How to Make Window Planter Boxes


A window planter box is the perfect way to spruce up the walls outside your house. It is cheap, visually pleasing and aromatic as well, depending on the types of flowers you plant. You can spend several relaxing hours either indoors or outside, watching birds, butterflies and bees flutter around the contained flowers. Although planter boxes are easily available in stores and are made to order as well, making them yourself will not only cut excess costs, but you can also customize them to fit your windows.

How to Make Window Planter Boxes

Step 1

Measure the dimensions of your window to determine the planter size accordingly. It should be as long as the window, and as wide as the window and the frame. A depth of 7 to 9 inches provides suitable space for the roots to spread and grow. However, you can alter the measurements to fit your requirements.

Step 2

Purchase 1-inch thick good quality pressure treated lumber from a local hardware store. You can choose between softwoods or hardwoods according to your preference and the allocated budget. Cut five boards for your window planter box with a handsaw or ask a professional at the store to cut them for you. You need two long panels for the front of the planter and the back, two for the short sides, and a base panel similar in length to the front and equal in width to the sides.

Step 3

Place the base piece over a flat and even surface. Hold the back piece flush against its lower long edge. Make sure the tops are in line with one another, and join both the pieces by drilling three to four 1-inch galvanized woodscrews in the lower edge.

Step 4

Place a side piece flush against the base, aligning it so the joints between the short piece and base and between the short piece and back are flush and even. Secure it in place by drilling woodscrews into the base piece so it is held tightly in place. Also drill holes into the back that penetrate the side piece to hold it together. Attach the other short side to the structure the same way.

Step 5

Lower the front piece of the planter box in place, adjusting it so the joints are even and flush with one another, and the tops are at the same level. Secure it in place with woodscrews. Check the stability of the box by reviewing all the joints, and strengthen any weak joint with woodscrew to make it secure.

Step 6

Turn the planter box so its base faces you, and drill ¾ to 1-inch drainage holes into it, spaced 8 inches apart. Rub sandpaper over the holes and edges to make them smooth.

Things You'll Need

  • Measuring tape
  • Notepad
  • Pencil
  • Wood boards, 1-inch thick
  • Handsaw
  • Drilling machine
  • 1-inch woodscrews
  • Sandpaper


  • Outdoor Planters
  • How to Make a Wooden Planter
  • Window Boxes

Who Can Help

  • Window Boxes
Keywords: planter boxes, window planters, diy window planter boxes

About this Author

Tanya Khan is a freelance author and consultant, having written hundreds of thousands of words for various online and print sources. She has an MBA in Marketing but her passion lies in giving her words wings.