In this guide
Windows make a garage nicer to work in — natural light, ventilation, and a building that looks like part of the property instead of a box. They also add cost, reduce wall space and create openings to flash and secure, so it pays to plan them carefully.
Where to put windows
- Workbench walls: A window over a bench gives great light, but you lose wall storage.
- High windows (clerestory): Let in light while keeping wall space and privacy.
- Garage-door windows: A row of glass in the door itself is the easiest way to add light without framing anything.
- Security: Avoid large, low windows that show off your tools to passersby.
Framing a window opening
A window opening is framed much like a door opening, with a few extra pieces:
- King studs full height on each side.
- A header over the opening carried by jack studs.
- A rough sill (a horizontal 2× at the bottom of the opening), supported by short cripple studs below it.
- Cripples above the header up to the top plate if the header doesn’t fill the space.
Size the rough opening from the window manufacturer’s specs — usually about ½ inch larger than the window in each direction.
Flashing a window
Flashing is what keeps water out of the wall.
- Install house wrap first, and cut it so the top flap can be lifted.
- Flash the sill first with flexible flashing tape that laps up the sides.
- Set the window in sealant and fasten its nailing flange.
- Tape the side flanges, then the head flange, then fold the house-wrap flap down over the head flashing and tape it.
The order matters: every layer laps over the one below it so water always runs out.
Buy the window before you frame
Window sizes vary by manufacturer. Buying (or at least choosing) your windows first lets you frame exact rough openings.
Key Takeaways
- Plan windows for light and ventilation without giving up needed wall space.
- Frame with king, jack, sill and cripples; size openings from the window specs.
- Flash from the bottom up so water always laps outward.
Frequently asked questions
Do garage windows need to be tempered glass?
Codes require safety glazing in certain hazardous locations, such as near doors or close to the floor. Check your local code; tempered glass is a sensible choice anywhere a window could be hit by a vehicle, a ladder or a swinging tool.
How high should garage windows be?
Setting the sill around 4 feet above the floor leaves room for a workbench, shelves or storage below while still letting in plenty of light. High clerestory windows add light and privacy.
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