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How to Build a Window Box Planter in 5 Steps

Written by Jamie and Morgan

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diy window box planter tutorial

Spring is in the air and summer is right around the corner. Which means it’s flower planting time!

Jamie was just making fun of me the other day because I was SO excited about the warm weather and eating dinner outside he goes, “What is it with you girls and patios?” I laughed so hard. But seriously it made me think about why I LOVE them so much. I don’t understand what’s to not love about patios?!

Who doesn’t love a good patio?!

diy window box planter tutorial

Beautiful weather, smiling faces, the sun, ambience…smell of fresh flowers…beautiful planters…

But seriously- once Minnesota hits 70 degrees, you can find me picking out my favorite flowers to start decorating our spaces outside- ya betchya- to enjoy that patio! And there is nothing more that I love to plant than window boxes.

Window boxes are a design you rarely see sketched up within a new design plan. Homeowners typically request them. You have to have a specific taste to appreciate a good window box. But they can add so much to the overall look of your home. They provide a unique perspective to your home, adding colors and textures and something you can change with the seasons. Don’t ever leave your window boxes empty.

diy window box planter tutorial

And just because they’re called window boxes, doesn’t mean you have to only put them under you windows. Window boxes look great along banisters, railings, and any other flat and boring surface you want to spruce up! They even look great just sitting along your sidewalk or edges of your deck.

So today- we are so excited to share with you a full tutorial on how you can build your very own window boxes for as little as $20!

Build a window box planter in 5 easy steps! Add curb appeal and improve your home exterior with a beautiful window box and some greenery and flowers. Step by step from construction2style on Remodelaholic.com

How to Build a Window Box Planter
by Jamie and Morgan from construction2style

This post contains affiliate links. See our full disclosure policy here.

Materials

  • 1×10 and 1×3 cedar
  • 5 lag bolts
  • Caulk
  • 1 quart exterior grade white paint
  • 1 quart primer
  • Paint roller, pan
  • Wood glue
  • Hammer
  • Wood filler
  • Tape measure
  • Electric drill
  • Drill bits
  • Sand paper
  • Level

1. Design

The first step to any good build is a design plan. And I’m not talking about a full design layout here, just know exactly what style you want. Do you want just a simple four sided flat box, or curves, bevelled edges and molding? There are so many well designed window boxes out there it’s hard to choose which one to go with! You can make simple boxed window boxes for as little as $20 or you can go big with high quality material and high design for as much as $300. And if you hire it out you’re looking at $500+.

diy window box planter tutorial

If you are using a window box liner it’s simple to build around the liner. Or if you’re like us and want to create your very own waterproofing liner within, your options are endless. We always like to keep it classic, creating a simple rectangular box and trim work with decorative supports below.

Depending on where you’re going to place your flower boxes will also depend on your design plan. If it’s under a window, measure the width of the window and cut to your specific window dimensions. We made our window boxes very large! A good dimension for the depth and height is 11″ deep and 8 ” high.

 

2. Measure & Cut

Once you’ve decided on your design plan the next step is to get to work- measure and cut! Measure the width of the window and cut to your specific window dimensions. We made our window boxes very large! A good dimension for the depth and height is 11″ deep and 8 ” high.

How to make the perfect window boxes with Remodelaholic

Just remember that once full of plants and soil a window box can be extremely heavy, so you need to make sure you have support to drill into so it doesn’t tear your siding off. Within these window boxes that we made, they held 160 pounds of dirt into each planter. So for that amount of weight we secured them with 5 large lag bolts. We also made wooden brackets to support the weight of the boxes.

3. Assemble

When securing and assembling your window boxes, make sure you place them on a flat surface. Then clamp the front and back boards onto the table and against the bottom window box board to hold securely into place while you drill the front and the back boards onto the bottom board. Repeat for the side boards.

diy window box planter tutorial

Adding trim provides a clean and finished look to your window boxes. To add trim, cut four pieces the length and height of your box for each side of your window box. Secure into place with a nail gun or nails. Either before your woodwork or after your woodwork is assembled make sure to sand you work of art down to give it a nice soft finished look.

Once assembled, make sure you drill holes within the bottom of the planters to create drainage. This is as simple as drilling holes straight through the bottom of the window boxes, roughly around every 6 inches.

4. Prime and Paint

Before you get to the fun make sure to fill in any nails holes with some wood filler, let dry, and sand. Once sanded down it’s time for the fun- watching your project all come together. Using a brush, apply the paint primer to the window boxes. I typically like to use a 2″ brush, but any paint brush will do. As soon as the primer is dry add you fun window box color! And by fun- we mean white. Just kidding. Add any fun color you want. But we like to stay white because we like to add the fun within the flowers we plant. That way when it’s spring, fall or winter I can add just about any color I want without it clashing. Simple neutral colors are sometimes the way to go when you like to spruce it up with the decor!

diy window box planter tutorial

5. Hang & Plant

If you aren’t placing such large window boxes like we did, you can place with screws and nails and secure with a 2×4 block behind the window box and below the window for support. But being these were so large we wanted to make sure they weren’t going anywhere so we secured with 5 large lag bolts. Jamie even hung from them to make sure they were going to sell with the home!

diy window box planter tutorial

Once your pots are hung and you’re ready to plant it helps to add an inch or so of gravel prior to adding in the dirt to allow for excess water to drain. You can then cover gravel with potting soil and add the beautiful flowers and water!

And let me fill you in on a little secret…these flowers are fake! Aren’t they gorgeous?! Sometimes when you can’t manage the upkeep you can just settle for some beautiful fake flowers. You’ll have everyone fooled. Saves money year after year, creates a beautiful outdoor space, and you can have decorative flowers throughout the season…even the summertime! Because who wants to be gardening when they can be out on the lake?! Well, maybe me and especially my mom… haha!

diy window box planter tutorial

diy window box planter tutorial


More ways to add curb appeal:

Add window shutters for under $40 a pair
diy wood shutters tutorial

paint your front door
Front Door Paint Colors @Remodelaholic

more curb appeal ideas
Curb Appeal Tips featured on remodelaholic.com

more exterior window treatments
25-inspiring-exterior-window-treatments-and-diy-tutorials

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Remodelaholic is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Please see our full disclosure here.

Published: July 30, 2016Filed Under: Build, Contributor, DIY, How To Tagged: Exteriors, landscape, planter, planters, window box, Windows

About Jamie and Morgan

Hey friends! Or soon to be friends! hehe. From the bottom of our hearts it is SO nice to meet you. We are Jamie and Morgan, a husband and wife home ​remodeling​, styling, and blogging team out of MN. We blog over at construction2style all about residential ​​remodeling, ​interior styling, ​carpentry, custom-built furniture designs...and our family (and probably a lot more TMI). hehe. We just want to help create a place for you to build your legacy within; your home. So we share as much as we can within very detail of our projects and within our own home.

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Comments

  1. Susan says

    April 10, 2017 at 12:34 pm

    I’m thinking of tackling the DIY project of window boxes and will be going by your tutorial. You do mention that you like to come up with your own liner for these boxes…. what did you mean? I am just not sure what to line them with. It may not be a problem in the end because I may do what you suggested and invest in a lot of artificial flowers – yours were gorgeous. Thanks!

    Reply
  2. faye says

    April 29, 2017 at 5:22 am

    I love the boxes but how to you make the mounts to hold them up?am looking forward to doing this thanks

    Reply
  3. Robin says

    January 20, 2018 at 9:16 am

    Are you boxes square or are the tapered? It looks like the bottom is more narrow than the top from the front. And that the side, although I only see angled photos, looks like it’s square except for the front, that looks to be further out on the top than the bottom.

    Reply
  4. Jennifer says

    February 25, 2018 at 12:12 pm

    Looks gorgeous! Where did you purchase the fake flowers?

    Reply
  5. R snyder says

    April 18, 2018 at 10:57 pm

    It’s been my experience a can of insulation foam will fill a lot of area inside the boxes to reduce weight.

    Reply

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We love hearing from fellow Remodelaholics, so let us know what you like about this and leave any questions below in the comments. If you have followed a tutorial or been inspired by something you have seen here, we would love to see pictures! Submit pictures here or by messaging us over on Facebook.

Hey there, I am Cassity! Nice to virtually meet you!

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