cost to build a closet in a bedroom
1 If the existing room configuration allows a closet to be installed without new side walls, the cost for a simple reach-in closet (with no lighting) drops to $1,000-$3,000, depending on the style and number of doors and other features. In some municipalities, a room must have a closet to be considered a bedroom. 2  Some developers create an office or den room without a closet to avoid extra building fees; check with the local planning department to see if you might have to pay extra when adding a closet to a room that doesn't have one.