Corner floating shelves use the dead space in room corners and create a design feature out of an awkward area. Here is how to build and install them.
Two Approaches
Simple Triangular Shelf
A triangular shelf that spans two walls is the simplest option. Cut a right-angle triangle from 3/4″ plywood (e.g., 12″ x 12″ at the walls). The two short sides attach directly to the walls with hidden L-brackets or cleats. No visible hardware from above.
True L-Shape (More Impressive)
Two shelf panels that meet at a 90° corner, each with its own hidden cleat. The joint between the panels is mitre cut at 45° for a seamless look. More complex but dramatically better looking.
Key Measurement Tip
Corners are almost never exactly 90°. Before cutting anything, measure your corner angle with a digital bevel gauge or a piece of cardboard folded into the corner. Most corners are 89° or 91° — adjust your mitre cuts accordingly.
