Putting up a shop in CA - fire department being a pain

I have seen small, isolated fires that the fire department destroyed the entire home, kicking in doors, breaking all the windows and cutting holes in the roofs. The water damage is worse than the fire damage. I do agree with you on sitting down with the zoning and fire personal and try to work things out.
Just three days ago, we worked a house fire that appeared to have originated from HVAC wiring in the attic. Flat roof with about 16" of space between the interior ceiling and roof. The fire was still small, but making a run in the attic space. We HAD to pull lots of ceiling and cut the roof to gain access and spray water on the fire. Yes, the fire was small and isolated to the attic, but if we didn't do what we did, the entire house would've burned down. Guaranteed 100%.