In Commerce, building permits for every building and structure come from the city's Building and Safety Division, which also reviews plans and inspects the work, so if your job needs a permit, the start date waits on that step. Before anything else I check which office covers your address, and when a permit is called for, we take care of it with them before work starts. The city also requires every contractor doing business in Commerce to hold a city business license, even one based outside the city like us, and that's something you can check with the City of Commerce before you hire anyone.
Most streets here carry truck traffic from the warehouses, so we plan where our rig parks and how the hose reaches your attic hatch before the crew arrives. We're based right next door in East Los Angeles and do the same attic work on the older houses in Maywood. The price moves with how much insulation is up there now, whether old or dirty material has to come out first, how many gaps need sealing and whether foam makes sense, and the schedule turns mostly on removal and any permit. At the estimate I write down what your job needs and what has to come first.