Easy Ways to Expand Your Closet Space - Closet Nook Shelves - Wire shelves are available in a variety of widths. Measure the width and depth of the space. Then choose the correct shelving and ask the salesperson to cut the shelves to length for you. Subtract 3/8 in. from the actual width to determine the shelf length. Buy a pair of end mounting brackets and a pair of plastic clips for each shelf.