How To Build A Window Box

June 16, 2018

This post may include affiliate links, which means that if you end up buying something, I will earn a commission at no extra cost to you.

When I was first looking around for window boxes to purchase, I was totally shocked by how expensive they were.  Many of them were $70!  For ONE window box!  I wanted at least two, ideally four, so that would have been between $300-400.  Definitly NOT part of our budget.  So it was a pretty easy decision to build them myself, especially since I take all opportunities to DIY. 😉

Supplies I Used:
6×1 Cedar Board (whatever length you need)
Drill and Drill Bits
Wood screws
Sandpaper (or a sander)
Whatever stain or paint you want (I used black spray paint)

I was making two window boxes, and I wanted both to be 32 inches wide.  So for each window box, I needed three 32 inch pieces.  These will be the bottom of the box, the front, and the back.  I had the Home Depot employee cut these pieces in the store, then I finished cutting the rest at home with my jigsaw–which is the beeeest tool ever.  This jigsaw is a great deal.  

With the three long pieces, I just held them together and used my drill to drill three pilot holes in the front. I could have used wood glue, but using screws was plenty strong enough. Then, I used my wood screws to drill in the holes along the front, like this.

Build a DIY window box

So then I had an L-shape, and I did the same thing to the other side.

Build a window box Build a window box

The first box took about 10 minutes, because I was being extra careful and cautious.  The second one took about five minutes because I realized how ridiculously easy this was.  I did it during one of my son’s rare and precious naps, but he woke up right at the end.  It was okay, because then he became my Dewalt model 😉

Awww.  Cutest picture of a drill EVER, right?! 😉

And no, he didn’t get into the drill bits.  I know they’re laying right there and you’re all worried about it.  But fear not, no babies were harmed in the making of these boxes.

Anyway, once I had the three sides for my boxes, I had to measure and cut my scrap pieces of wood for the sides.  I forgot to take pictures of this part, so you’ll just have to believe me.

If you don’t have any kind of saw, you can have them cut in the store. You just need to make sure your measurements are correct. These side pieces should be the exact width of your bottom board… since this is a 6×1 board, it should be 6 inches, but apparently many times these kind of boards are actually only about 5.5 inches.

Anyway, you could just measure your board in the store and have them cut two pieces that width, and you should be good.

Once you have those cut and screwed in, your boxes look like this!  So beautiful!

So then all I did was sand them down and spray paint them!  I don’t have a sander yet (so depressing), but it only took a few minutes with sandpaper.  (This pack of is awesome.)  And I counted it as my daily monthly workout.

This whole project from start to finish would take an hour or two.  But if you’re a mom like me, it’s totally doable while your kid is watching 20 minutes of Paw Patrol and at bedtimes. My first coat of paint went on one night at 9:30pm because I remembered it at 9:28 and thought “I’ll do it before it gets dark!”  Spoiler alert.  It was already dark.

So, I just did a light coat and it looked like this.

DIY window box

After the second coat, they looked way better.  I did paint the inside, but you definitely don’t have to.  The last thing you have to do is use a large drill bit and drill holes in the bottom of your box for drainage.  Of course, I forgot to take an after picture of the window boxes because we were too busy getting them installed and I was WAY too excited about that… So you’ll just have to settle for a picture of them installed on my house! YAY!

Build a window box

Do you hear that?  It’s the sound of angels singing, because these guys actually made it all the way from my brain to my house.

Also, here’s my instructions for how to attach your window box to siding. It’s one of my most popular posts ever, so this is obviously not common sense information like I once thought. ?

The crazier thing is that ALL my front exterior project ideas are almost done… I never thought I would see the day!  The shutters AND the window boxes are on, my lattice/wreath piece is in progress, and we just got the supplies to paint the front door today!  Ahhh!  I can’t wait to work on it all and show you all the full before and after of our front 🙂

UDPATE: Check out my full exterior makeover hereI would have loved to do MUCH bigger, crazier projects, but we ended up only being in this house for about 2 years! We still made a huge profit on it, which you can learn more about in this post.

DIY window box


Related posts:


Hi! I’m Kaylee–a mom of 2, business owner, DIY addict, and so much more. You’ll find some fun DIY tutorials, totally honest reviews, and lots of tips for making your home fit YOU. Welcome to Mama and More!