In Maywood, the city's Building Division issues building permits, and it requires them for all new construction and in most cases for modifications, replacements and remodeling. We start every job by checking which office covers your address, since each city around here runs its own building department, and when your job calls for a permit we take care of that step with the city before work starts, so the permit sets the earliest start date. The city also checks that contractors hold a valid state license and the required workers' compensation insurance, and it fines both the owner and the contractor when a required permit is missing, so ask any contractor you're considering about both, and about Maywood's own business license.
Price and schedule here mostly come down to what's already over your ceiling. How many inches are up there, whether the old material is soaked or full of droppings and has to come out first, how many gaps need sealing, and how easy the attic is to get into all move the price, while removal and any permit wait move the schedule. On close-set lots we also plan where the truck parks and how the hose reaches your attic, the same as we do in Monterey Park, and your own figure comes from the estimate.