Usually, we discuss it at the estimate, but the normal procedure for us is to remove the faceplates, mask the floors with the tape, cover all floors with the drop sheets. Then we check all walls for visible damages, and everything we see with the naked eye. If the clients are more picky, we use a hand light, and check the walls more carefully for deeper, hidden damages. The final resort, when people want to see brand new walls, we offer a level 5 skim-coat with the drywall mud, then prime them, and finish with a thin, fine coat of paint, so the walls look brand new.