How to Build a Window Box Planter

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Building a window box planter is easier than you think. With the right tools, it can be made in less than an hour for under $20 in supplies. It's the perfect afternoon project for any time of the year.

(Image: mavis butterfield )

Things You'll Need

  • (1) 5/8" x 6"x 8' cedar fence panel
  • (1) 1"x 2"x 6' cedar board
  • Tape measure
  • Pencil
  • Power saw
  • Wood glue
  • Hammer
  • 1 1/2" galvanized finish nails
  • (2) L brackets
  • (4) 1" galvanized screws
  • (4) 5/8" galvanized screws
  • 1" spade drill bit
  • Drill
  • Sandpaper
  • Paint or stain (optional)

Step 1: Cut Your Boards

This project is for a 30" window box. If you want to make one that's shorter or longer, simply cut two pieces of wood the same length for the front and back of the the desired box length. Cut two 5/8"x 6"x 30" pieces of wood and set aside. Next, cut two 5 1/2" x 5 1/2" end pieces.

(Image: mavis butterfield)

Step 2: Apply Wood Glue to End Pieces

Apply wood glue to the ends of the 5 1/2" x 5"1/2 end pieces.

(Image: mavis butterfield)

Step 3: Attach Sides to End Pieces With Finish Nails

Using finish nails, attach the end pieces to the front and back boards.

(Image: mavis butterfield)

Step 4: Measure the Inside of Window Box

Measure the inside of your window box to get the exact measurement you need to cut for the bottom of the window box. For a 30" window box you will need a 5/8"x 6" x 27 3/8" piece.

(Image: mavis butterfield)

Step 5: Insert Bottom of Window Box

Using a hammer, tap the bottom piece of wood into your window box.

(Image: mavis butterfield)

Step 6: Finish Nails

Pound finish nails every four inches around the bottom of the window box to secure the bottom to the side and end panels.

(Image: mavis butterfield)

Step 7: Cut Trim Pieces

Once your box is constructed, it's time to cut your trim pieces. Cut (2) 1"x 2" x 6 1/2" and (1) 1"x 2" x 30" pieces for the sides and front of your window box.

(Image: mavis butterfield)

Step 8: Apply Trim

Apply wood glue to the bottom of the trim pieces. Then, using your finish nails and hammer, attach the sides first and then the front.

(Image: mavis butterfield)

Step 9: Sand Rough Edges

Using a medium grit sandpaper, sand the window box down a bit so the edges are not rough. Paint or stain the window box (if you want), and let it sit overnight to dry.

(Image: mavis butterfield)

Step 10: Drill Drainage Holes

Using a drill and a 1" spade drill bit, drill two holes into the bottom of the planter box.

(Image: mavis butterfield)

Step 11: Mount the Window Box Using L Brackets

Attach the window planter box to your house just below the window using L brackets and 1 1/2" galvanized screws to hold your window box securely in place. Drill 5/8" screws into the bottom of your planter box to hold the L brackets into place.

(Image: mavis butterfield)

Step 12: Plant With Flowers

Plant with your favorite sun-worshiping or shade-tolerant flowers, as appropriate; then step back and marvel at the amazing window box you just created.

planted window box
planted window box (Image: mavis butterfield)
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