Close Window
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What you need:
  • Cedar board (approx 1" x 10" x 8')
  • Saw
  • Pencil
  • Straight edge
  • Wood glue
  • Clamps
  • Drill and 1/8" bit
  • 1 1/4" exterior wood screws
  • Damp rag

With just a few simple tools and supplies, and 1/2 hour of free time, you can build this simple window box.
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First, measure the five pieces of the window box on a section of cedar board. Here, we used a 1" x 10" x 8' board, and measured a 9" by 24" piece (the back), an 8" by 24" piece (the front), a 7" by 24" piece (the bottom) and two 7" by 7" pieces (the sides). Adjust the dimensions to fit your needs.
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Cut the lumber to size. On the section that is to be the bottom of the box, drill a series of " drainage holes.
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Arrange the lumber on your workbench with the edges to be attached facing up. Apply wood glue to all the edges that will be connected.
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Clamp the walls and the bottom together, with the sidewalls inset between the front, back, and bottom pieces. Drill 1/8" pilot holes into the walls. This will keep the wood from splitting when you screw them together.
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Fasten the walls together with 1-" exterior wood screws. Avoid galvanized screws as they react badly with cedar.
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Once the screws are in place, remove the clamps. Use a moist rag to wipe off excess glue that squeezed out when the walls were screwed together and you are done! Mount your window box with bolts or hardware available at your local nursery or home center.