Placer County is a large county with incorporated cities like Auburn, Lincoln, and Roseville, which manage their own building permits. The County Planning and Development Department handles permits for unincorporated areas. Specific overlays include wildfire hazard zones, flood zones, and areas with specific grading or environmental review requirements.
How this fits with the state
The state authority here is California Contractors State License Board. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.