Egress Inc did a beautiful job at $2837. Since the room already had a door, closet, and CO detector it is now a "conforming" 3rd bedroom. Thanks to Daniel: since the kitchen and bath were already perfect, and most windows upgraded to Marvin double-pane wood, it seemed fair to do this bedroom next. And thanks for all the other great answers in this set. If there were a way to mark the whole thread "best", I would.