• taryngibb

How to Build a Cedar Window Box

We have a massive window at the front of our house. it's about 8 feet wide, and we have a garden just below it. Our front yard needed some work, so this was our first step to updating the front of the house. We have a few trees to clear still, but I'm in love with our winter planter.

I wanted to share with you the steps so you could make one yourself!

What you’ll need to make an 8 foot planter:

Lumber & Accessories:

6 – 1x6x8 Cedar Fence Boards

3 – 2x2x8’ Pressure Treated

6 – 1x3x8’ Cedar Boards

350 Cedar Deck Screws

Wood Glue

I've created a cut list that you can use as a quick reference guide! You can download it HERE


Miter Saw



Robertson Bit

1/16” - Drill Bit for Pilot Holes


Determine how long you want your window box to be. We had an 8-foot window, so this was the length I chose to make mine. If you’re looking for something smaller, take any of the 8-ft pieces and replace these with the length you need.

Create the Frame: Cut from 1x2x8 Sienna Pro Brown Pressure Treated Boards. You can use regular pressure treated lumber, but Sienna Pro, Brown Pressure Treated looks more like cedar. Here are the cuts you need:

4 - 7’10” with a 45-degree mitre as drawn

4 - 10” with a 45-degree mitre as drawn

8 - 10” length, straight cut

Create the Base: Cut from 1x3x8 Cedar Boards

4 - 7’10” long with 2 boards notched for 2x2 supports for the base. Stand up one of your 2x2 boards, trace it, and cut along the line with your jigsaw.

Add 2 supports on each frame. This will allow for a bit more stability. You'll add 2x2 pieces in each corner, these will be used to connect the two frames together. There's one more step before this though.

Lay your 'floor' pieces onto the bottom of the frame. And screw these into place.

Attach the two pieces of the frames together.

Assembling the Walls:

Lay your 12" boards out around your box to check your spacing. If you start from the centre and work your way out, you can get a symmetrical finish, and trim just the last pieces if needed.

{TIP} Drill a small pilot hole where you're going to screw in the pieces of wood. This will prevent the boards from cracking as you screw into the boards.

Once you've assembled the sides of your planter, you can finish the planter with a cap. The cap will over hang the planter slightly and and add some character.

You also have the opportunity to cover the screw holes with an additional piece of cedar This can be glued in place so the screw holes aren't visible. I'm still debating adding this, I'll decide once the whether warms up and I can add to it.

Do you think you'll try it out?

Show me what you've done in the comments below!

- Taryn

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Taryn It Up is a DIY and Lifestyle blog that is meant to inspire and empower women and men to take on projects outside of their comfort zone. Taryn Gibb offers DIY tutorials for easy DIY projects anyone can do at home. TarynItUp will show you how to renovate a kitchen, give you tips and tricks to renovate any room of your home and help you to pick the right decor to enhance any style. Complete your projects at your own risk.

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© 2017 by Taryn Gibb

Whitby, Ontario