DIY Window Trim Perfect for Any Room

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Are you dreaming of adding a touch of sophistication to your home without breaking the bank? Look no further than DIY window trim! Transforming your windows with stylish trim is a simple yet effective way to elevate the aesthetic appeal of any room.

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Intimidated by the prospect of tackling a DIY window trim project? Don’t worry—we’ve got you covered! With the right supplies and a bit of guidance, you’ll be well on your way to achieving professional-looking results that will impress even the most discerning eye. 

Are you searching for a DIY project that delivers maximum impact with minimal effort? Look no further than DIY window trim! One of the best parts about this project is its simplicity—it’s the perfect introduction to home renovation for beginners and seasoned DIY enthusiasts alike. With just a few basic tools and a little bit of patience, you can achieve professional-looking results that breathe new life into your space.

Supplies to DIY Window Trim

Instructions for Creating Window Trim in Any Room

in progress image of DIY window trim
  • Measure the dimensions of your window frame. Be sure to measure all sides because your window will likely not be perfectly square and have equal side lengths.
  • It’s common to leave a small space between the inside edge of the trim and the outside edge of the window. This is called a “reveal”. I am leaving a 1/4 inch reveal all around this window.
  • Then measure the width of your trim. The trim I’m using here is 2 1/4 inches wide. I add 1/4 inch to that number to account for the reveal. So my window trim will go past my window frame 2 1/2 inches on each side.
  • I like to start by installing the top trim piece first. To determine the length of trim needed for the top piece, add the window width to the sum of the trim width and reveal width times two.
  • So for example, if my window width is 30 inches, trim width 2 1/4 inches, and reveal 1/4 inch, this is how I find my total trim piece length: 30 + 2.5 + 2.5 = trim length
  • Use the same formula for the other three trim pieces.
  • Using a miter saw or miter box and handsaw, cut the trim boards at a 45-degree angle for each corner of the window frame, measuring from the outside corners. If you want a more square look, you can skip cutting the boards at a 45-degree angle and just cut them at a 90-degree angle. 
in progress image
  • Align the top piece of trim above the window frame, leaving a 1/4 inch reveal, ensuring the trim extends past the window equally on each side.
  • Secure the trim in place using a brad nailer or hammer and finishing nails, ensuring a snug fit against the window frame. Nail into studs when possible. Use a level to help keep your trim piece straight.
  • Attach the other three trim pieces in the same manner, again checking to make sure they are plumb and level.
  • Fill all nail holes and the corner seams with wood filler.
  • Use sandpaper to smooth any rough edges and ensure a seamless finish.
  • Apply caulk along the edges of the trim to fill any gaps and create a polished look.
  • Allow the caulk to dry completely before painting or staining the trim to match your decor.

Another Window Trim Style

As you can see in this bottom photo, the trim style is different from the above images but the install process is similar. The window sill was existing, and I used a craftsman style trim to match the door trim in this room. There is still a 1/4 inch reveal, but the trim pieces meet at 90-degree angles, and the top trim piece is wider and thicker than the sides.

final image of completed project

Tips and Tricks

  • Measure twice, cut once! Double-check your measurements before making any cuts to ensure accuracy.
  • Invest in quality trim boards to achieve a professional-looking finish that stands the test of time.
  • Take your time during installation to ensure that each piece of trim is aligned properly and securely attached.
  • Use a level to ensure that your trim is straight and evenly aligned with the window frame.
  • Experiment with different trim styles and finishes to find the perfect look for your home.

How do I determine the correct size and style of trim for my windows?

Start by assessing the proportions of your windows and the surrounding space to determine the appropriate width and thickness of the trim. Consider the overall aesthetic you want to achieve—traditional, modern, rustic, etc.—and select a trim style that complements your interior decor. Take inspiration from home improvement magazines, online resources, or even neighboring homes to identify trim styles that resonate with your vision. Remember, the goal is to enhance the beauty of your windows while harmonizing with the existing design elements of your home. Once you have a clear idea of the size and style you prefer, you can confidently proceed with selecting and installing the perfect window trim.

Can I paint or stain the trim to match my existing decor?

Absolutely! You can easily paint or stain the trim to match your existing decor, adding a personalized touch to your windows. Before proceeding, consider the color palette and design scheme of the room where the windows are located. If you’re aiming for a cohesive look then opt for a paint or stain color that complements the surrounding walls. Remember to prepare the surface of the trim by sanding it lightly and applying a primer. If necessary to ensure optimal paint or stain adhesion. Test your chosen paint or stain color on a small, inconspicuous area of the trim to confirm that it achieves the desired effect. Once you’re satisfied with the color, proceed with painting or staining the trim. Apply even coats and allowing sufficient drying time between layers.

Embark on your DIY window trim journey and watch as your home undergoes a stunning transformation! With a little creativity and a willingness to DIY, you can achieve beautiful results that enhance the overall aesthetic appeal of your space. When you’re finished, be sure to post it on IG and tag me with #howwedoandyoucantoo! I’d love to see your creation.

Looking for more DIY tutorials? Check out more of my DIY projects!

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