The Williamson County Building Codes Department handles permits for all unincorporated areas of the county. Incorporated cities such as Franklin, Brentwood, Nolensville, and Spring Hill maintain their own independent building and planning departments for properties within their respective municipal limits. Development in unincorporated areas is subject to specific rural zoning standards and flood plain management regulations.
The county enforces a specific rural zoning ordinance that mandates strict architectural design standards and landscape buffers for new residential developments in unincorporated areas.
How this fits with the state
The state authority here is Tennessee Board for Licensing Contractors. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.
Source · Williamson County Building Codes DepartmentLast verified · 05 / 2026