How to Install Basement Windows

Aluminum, vinyl, and fiberglass windows are all easy to install with these step-by-step instructions for basement window installation.

How to Install Basement Windows
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Overview
Basement windows are essential in providing light to a dark, isolated area. Often, however, they're neglected and old and need replacing. Window kits are available to purchase which include an assembled frame and window, as well as the mounting hardware. Follow these tips to learn how to install basement windows.
Step 1
Measure the height and width of the basement window opening with a tape measure. Record the exact dimensions so you know what size kit to purchase. It's a good idea to measure each one, if you are replacing more than one, in case the dimensions are slightly different from one to another.
Step 2
Buy a window kit from a hardware or glass retailer.
Step 3
Remove the sash and frame of the old window. Clean the opening to ensure a perfect fit for the new window. Use a drill to install a piece of metal or wood molding on the inside of the frame to ensure a tight fit. The molding may be included in the kit or you may need to purchase it.
Step 4
Fit the window frame into the opening from the outside of the house. Make sure it sits securely in place. If not, add shims to center it.
Step 5
Screw through the window frame and into the mudsill.
Step 6
Follow the directions and mix the mortar that came in the kit. Trowel it onto the sides and bottom of the window opening. Make sure it is thick and not runny.
Step 7
Apply material along the top of the window to allow for expansion and contraction. Caulk along the top of the window.
Step 8
Allow the mortar to harden. Fit a piece of molding to the outside of the window to ensure a tight fit and no leaks. Caulk around the entire window.
skill
4
ingredient
Tape measure

Molding

Window kit

Shims

Mortar

Trowel

Caulk

Drill or electric screwdriver

ingredients
Tape measure
ingredients
Molding
ingredients
Window kit
ingredients
Shims
ingredients
Mortar
ingredients
Trowel
ingredients
Caulk
ingredients
Drill or electric screwdriver
tip
As an alternative, consider installing glass-block basement windows.
tips
As an alternative, consider installing glass-block basement windows.
warning
Wear eye goggles and gloves when handling power tools.

Be careful when handling glass.

warnings
Wear eye goggles and gloves when handling power tools.
warnings
Be careful when handling glass.
keyword
basement windows install
keywords
basement
keywords
windows
keywords
install

Resources
reference
This Old House
resource
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