Chico's Building Division issues building permits. Its list names alterations and repairs to non-residential buildings but doesn't mention insulation, so whether your job needs a permit isn't settled until someone asks the city. If it does need one, we handle the application and inspection, and I'll tell you which office covers your address.
Roofs need extra care here. Chico has its own re-roof permit, and re-roofing means replacing any dry rot or fungus-damaged wood, so an insulation plan tied to a reroof should allow for deck repairs. If work starts without a required permit, an inspector issues a Stop Work Order, fees can reach triple the original amount and anything already covered has to be opened back up for inspection.
Outside city limits, Butte County handles building services for unincorporated areas such as Durham, Magalia, Forest Ranch and Cohasset. We work on both sides of that line, so I sort out which office applies to your building before anything gets scheduled.