What happens if my Toronto basement bedroom window meets the size requirement but the sill is too high?

If your basement bedroom window meets the size requirement but the sill is too high (above 44 inches from the floor), it does not meet Ontario Building Code egress requirements and cannot legally be considered a bedroom window. The room cannot be called a bedroom until this is corrected, and more importantly, occupants cannot safely escape in an emergency.

The Ontario Building Code is very specific about egress windows in basement bedrooms: the window must have a minimum unobstructed opening of 3.77 square feet, minimum width of 15 inches, AND the sill height cannot exceed 44 inches from the floor. All three requirements must be met simultaneously — meeting just one or two isn't sufficient for life safety.

Your options to correct a high sill depend on your foundation type and current window configuration. If you have a standard basement window that's simply mounted too high in the foundation wall, the most common solution is cutting the foundation wall lower to install a larger egress window with proper sill height. This involves saw-cutting the concrete or block foundation, installing a new window buck, and waterproofing the enlarged opening. Cost typically ranges $3,000-$6,000 per window in the GTA.

For homes with very high foundations or challenging layouts, lowering the basement floor around the window area might be necessary. This creates a small recessed area (essentially a mini window well inside the basement) that brings the effective sill height down to code compliance. This is more complex work requiring careful waterproofing and proper drainage to prevent water collection in the lowered area.

Window wells are critical for below-grade egress windows. The exterior window well must be large enough for a person to climb out and for firefighters to access — minimum 9 square feet of horizontal area. The well needs proper drainage (connected to weeping tile or separate drain) and a ladder or steps if the well is deeper than 24 inches. Many GTA homes have undersized window wells that need enlargement when upgrading to egress windows.

This work requires both a building permit and structural consideration. Cutting foundation walls affects the structural integrity of your home, especially in older Toronto houses with stone or block foundations. A structural engineer may need to specify reinforcement around the new opening. The electrical rough-in for the bedroom also needs ESA inspection, and any plumbing work requires a licensed plumber.

Timing matters significantly in the GTA. Exterior excavation for window well work is best done between May and October when ground conditions are favorable. Interior work can proceed year-round, but coordinating the interior finishing with exterior window well construction requires careful planning to maintain weatherproofing.

The high sill issue is extremely common in older GTA homes, particularly pre-1970s houses in Toronto, Scarborough, and North York where basement windows were installed primarily for light and ventilation, not emergency egress. Modern building codes prioritize life safety, making egress window upgrades one of the most frequent basement renovation requirements.

Never compromise on egress window requirements — this is life safety, not just a code technicality. A bedroom without proper egress puts occupants at serious risk and creates liability issues for homeowners. Most basement renovation contractors in the GTA have extensive experience with egress window installations and can provide accurate assessments of your specific situation.

Need help finding a basement contractor experienced with egress window installations? Toronto Basement Remodeling can match you with local professionals who specialize in bringing basement bedrooms up to current Ontario Building Code requirements.