How to Insulate Drafty Windows (Permanently)!

3 Materials
1 Hour

If you have tried weather stripping and all of the other quick fixes to cut back on the cold air getting through and around your windows, maybe what you need is to insulate the window. Many homes built after 1980 do not have insulation around the windows (and some older homes as well). Why? Well, we now have a lot of spec homes out there (those multiple construction homes that were built with no one particular in mind). And many of us own one of these. But even other types of homes can have this problem. My own home was a custom built, designed by yours truly. :-) And I still had this problem in one of my bedrooms. (you have to watch some subcontractors with a hawk's eye).
All finished and snug as a bug!
At any rate, this room was having trouble getting warm. A lot of drafty air was coming in around this window. But, these were high end windows and brand new. No problems with the weather stripping or anything. So, I had a sneaky suspicion that the insulation crew failed to properly insulate this window.
I checked beneath the window trim and sure enough, no insulation around this window.
After removing the bottom trim, I could actually feel the draft even more. I saw 1 tiny pin prick hole of light shining through. So, I am sure that it was the biggest culprit. But now, problem solved.
The last step is to replace everything. It took me just about 1 hour total to complete, but was relatively easy. You can check out the entire step by step, on my blog to get a breakdown of all the steps and details.

Suggested materials:

  • Hammer
  • Utility knife
  • Pry bar

Top Hometalk Projects

16 Creative Ways To Upcycle Pallets
29 Of The Best DIY Mirror Projects Ever Made
17 Faux Brick Ideas For Your Home
15 Kitchen Updates Under $20
14 Cool Ways To Upholster Chairs That You Can DIY
16 Ways to Showcase Your Herb Garden
11 Unexpected Ways to Use Spices in Your Home
16 Creative Ways To Upcycle Pallets
30 Fun Way To Brighten Up Your Backyard This Summer
17 DIY-Inspiring Kitchen Backsplashes
15 Genius Curtain Ideas To Instantly Upgrade Your Space
30 Unusual & Helpful Gardening Tips You'll Want To Know
31 Coastal Decor Ideas Perfect For Your Home
15 Fabulous Fire Pits For Your Backyard
30 Unusual & Helpful Gardening Tips You'll Want To Know
Rachel Lynn |

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


Have a question about this project?

3 of 6 questions
  • Pam
    on Jan 16, 2016

    Looks fairly easy, but what if you do not have any trim around the windows? Do you have a fix for those kind?

    • Pam
      on Jan 16, 2016

      @Rachel Lynn Fantastic. Thank you so much. This will help with our issue I'm sure. Appreciate the advice.

  • Marion
    on Jan 16, 2016

    My windows aren't trimmed out. How do I fix them?

  • Miss E
    on Jan 18, 2018

    I know this is about windows. But I'm a damsel in distress. There is plenty of light and cold air coming through my front and back doors. As a First time home owner that's new to this but really trying what do I do?

Join the conversation

4 of 28 comments
  • Drd4223999
    on Mar 26, 2016

    Thanks! I'm buying an older home and I'm pretty sure they didn't insulate (1940-50s). Am concerned about damaging the trim when removing it though. Maybe I can try on a less visible window to see how it goes.

  • Jason
    on Mar 26, 2016

    A word of caution...spray foam can void warranties of windows

Your comment...