How to Build a PVC Window Box
PVC boards offer the look of painted wood plus protection from the elements
A window box bursting with blossoms will brighten any window, from inside or out. If you buy a stock one, you'll have your choice of designs, but you'll also be limited to standard lengths—typically 2 to 6 feet, in 6-inch increments.
Building the paneled box shown here offers you the chance to tailor your planter to the width of your window and select molding to match your home's style. PVC boards come in white but can be painted any color. Either way, they mimic the look of painted wood without being a target for rot and mold. They're available at home centers in the same dimensions as traditional lumber. If you prefer to work in wood, choose a water-resistant species, like teak or cedar.
Download and print the cut list for building a PVC windowbox.
PVC windowbox cut list
We built a 30-inch-wide window box designed to sit beneath a 32-inch-wide window. For boxes longer than 48 inches, add a third bracket at the center of the box.
1x10 PVC front and back pieces: two @ 30 inches
1x10 PVC end pieces: two @ 7¾ inches
1x10 PVC bottom piece: one @ 30 inches
1⅛-by-1 ⅛-inch PVC outside-corner molding. Cut to fit.
PVC cap molding. Cut to fit.