Unincorporated permits run through Building & Safety. Cities (Oxnard, Thousand Oaks, Simi Valley, Camarillo, etc.) operate their own desks. Coastal and fire-hazard overlays apply in defined 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.