Wooden window boxes add charm to a home and increase the visual curb appeal. A simple wooden window box is low cost to assemble and painted in a color that coordinates with the home. You can alter the size of a standard window box to various sizes and shapes for use in the home or on a patio or porch. Purchase plastic liners from garden supply stores to prevent water damage to the box and increase the ease in planting.
Measure the exterior window length and calculate the desired finished length of the window box. Common window box sizes are 30 or 36 inches long.
Cut a front and back piece 36 by 6 inches. Cut the bottom pieces 36 by 8 inches and two side pieces 6 by 6 inches. Adjust the 36-inch length to the calculated length in Step 1 if needed.
Add drainage holes to the bottom piece by drilling a 1-inch hole into the center or a 3/4-inch hole on each side two inches from the short edge. Sand the wood pieces with fine grit sandpaper to smooth rough areas and edges.
Predrill 1/16-inch screw holes in each corner of the back, front and bottom pieces.
Glue the back and front pieces to the side pieces with waterproof wood glue. Screw the pieces together with 1 1/3-inch screws using the predrilled holes.
Glue the bottom piece to the top of the wooden window box with waterproof wood glue. Secure the bottom piece by screwing 1 1/3-inch screw through the predrilled holes.
Drill a 1/2-inch hole into each top back corner 1 1/2 inches from the top of the wooden window box. Hold the window box to the desired mounting location and mark the hole location on the house.
Install a hanger bolt at each marked location on the house by drilling a 1/2-inch hole and screwing the bolt in place so 2 inches stick out. Place the window box onto the protruding bolts through the holes on the backside. Secure the box with a washer and nut.