The county handles permitting for unincorporated areas, while incorporated cities like New Braunfels and Bulverde maintain their own building departments and zoning authority. Development in unincorporated areas is subject to specific county flood damage prevention regulations and onsite sewage facility (OSSF) permitting requirements.
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.