Here’s a Simple Way to Add A Shelf in the Cabinet Under Your Kitchen Sink for Additional Storage | Tips

Build a simple shelf from one by eight or one by ten pine. First, cut a long horizontal piece, slightly shorter than the width of the cabinet. Then cut two vertical legs to attach to either end. Now, slide the shelf into the cabinet and make a mark on it where it butts up against the p-trap and/or the drainpipe. Finally, use a jigsaw to notch the shelf so it fits around the plumbing.  By adding another level to this cabinet you’ve effectively doubled it’s storage capacity.