Garden-fresh offers are one step away
Sign Up & Get $5 Off

Opt-in to mobile texts to receive money-saving, project-inspiring alerts. Redeemed in stores only.

Just For You

Weekly Gardening Tips for Your Area


Dress Up Windows: DIY Window Box

Home Depot
Print Friendly, PDF & Email
Difficulty: Advanced
Duration: Day


DIY window box

If you want to add curb appeal or if your windows just seem a bit bare, add charm by creating your own window box.

Fill it with your favorite flowers and update it with the seasons. Dress up any window and add living décor to your house today.


Measure your window for the box

Step 1: Determine size of window box. Measure the length of your window in which the flower box will sit. We are going to make a 10′ 4″ box, but you should adjust the length of the wood to fit your window.


Cut Wood

Step 2: Cut the wood. Remember, measure twice, cut once.

  • Three 1 x 12 x 10′
  • Two 1 x 12 x 12 3/4″
  • Two 2 x 2 x 9′ 9″
  • Four 2 x 2 x 9 3/4″
  • Two 2 x 2 x 11″
  • One 1 x 2 x 11′ 1/2″
  • Two 1 x 2 x 12 3/4″


Step 3 Glue Window Box DIY

Step 3: Build the base. Use one 1 x 12 x 10′ piece as your base. Lay one 2 x 2 x 9′ 9″ piece on either side of the base, even with the edge and leaving 1 1/2″ on each end. Glue the two pieces together. Clamp in three different places. While clamped, drill six pilot holes evenly spaced and secure with six screws through the 2 x 2′ into the 1 x 12′. Repeat on the other side.

Using two 2 x 2 x 11″ pieces, repeat step 3 on the short edges of the 1 x 12″ to complete the rectangle. Use two screws to secure each piece.


Drainage holes for DIY window box

Step 4: Cut drainage holes in base. Cut six holes using a 3″ hole saw drill bit for drainage. Space the holes as evenly as possible but do not drill a hole where a window box bracket will be placed underneath.


Attach sides and front

Step 5: Build sides of box. Take two 2 x 2 x 9 3/4″ and place them on a 1 x 12 x 12 3/4″ piece. Position them 7 3/4″ apart with 3/4″ on either side and flush at the top. Glue and hold with clamps.

Once glue dries, place on the right side of the base. The 2 x 2’s should be sitting on top of and lined up with the 2 x 2’s on the base. Use three screws to secure the bottom and two more screws in the sides to secure the pieces together, creating the right wall of the box. Repeat for the left side.


Build the window box

Step 6: Build the front and back. Run a 1 x 12 x 10′ piece along the front of the box. Have someone hold this in place while you screw eight screws evenly spaced along the bottom into the base. Use three more screws up each side of the front to secure to the side walls. Repeat the step for the back of the box.


Attach trim

Step 7: Attach trim. Place a 1 x 2 x 10′ 1 1/2″ piece of trim along the top front. Let it hang over 3/4″ on each side. Glue and hold with clamps. Take two 1 x 2 x 12 3/4″ pieces of trim and place on the top right and left side. Glue and hold with clamps.


Paint the window box

Step 8: Paint the window box. Apply wood putty to cover each screw head. Sand down once dry. Choose an exterior primer and paint in your favorite color, and paint box. Let paint dry. A painted box lasts longer.


Attach window box to house

Step 9: Attach window box to house. Use the appropriate size window box brackets to attach to the wall of the house. Follow directions. Once the box is in place, screw through the back of the box into house studs.


Plant your window box plants

Step 10: Plant. Lay landscape fabric along the bottom of the box. Add quality potting mix. Use flowers or edibles suited for your region and for the amount of sun the planter gets.


For each screw you should drill a pilot hole using a 7/16 drill bit.


Product Checklist:

Got questions about this article or any other garden topic? Go here now to post your gardening ideas, questions, kudos or complaints. We have gardening experts standing by to help you!