Your materials will vary based on the size of your window or door. There are a few key measurements to keep in mind as you customize this design to fit:
- Make the inside of the box 1/8 in. longer than the door or window trim. That way, the box will easily fit over the trim.
- The height of the box should be about the same as the width of the window or door trim (or you risk having the door hit the shelf when it opens). If this is doubling as a valance, the box can hang below the trim.
- The top shelf should overhang the three edges (the front and the two sides) of the box equally so the crown molding fits symmetrically.
Crown molding comes in a variety of styles and widths (from 2-1/4 in. to 6 in. and larger.) Mock up a small section of shelf to determine the best size and proportion of molding for your project.
Mount the completed shelf to the wall above the window or door. In most cases you'll be able to secure the shelf to the trim and framing along the sides and top of the opening. If not, use L-brackets mounted to the top of the shelf. Note: Use extra care if you mount this over an entry door (or one that your teenager slams a lot). Be sure all the displayed items are arranged securely behind the “lip” created by the cove molding.