One of my favorite things about spring and summer has to be the flowers! Wouldn’t you agree? I just love opening the blinds, looking out of the window & seeing some beautiful flowers in my yard or pouring out of a window box or container. In the back of our house, I have two windows (that happen to belong to the master bedroom) that were just asking for some window box planters.
Today, I’d love to share how easy it was to make my own custom cedar window box planters for around $30 each. Remember safety always comes first. Please use eye protection, ear plugs & follow all safety precautions when using power tools. They can be dangerous!
If you follow this tutorial you will enough wood & supplies to make two 36 inch window boxes. So please adjust the measurements as needed to fit your windows. Let’s get started!
Things you’ll need for this project:
- 1×12 cedar board
- 1×8 cedar board
- table saw
- miter saw
- wood screws
- 1 inch nails
- wood glue
- wood stain (optional)
Step One: Trim your wood.
I chose cedar wood for this project because it holds up well outside & is resistant to decay. You could also use treated wood if desired. First, you will trim (3) long ½ inch strips off your long 1×12 cedar board. Set them aside to use later on for the trim. Then trim your long board down to match the width of the 1×8 board.
Step Two: Cut the pieces of your window box.
Next cut (6) 36 inch boards & (4) 6 inch boards using the 1×8 & the trimmed down 1×12. Assemble your boxes as shown & clamp each box into place using (3) 36 inch pieces & two shorter 6 inch end pieces. Remember you will be able to make 2 boxes from the wood we cut just cut. Also, on this step you will need to decide if you want the rough side of the board or the smooth side of the board on the outside of your window box. Since I wasn’t planning on staining mine, I decided to have the rough side of the wood out. I love the texture it gives the window boxes.
Step Three: Screw your pieces together.
Next, you will screw your boxes together using wood screws. Always predrill your holes before screwing in the screws. This will help prevent the wood from splitting. Use two screws, one at the top & one on the bottom, on each side & on both ends of each of your window boxes.
Flip your window box over, clamp on the bottom piece & then you’ll be able to screw the bottom piece into place. You’ll screw in two screws on each end & two screws along each side of each window box.
Step Four: Drill drainage hole.
You’ll want your window boxes to have good drainage for watering & when it rains. You’ll want to drill four drainage holes along the bottom of each window box using a ½ inch drill bit.
Step Five: Cut & add the trim pieces.
Do you remember the ½ inch trim pieces we set aside in step one? Well, now it’s time to get those out. For each window box, you will need (4) 34 ½ inch pieces & (2) shorter 8-inch pieces. Using wood glue & 1-inch nails nail them in place with a hammer. To make the x we nailed down one strip going diagonal across the box. Then we used a pencil to mark where to cut the other trim piece where it overlapped. Then we cut that piece with a saw, & then nailed & glued it into place.
The only thing left to do was to hang these window boxes under our favorite windows. To hang ours we used coated wire threaded through the weep holes of our window frames. Then we screwed some wood screws on the back of our boxes & then attached the wire that way. You could also use shelf brackets, screws or wooden braces depending on what your house is made out of & what is recommended.
Then it was time to plant some beautiful flowers. Let me know if you try this project. I’d love to hear how it goes. Let me know if you have any questions!
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