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When a permit is required
Permit triggers and exempt work for Zavala County
No public countywide general building permit requirement was found for ordinary building construction in unincorporated Zavala County. The county publicly posts an OSSF/septic permit program for new installation and modification. The county Utility Department lists an electrical permit. County subdivision plat approval is required for regulated subdivision activity under the county's active subdivision rules.
- OSSF: owner and property information, water source, structure and bedroom data, site evaluator, designer, and installer information, soil evaluation, site evaluation information, calculation sheet, and inspection materials
- Subdivision plat application: all supporting documents required by active county subdivision regulations, including utilities and wastewater information, floodplain identification, tax certificates or similar tax-status documentation, and related plat-supporting materials
- Building code
- No public Zavala County adoption of a countywide general building code was found. OSSF materials expressly reference compliance with the county's OSSF rules and Texas Administrative Code Chapter 285. Utility materials reference local codes and NEC-style requirements for service equipment installation.
- Permit validity
- OSSF license runs with the land and should be kept by the owner and passed to the next owner.
- Contractor requirements
- OSSF forms require licensed or registered roles such as site evaluator, designer, installer, or designated representative where applicable under state and local OSSF practice.
Application process
Application → plan check → issuance → inspection → final
- 01 Confirm the parcel is in unincorporated Zavala County rather than inside Crystal City.
- 02 If the project needs an on-site sewage facility (OSSF), use the county OSSF forms. Complete forms for owner and site data, water source, structure information, site evaluator, designer, and installer information.
- 03 Complete the related OSSF site-evaluation, calculation, and inspection forms as applicable. The county packet includes a county approval/license form showing that a permit to operate is granted after successful inspection of the installed system.
- 04 If the project needs a county utility electrical permit, coordinate with the Utility Department regarding single mobile home overhead service and local code / NEC style service-installation conditions.
- 05 If the project creates a subdivision, submit the subdivision plat application and required supporting materials to the Office of the County Judge.
- 06 Before filing subdivision work, recheck the county website because the county posted a public hearing notice for proposed Subdivision and Manufactured Home Rental Community Regulations to be considered on February 4, 2026.
- 07 Wait for county review and any required inspections before starting the regulated work.
Required inspections
Scheduling and sequence
- Inspection hours
- Monday-Friday, 8:00 AM to 12:00 PM and 1:00 PM to 5:00 PM
Typical sequence: OSSF: site evaluation, design/calculation materials, installed-system inspection findings, and county approval/license after successful inspection. Utility electrical permit materials post service-installation requirements for a single mobile home overhead service. Subdivision: plat application reflects county application review through the County Judge / county process.
Frequently asked
Common questions about unincorporated Zavala County permits
01 Do I need a building permit in unincorporated Zavala County, TX? ▸
02 How do I apply for a building permit in unincorporated Zavala County, TX? ▸
Educational reference. Permit rules and fees change — confirm current requirements directly with Zavala County Utility Department; County of Zavala On-Site Sewage Facilities Department; Office of the County Judge before applying. Jaspector is not legal advice.