Learn how to build your own wood window cornice box to dress up your window frame. Building a custom wood window valance is a great beginner building project!
Plan the look of your cornice. And, Measure your window from the outside edge of the window casing on one side to the outside edge of the window casing on the opposite side.
I cut all the pieces for my cornice first. I cut my 1″ x 8″ common board to length and cut both of the short sides at a beveled 45-degree angle using a miter saw.