DIY Window Grids (Mullions)

5 Materials
3 Hours

UPDATED: I figured an easy way to make them removable. For more details, please visit
This project is the result of a little OCD and a lot of "there still is something missing in the dining room." Luckily, the latter and the former came into perfect harmony yesterday when I had my ah ha moment. I realized that I wanted to do
diy window grids mullions, diy, home decor, windows
The dining room windows before.
diy window grids mullions, diy, home decor, windows
First things first: I had to find the right materials. I opted to purchase screen trim from Home Depot (cost around $3 for 8 feet). It was the perfect depth and easy to work with. And did I mention the price?
diy window grids mullions, diy, home decor, windows
Next, I had to decide how wide apart I wanted the vertical pieces. I decided on two vertical pieces that were spaced about 10 1/4 inches apart. Next I decided how many horizontal pieces I wanted. For that, I opted for three rows. Having figured that out, I measured the length from the top of the window to the bottom (just the glass part). I made those cuts and attached them to the window with double sided tape. This allowed me to accurately measure the length of the horizontal pieces. After figuring that out, I went and cut 48 (yes 48!) horizontal pieces and the remaining vertical pieces.
diy window grids mullions, diy, home decor, windows
Attach the grids. This is where it comes down to personal preference. Keep in mind that no one will see these close up at my house. With that in mind, I opted for hot glue. May sound like an odd choice, but I've used it on glass before and it creates an amazingly strong bond. As long as you use it on a low setting, it will be fine. Keep in mind, though, that it will leave a little dot on the window. You would have to get really, really close up to see the dot, but there is a dot there none the less. The other option is to use a really good double-sided tape. I actually used double-sided tape when I was laying it all out and it was very hard to see outside. The reason I didn't stick with this is because I knew the cat would be able to pull them off rather easily.
diy window grids mullions, diy, home decor, windows
Voila! From start to finish, it took a full day. The longest part of all of that was waiting for the paint to dry. The rest of it (measuring, cutting, gluing) took about 3 hours.
diy window grids mullions, diy, home decor, windows
diy window grids mullions, diy, home decor, windows
diy window grids mullions, diy, home decor, windows
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The Rozy Home

Want more details about this and other DIY projects? Check out my blog post!


Have a question about this project?

3 of 27 questions
  • Terri valdes
    on Jan 13, 2019

    Can you open the windows?

  • Suz Roberts
    on Jan 14, 2019

    Looks awesome! ....does it look the same from the outside? I would like to try it with a patio/sliding glass door. I want it to look like the cottage style windows that are expensive at home improvement stores.

  • David J Hanson
    on Jan 20, 2019

    Ok so it looks good from the inside but when looking at it from the outside wouldn’t you see the glue? Or does it soak into the foam?

    I like this idea and would try it out but I’d like to see the outside view.

Join the conversation

3 of 167 comments
  • Billie Pembor-Zastresek
    on Jan 20, 2019

    And a pain for cleaning windows I had some like that

  • Allison Newby
    on Jan 23, 2019

    I think it looks amazing! Well done! I love those ahha moments!!! They are gold to me! I thought of doing something similar a year ago but only to the front large old icky window to give it a cleaner nicer appearance from passing onlookers but it prob would have led to more problems since I wanted to do it on the outside of the window....but I'm thinking of another route to take. Thanks for the inspiration! 😊

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