How to Build Storage Shelves Under Stairs
Take advantage of unused space under the basement stairs with these inexpensive (and DIY!) storage shelves.
Our staircase storage design gives you storage spaces of different sizes, including a tall narrow box for items such as brooms or skis. The boxes are so quick and easy to build that you'll have no trouble adapting them to your storage needs as well as to the size and pitch of the space under your stairs.
The boxes shown fit under a staircase with a 45-degree pitch: For every 12 inches the stairs rise, they run (travel horizontally) 12 inches. The boxes step up and over in 12-inch increments. If your stair slope is more gradual, your boxes will need to be wider to fit; more steep and the boxes will be narrower. To find out, hold a tape measure vertically with the hook on the floor. Move the tape along the bottom of the stair until the distance to the floor is 36 inches. Use a 4-foot level to make sure the tape is plumb, then mark the point on the floor. Measure from the floor mark to the point where the bottom of the stair meets the floor. Let's say the distance is 46 inches. Divide 46 by 3 to get 15-5/16 inches. Now you know your small boxes and tall box need to be 15-5/16 inches wide while your large boxes should be 30-5/8 inches wide.
These boxes are built for utility, not beauty. They are made from inexpensive particleboard without finish, although you can paint them for a more attractive look. One word of caution: Don't build the boxes with particleboard if your basement is damp. Particleboard readily absorbs moisture that makes it swell, and it will crumble if it gets wet. Use CDX plywood instead. This inexpensive grade of plywood, intended for exterior sheathing, is made with water-resistant glue.
Expect to spend about 4 hours building the shelves. Before you begin, measure the slope of the stairs, assemble tools and materials, and prepare a work area.