Incorporated cities like Chico and Oroville manage their own building permits. The County Department of Development Services handles permits for unincorporated areas. Butte County has significant wildfire risk, leading to specific fire-safe building requirements and reviews in many areas.
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.