What window style works best for a stairwell?

Stairwell windows are one of the more interesting design challenges in a home — they need to provide light and visual appeal while being essentially impossible to reach for opening or cleaning.

Fixed (picture) windows are almost always the best choice for stairwells. Since stairwell windows are typically located at awkward heights and angles, operability is rarely practical or necessary, and a fixed window maximizes glass area and light transmission without the mechanical complexity of an operable sash.

Why fixed windows make sense here: Stairwells benefit enormously from natural light — a well-placed fixed window can illuminate an entire staircase from top to bottom. Because you won't be opening it for ventilation, you can prioritize glass area and frame style over function. Fixed windows also tend to be more airtight than operable windows, which matters in Ottawa's Climate Zone 6 winters where every air seal counts.

For shape and configuration, tall narrow windows (portrait orientation) follow the diagonal line of the staircase naturally and look intentional rather than awkward. A single tall fixed window, or a vertical stack of two fixed windows offset along the stair angle, are both popular approaches. Specialty shapes like trapezoids or angled tops can be custom-ordered to follow the roofline if you're dealing with a sloped ceiling situation.

In Ottawa's climate, specify at minimum a double-pane Low-E argon window, but triple-pane is worth the upgrade for any north or east-facing stairwell exposure. Stairwells can be drafty cold zones in winter, so a high-performance unit with a U-factor of 1.22 or lower (ENERGY STAR certified) will make a noticeable comfort difference on the staircase landing.

For cleaning access, discuss placement with your installer before finalizing — even a fixed window needs exterior cleaning, so ladder access or proximity to a roofline should factor into the decision.

Send your stairwell project through Ottawa Window Pros and an installer can help spec the size, shape and glazing package that suits the opening.