I have four cased openings in a congested area between the garage entry and the kitchen: two on one side, right next to each other (opening to dining room without door, and opening to basement, with door), and two exactly opposite those (opening to utility room with door, and closet with door). This is a circus when we have family over. Doors need to be closed so others can open and people can pass, etc. So the question is --- what requirement, if any is there that I maintain a door to the basement staircase? The basement is a walkout, fully furnished media room, bedroom, bath, and shop and has a nine foot ceiling. Within the basement, the utilities (gas furnace and hot water) are in their own separate walled and doored space. I hope I can do away with the basement door, because if I can't my wife wants me to install bi fold doors, which I hate.