How to Build a Window Box Planter

• Measure the dimensions of the window for width, height and distance from the top of window to the ground

• For the project shown, we made the inside top of the structure 7 feet tall and and 5 feet wide.

• Make two lattice panels as shown, measuring 12 x 84 inches. 
• Use the 2- x 2-inch x 8-foot boards as the frame, using 2-inch screws to attach. 
• Use the 1- x 2-inch x 8-foot boards for the inside lattice, using 1 ¼-inch screws to attach the centers.

• Cut two 2- x 4-inch x 8-foot boards to 78-inch lengths.
• Mark 9 inches in from each end and cut with a jigsaw.

TIP: Draw your template on a piece of cardboard and cut with scissors when satisfied with shape. 

Use as a template to mark all the ends needed.

• Cut seven 21-inch lengths from the 2- x 6-inch x 8-foot boards.
• Mark 9 inches in from only one end of each length and cut with a jigsaw.
• Notch each piece 3 ½ inches deep, from 0 to 1 ½ inches and from 10 ½ to 12 inches, to make room for the 2-inch x 4-foot boards.

• Assemble the boards from steps 4 and 5 in an interlocking grid with all short pieces facing the same direction. 
• Secure the structure using glue and large screws as needed.

• Lay the side panels flat on ground to attach to the top structure; make sure it fits squarely inside.

• Use two 5-foot long pieces of 1- x 12-inch x 8-foot board for the front and back of the box.
• Make the sides with the desired angle to attach the front. 
• Use a piece of 1- x 8-inch x 8-foot board for the bottom of the box. 
• Use wood glue and screws for a solid bond. 
• Drill drainage holes in the bottom of the window box. 
• Attach to the frame so the box is below the height of the windowsill.

• Paint with exterior paint or stain as desired.

• Attach the entire structure to the wall, securing with 3-inch screws.

• Put a layer of rocks at the bottom of the window box to stop the drainage holes from getting clogged.
• Add potting soil and flowers.