Calcasieu Parish requires a permit before any construction or remodeling, but its list names re-roofing and doesn't mention insulation, so whether your job needs one isn't settled. For a Lake Charles address, the city's Permit Center issues permits and takes questions at 337-491-1294. Before work starts, we check with the office that covers your address. If the job needs a permit, we apply for it and keep you posted.
Appliance changes bring their own paperwork. The parish requires permits before anyone installs mechanical equipment or gas piping, so if sealing your attic means replacing a furnace or water heater up there, that part of the work will need its own permit before it goes in.
The calls we get here are usually about hot upstairs rooms, rooms over the garage, cold floors over a crawl space and old attic insulation that's been walked flat by other trades. We're based in Lake Charles and do the same work in the cities around it, including Sulphur and Moss Bluff.