For square shelves, you'll need four pallet deck boards all the same length, whereas a rectangle shelf needs two long deck boards and two short, each matching in length.

Because I was aiming for 8.5-inch square shelves, I cut these initial pieces to 9.5 inches long. This extra length will allow you to square the shelves by cutting off the excess. 2.

When it was time to build the DIY pantry shelves, Burkhalter admits, “I thought, it’s just a tower with three square shelves—it can’t be that difficult. But I ended up having to build it ...