Rockwall County is highly incorporated, meaning the vast majority of building permits are issued and reviewed by individual city departments. The County Fire Marshal primarily oversees unincorporated areas and provides fire code inspections for commercial projects where municipal jurisdiction does not apply. Development in the county is subject to regional flood plain management regulations and specific municipal zoning ordinances.
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.