Calcasieu Parish requires permits before any type of construction or remodeling/renovations project. That doesn't say how it applies to an attic job, so we don't guess. Before work starts, 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. If you'd rather ask yourself, the City of Lake Charles Permit Center answers permit questions at 337-491-1294.
If your ductwork and AC unit sit in the attic, federal building research finds that moving the insulation and air seal up to the roof deck has particularly large advantages over insulating the attic floor and the ducts. Louisiana's code attaches two conditions. The heating and cooling system has to be properly sized or modified to current code, and any insulation between the sealed attic and your rooms has to come out.
We're based in Lake Charles and work in the cities around it, including Sulphur, Jennings and Orange, TX, plus areas like Moss Bluff and Prien. We see plenty of older houses with a thin, packed-down layer, and newer ones where the insulation is fine but the gaps were never sealed. The work is the same wherever the house is.