Benton County manages building permits for unincorporated areas, while incorporated cities like Kennewick, Richland, and Pasco maintain their own independent building departments and permit processes. The county enforces specific overlays for flood hazard areas and critical areas, which may require additional environmental review during the permitting process.
Benton County enforces specific critical area ordinances that require additional review for projects located within designated floodplains or near sensitive riparian habitats.
How this fits with the state
The state authority here is Washington Department of Labor & Industries. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.
Source · Benton County Planning and Building DepartmentLast verified · 05 / 2026