Basement Windows
Most basement windows are slider windows—and most projects are retrofit replacements sized to your existing concrete opening. We focus on correct fit, clean sealing, and a finished look that holds up over time. If your basement includes a bedroom, we can also plan an egress-capable window option.
What we focus on for basement windows
- Retrofit fit — accurate sizing to the existing opening
- Window well compatibility — sliders stay clear (no outward swing)
- Sealing & finish — clean trim + long-term performance
- Egress planning — opening + well clearance need to work together
Basement Slider Window Replacement
Slider windows are a popular basement choice because they don’t swing into window wells and they offer great everyday ventilation.
No outward swing
Sliders open side-to-side, so the sash stays clear of the window well—simple and practical.
Common basement installation method
Most basement projects are retrofit installs sized to existing openings. We confirm fit and sealing on-site.
Strong performance for the budget
Slider windows are one of the best-value operable window styles—great for airflow and everyday comfort.
Egress Windows for Basement Bedrooms
Ontario egress requirements focus on the clear open portion and the window well clearance. We plan the window style and sizing together so it’s practical and code-aligned.
Egress window requirements (summary)
- Must be openable from the inside without the use of tools
- Must provide an unobstructed open portion of at least 0.35 m²
- No dimension of the unobstructed open portion can be less than 380 mm
- Must maintain the required opening without additional support
- Except for basement areas, maximum sill height is 1000 mm above the floor
- If it opens into a window well: provide at least 550 mm clearance in front of the window
- If the sash swings toward the well: it must not reduce clearance in a way that restricts escape
- If there’s a protective cover/enclosure over the well: it must open from inside without keys/tools/special knowledge
- For sliding windows: the minimum dimension rule applies to the openable portion
Slider vs. casement for egress
Both sliders and casements can work for egress when the clear open portion meets requirements. The best choice often depends on window well space and the opening you can achieve in the same rough opening.
- Casement windows can open wide (often close to 90°), which can make it easier to achieve the required clear opening with a smaller overall window size in some layouts.
- Slider windows are excellent when space is tight because nothing swings outward—but since only part of the window opens, the overall unit may need to be larger to hit the same clear opening.
- When there’s a window well (and especially a cover), we verify that the open window + well clearance still allows safe escape.
Basement Window FAQ
Quick answers to common basement window replacement questions.
Are basement slider windows a good choice?
Yes. Sliders are popular in basements because they don’t swing into window wells, they ventilate well, and they’re a strong value option.
Can a sliding window meet egress requirements?
It can, as long as the clear open portion meets the required minimum area and minimum dimension rules (which apply to the openable portion).
Are casement windows better for egress?
Often, yes—casements can open wider, which can help achieve the required clear opening in a smaller overall unit, depending on layout and well clearance.
Do basement egress windows need a window well clearance?
When the egress window opens into a window well, the well needs adequate clearance in front of the window to allow escape.