Calcasieu Parish requires a permit before any construction or remodeling, but its list names re-roofing and not insulation, so it doesn't settle whether a blown-in job needs one. Inside the city, the Lake Charles Permit Center answers permit questions about work on your property at 337-491-1294. We check with the city or parish office that covers your address, and if your job needs a permit, we apply for it and keep you posted.
State rules say home improvement work over $7,500 and up to $50,000 has to be bid or done by a registered or licensed contractor, so ask anyone quoting your attic about that. If a job reaches $50,000 or turns up framing that needs structural repair, it has to be bid and done by a licensed Residential Building Contractor.
Many of the attics we open around here have a few inches of old, packed-down fill, ductwork across the floor and open gaps around lights and the hatch. We see the same thing in Sulphur and Moss Bluff, and we do the same careful work there.