Pierce County Planning and Public Works manages permits for all unincorporated areas, while incorporated cities like Tacoma, Lakewood, and Puyallup maintain their own independent building departments. Development in unincorporated areas is subject to specific critical area regulations, including flood hazard zones, seismic hazard areas, and steep slope overlays that require additional geotechnical review.
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.