A pocket door doesn't just save space—it can solve problems, particularly in tight spots. For example, a pocket door might be used in a small half-bath that simply doesn't have enough space for an in-swinging door and where an out-swinging door would be awkward. There, use of a pocket door could circumvent building an unnecessarily large bathroom or stealing space from an adjacent closet or similar area.
Another typical spot for a pocket door is where there is space for a regular door to swing but where it would be in the way when open. This situation is common in bathrooms, closets, and laundry rooms. Almost anywhere an open door becomes an obstacle, a pocket door makes sense.
For a large, double-wide doorway between two rooms—a dining room and living room, for example—a pair of pocket doors can be a very elegant, practical addition. (Pocket doors have been used in this type of setting since the turn of the century.)
When open, as such doors usually are, pocket doors don't clutter or obstruct the area around the doorway.