It takes about nine square feet of floor space to swing open a typical 3-foot-wide door. That’s a big chunk of real estate, particularly in a small space like a powder room. For tight quarters, consider the space-saving pocket door, which slides efficiently into a wall.  When using a pocket door for a renovation project you have to remember that the wall it slides into has to be free of wires, pipes, ducts, and other obstructions.