I used Lois Hallock's book mentioned in the post above as a guide when DH and his friend finished off a part of the basement over six years ago to create a wonderful sewing space for me. It is 15 by 24 feet at one end. The other end is like a TV/stereo area along (so that DH could keep me company!) with a two-piece bathroom. The book was an invaluable aid in making use of what you already have before buying new things, and very good ergonomic information was given so that I could iron, cut and quilt at the frame without any discomfort. I love, love my studio!