My room is 15 X 30 but I have a LA in it. My suggestion, don't have too many doors to break up the space and keep the windows high enough to put storage or workspace under them. I live in a house over 100 years old and have 3 big windows and 3 doors to contend with. Still I know I have more space than a lot of people and I'm very happy with having the room,just if I could build I would do it differently.