The first step to building slab-style cabinet doors from solid wood is to cut the boards to length. Because we'll be using tongue and groove joinery to assemble the boards, you'll want to account for the half an inch of width for each joint that will be lost when the boards are joined.
Also, it is a good idea to allow at least one extra inch of length on each board. You can cut off the extra after the assembly is complete.
For my example 13" x 13" cabinet door, I cut three sections of 1x6 to 14" in length using a circular saw or compound miter saw.


