Home construction in Pico Rivera goes through the city's Building Division, and work like additions and alterations gets zoning review, plan check where the city reviews the drawings, or both before a permit is issued, so a job that needs one waits on that review before anyone starts. The city's list doesn't name insulation on its own, so before anything else I check what your address and your job call for, and when a permit is needed we take care of that step with the city before work starts. For its express permits, the city asks the contractor for an active California contractor's license and an active Pico Rivera business license, so those are fair things to ask anyone bidding your job.
Price and timing both turn on what we find up there: how much old insulation has to come out, how many gaps need sealing, and how tight the attic is to work in. The estimate puts that in writing, with what the job needs and what has to come first. We do the same work in Montebello and up in Alhambra, and the low attics with ductwork running through them look a lot like what we see here.