Bexar County primarily regulates development in unincorporated areas, while the City of San Antonio and other municipalities maintain exclusive jurisdiction over their respective city limits. Development in unincorporated areas is subject to county subdivision regulations and flood plain management, while municipal projects must adhere to specific city zoning and building codes.
How this fits with the state
The state authority here is Texas Department of Licensing and Regulation; Texas State Board of Plumbing Examiners. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.