YellaWood® Outdoor Building Project Plans

Build a Window Planter Box

Estimated Cost: $$$$

1

Total: 3 hours or less

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Add some color to your home's exterior and brighten your view from inside the house with this simple, classic window box design. Built to accommodate most common flower and plant containers, you can build several boxes in one day using this simple design – and dress up as many windows as you wish.

Here we use a simple pair of interlocking beveled cleats to attach the box directly to the house. But you can use rugged metal brackets or adjust the plan to accommodate nearly any hanging apparatus you like best. You can also play around with the front piece and cut a more decorative profile to suit your home's architectural theme.

Before you get started, please read our info on safety, fasteners and building tips.

Before building, please consult our Terms of Use.


Download Plans


  • (1) 1 x 8 x 10' YellaWood® brand pressure treated pine
  • (1) 1 x 6 x 8' YellaWood® brand pressure treated pine
  • 1 ½" galvanized finish nails
  • 1 ¼" deck screws
  • Waterproof wood glue
  • 2" finish nails
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  • A. (1) ¾ x 7 ¼ x 33"
  • B. (1) ¾ x 7 ¼ x 31"
  • C. (2) ¾ x 7 ¼ x 10 ¼"
  • D. (1) ¾ x 1 ½ x 34"
  • E. (1) ¾ x 1 ½ x 30 ½"
  • F. (2) ¾ x 1 ½ x 10"
  • G. (3) ¾ x 1 ½ x 8 11/16"
  • H. (1) ¾ x 1 ½ x 31"
  • I. (2) ¾ x 1 ½ x 31"
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Miter saw or circular saw
Miter saw or circular saw
Table saw
Table saw
Driver
Driver
Drill bit
Drill bit
Finish nailer or hammer
Finish nailer or hammer
Damp rag to wipe up excess glue
Damp rag to wipe up excess glue
Nail set
Nail set
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Assembly Video

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Instructions

arrow arrow arrowSteps 1-3

  1. 1

    Cut all the pieces according to the dimensions on the cut list. For the trim (D, E, F), support pieces (G) and blocking (H), rip three 1 ½" pieces from the 1 x 6 on your table saw.

  2. 2

    For the cleats (I & J) , which will be used to hang the box on your house, set your table saw’s blade at 45° and rip the remaining 1 x 6 stock down the middle. Reset your saw blade to 90° and rip both pieces to 1 ½" wide.

  3. 3

    Attach one cleat (I) and blocking (H) to the back panel (B), as shown in the illustration. Use glue and screws.

arrow arrow arrowSteps 4-6

  1. 4

    Attach the side panels (C) to the back panel (B) with finish nails and glue, keeping the ends flush with the cleat and blocking.
    TIP
    If using a hammer and finish nails to attach pieces, you will have to drill pilot holes so as not to split the wood. Set all nails below the surface with a nail set. These steps are unnecessary when using a finish nailer.

  2. 5

    Attach the front panel (A) to the side panels, keeping a ¼" overhang on each side.

  3. 6

    Lay out and mark the locations for the bottom supports (G) on the inside bottom of the back and front panels. Center one support and keep the two end pieces 2–3" in from the ends. Attach with glue and finish nails.

arrow arrow arrowSteps 7-10

  1. 7

    Set the back trim (E) and side trim (F) pieces in place, keeping the back trim and ends of the side trim flush with the back of the hanging cleat, and the side trim overhanging evenly (approx. ½") on both sides. Attach with glue and finish nails.

  2. 8

    Attach the front trim (D) with glue and nails. You should have an approximate ½" overhang on the front and ½" overhang on either end.

  3. 9

    Break all edges and touch up rough spots with sandpaper. Make sure all nail heads are set below the wood surface.

  4. 10

    Apply a waterproofing finish to all exposed surfaces according to manufacturer instructions.

arrow arrow arrowSteps 11-12

  1. 11

    Attach the second cleat to your home using appropriate anchors/screws for your siding material. Be sure to keep the cleat level and spaced properly below your window trim.

  2. 12

    Attach the box to your house using the interlocking cleats. If you want to hang it permanently, drive additional screws through the inside of the back panel, the cleats and blocking and into your home’s siding.