A walk-in closet can range anywhere from 4 x 4 feet to 7 x 10 feet, depending on the factors above. Smaller walk-in closets can be designed within a 25 sq ft space, while a master walk-in closet is generally larger, with a minimum size of 7' x 10' or 70 sq ft. Walk-in closets were once considered a luxury but are becoming more mainstream as people prioritize organization space and having time to themselves to get ready. To design your own walk-in closet, you’ll need to understand the dimensions of different storage options and clearance space and can arrange your closet based on these.