must satisfy county permitting and inspection rules⁴. Sites without public sanitary sewer need an OSSF permit from Bexar County Environmental Services, the county's TCEQ-authorized agent^4,30. A permit covers a new system, repair or alteration, renewal, or an existing unpermitted system under the applicable requirements⁴. County inspections verify installation at required stages⁴. Only 5.7% of Bexar County soils are free of severe limits for a conventional drain field, so arrange the site evaluation before settling on a house location or wastewater budget¹⁰. Texas has a conditional 10-acre septic exemption, but Bexar County requires all OSSFs to be permitted; do not assume acreage waives county approval^4,31. In the Edwards Aquifer Authority's jurisdiction, separate well registration or permitting rules may also apply³².

Unincorporated Bexar County outside San Antonio’s Military Protection Area sets no county zoning restriction on RV occupancy, tiny homes, manufactured homes, accessory dwellings or temporary camping on your own land⁶. Deed restrictions, HOA covenants and other laws can still limit those uses³. Off-grid wastewater disposal must meet county OSSF permitting and inspection rules⁴. A lender or HOA seeking a residential Certificate of Occupancy makes advance planning essential: the voluntary permit and required inspections must precede completion².

1. Confirm whether the parcel is unincorporated, inside a city limit, or in a San Antonio Military Protection Area, because the responsible land-use authority changes by location³.

1. For an ordinary single-family home, decide before construction whether a lender or HOA makes a voluntary permit and Certificate of Occupancy useful².

1. If public sanitary sewer is unavailable, obtain OSSF authorization from Environmental Services before installing the wastewater system^4,30.

1. Get the appropriate driveway approval from Public Works for a county road or from TxDOT for a state highway^3,33.

1. Ask Public Works for floodplain review before construction on property with or within 100 feet of a FEMA floodplain; covered development requires a floodplain development permit³⁴.

1. If the tract will be divided, ask Public Works whether a state-law exception applies before commissioning the generally required subdivision plat⁷.

Confirm whether the parcel is inside a city limit or a San Antonio Military Protection Area before relying on the county's unincorporated no-zoning answer³. Ask whether a recent tract division received required plat approval or qualified for a state-law exception⁷. Bexar County requires floodplain review for construction on property with or within 100 feet of a FEMA floodplain, and covered development needs a floodplain development permit³⁴. A new business in an existing unincorporated structure, or a changed business use, requires a Change of Occupancy application, inspection and compliant Certificate of Occupancy before opening⁹. The typical effective property-tax rate is about 1.8%, the median annual bill is about $4,429 and the typical home value is about $257,364¹⁰. Existing nursery and agricultural operations conducted as a main or accessory use are exempt from the county Storm Water Quality Site Development Permit; that exemption does not waive unrelated building, septic or floodplain requirements³⁵.