How to Trim Out A Basement Window (DIY Guide)

Learn how to Trim Out a Basement Window with this DIY step-by-step guide. For my basement windows, I used the "drywall return" method.

When finishing a basement, you will likely need to install drywall and trim around the basement windows. However, the drywall return method of finishing basement windows requires no trim. Although there are many ways to successfully “trim out” a basement window, using drywall is both a simple and inexpensive method for giving your basement windows a finished look. This article will also show you how to cut a window sill out of common lumber.

To install drywall a drywall return around a basement window, start by cutting drywall for the top and sides of the window. Cut they drywall such that it contacts the window’s frame on one side and so that it is flush with the wall drywall on the other side. Then, install corner bead and finish the drywall with joint compound. Caulk any joints between the drywall and window.

To cut your own window sill for a basement window, select a piece of lumber that is approximately 1.5″ wider than the depth of the basement window cavity. You may need to “rip” the lumber to a suitable width using a table or circular saw. Cut the off the sill so that it is 3″ longer than the window cavity on both sides. Next, use a router to give the window sill a rounded edge and use a jigsaw to cut the penetrations on both sides of the window sill – leaving a 3″ overhang on each side. Finally, caulk any gaps and paint the window sill (if desired)

This video will outline every single step outlined above - in detail.

This Basement Window Replacement and Trim out Project is part of my basement finishing series. See additional videos below:

Episode 1: How to Install Rigid Foam Insulation

Episode 2: How to Frame Basement Walls

Episode 3: How to run electrical in a basement

Episode 4: How to Frame around HVAC and Pipes in a basement

Episode 5: How to Drywall a Basement

Episode 6: How to install LVP flooring in a basement

Episode 7: How to Install a Drop Ceiling

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🎥 MY YOUTUBE GEAR

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🛠🧰 TOOLS THAT I USE

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Thank you so much for watching!

*All content on the Andrew Thron Improvements YouTube channel reflects my own opinions. Please seek out guidance of professionally trained and licensed individuals before making any decisions. Links in the description may be affiliate links.

[RADIO-FREE-AMERICA]

Andrew, hope you are well! Have a good weekend! Thomas!

[leew]

It would help greatly if you did this full screen and not as a short with smaller screen. Not sure I would call a 1 minute video an Episode.

[bartholomewgreatpants]

So how are you screwing the drywall into the block? Or are you only screwing into the outer wall framing and relying on it all to be straight and square? I just redid our basement, literally perfectly boxed every pipe, duct and pole and I have these 2 unsightly windows. I thought I'd use the 1 by's to frame the inside of the window but it made it far too thick and the windows won't open. They've been a real thorn in my side.