In Azusa, permits come from the city's Building Official, and the city wants a building permit any time a structure is built, altered, repaired or torn down, with only a short list of exemptions. When your job needs one, the permit sets the start date, because we don't pour until it's issued. Before work starts, we check with the city or county office that covers your address, and when a permit is needed, we pull it and handle the paperwork. On your end, it's worth confirming that whoever you hire holds a California contractor license and a City of Azusa business license.
The price mostly turns on things you can't see from the curb: how much old concrete comes out, how far we haul from the truck to the backyard, whether the subgrade, the dirt the slab sits on, has to be dug out and rebuilt, and how fancy the finish gets. The schedule turns on the permit, the weather on pour day and the curing time before you can use the slab, and I'll give you your own number and timeline when I write the estimate. We do the same work up the hill in Glendora and out in Covina, Pasadena and Pomona, so if your yard sits on a slope, we've dealt with it before.