How to Build a Window Box
Window boxes add charm and a splash of color to a home's exterior, and they can really boost your curb appeal. This simple woodworking project is ideal for a novice DIYer and can be completed in a day.
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When measuring dimensions of side panels, allow an extra 1 1/2-inch overhang on back side to cover up exposed cleat on house. Attach sides to planter using 1 1/4-inch wood screws.
Cut two 1 1/4-inch-wide trim pieces to exact length of front panel of window box. Make sure that each trim piece is flush with top and bottom of front panel, then tap into place with nails. Position three 1 1/4" wide x 5 2/4" long pieces on left and right side of box and one centered. Tack into place with nails.
Prime and Paint
Using a sash brush, apply primer to window box. If using a dark color like red or black, start with a tinted primer coat for better coverage. Allow primer to dry, then apply one to two coats of exterior semi-gloss paint. Tip: For a smooth finish on the window box, fill nail and screw holes with wood filler before painting. Allow to dry, then sand entire box with medium-grit sandpaper. As this is an exterior project, this finishing step is optional.