Egress Window Installation in Toronto & the GTA

Code-Compliant Basement Egress for Safety and Light

What You Need to Know

Egress windows are one of the most practical upgrades you can make to a Toronto basement — they satisfy Ontario Building Code requirements for bedroom emergency exits, bring natural light into what is often the darkest part of the house, and are a prerequisite for converting basement rooms to legal, rentable living space.

The Ontario Building Code sets minimum egress opening dimensions: the clear opening width must be at least 380mm (15 inches), the clear opening height must be at least 765mm (30 inches), the minimum opening area is 0.35 m², and the sill height from the floor must not exceed 900mm (35.4 inches). These requirements must be met for any room used as a bedroom. An inspector can order a non-compliant basement bedroom vacated.

Installing an egress window involves cutting through the foundation wall — concrete or block — building an appropriately sized window well outside, waterproofing the well and window assembly, and finishing the interior opening with a proper frame, window, and interior trim. Each stage has its own requirements and, done incorrectly, creates a significant chronic leak source at the window perimeter.

Signs You May Need Egress Windows

Basement rooms used as bedrooms with windows smaller than 0.35 m² opening area

Window sills higher than 900mm from the floor in a bedroom

Planning a basement suite conversion and needing OBC compliance

Dark basement rooms that would benefit from natural light

Existing basement windows that are fixed (non-opening)

Why It Happens: Common Causes

Building Code Compliance for Bedrooms

Any room used or intended to be used as a bedroom requires code-compliant egress. Many Toronto homeowners creating basement suites discover their existing basement windows are well below the required 0.35 m² opening area.

Basement Suite Conversion

Legalizing a basement apartment in Toronto requires, among other requirements, proper egress windows in all sleeping areas. Without them, the City will not issue the required occupancy documentation.

Light & Ventilation Improvement

Even without a bedroom conversion, homeowners install egress windows to dramatically increase natural light in dark basements and improve natural ventilation — which reduces moisture and makes the space more liveable.

Property Value Enhancement

A legal basement suite with proper egress, separate entrance, and OBC-compliant construction adds $80,000–$150,000 to resale value in Toronto's market and generates $1,500–$2,500/month in rental income.

Repair Methods & Typical Costs

Core Drilling & Concrete Cutting

$1,500–$3,000 for opening

For poured concrete foundations, diamond core drilling or a track-mounted concrete saw cuts the precise opening required. The wall is reinforced with a proper lintel above the opening to transfer loads around the new void.

Block Wall Removal

$1,000–$2,000 for opening

For block foundations, blocks are removed course by course and the opening is properly linteled with steel or precast concrete.

Window Well Construction

$800–$2,000 per well

A galvanized corrugated steel, polyethylene, or concrete block window well is installed outside the foundation, sized to extend at least 200mm above the finish grade and provide a minimum 600mm from the glass to the well face for emergency exit clearance.

Window Well Waterproofing & Drainage

$500–$1,200 per well

Drainage gravel, a perforated drain pipe connected to the weeping tile or sump, and a protective cover over the well prevent water accumulation. The window frame is flashed and sealed with elastomeric membrane.

Window Supply & Installation

$600–$1,500 per window

A casement or slider window rated for below-grade installation is set in the opening — casement configurations typically provide easier opening operation for emergency use.

Cost ranges are estimates based on Toronto-area market conditions. Actual pricing depends on scope, access, and site conditions. A written quote follows assessment.

Questions About Egress Windows in Toronto

Do I need a permit for egress window installation in Toronto?

Yes. Cutting an opening in a foundation wall is structural work that requires a building permit from the City of Toronto. The permit process typically takes 2–4 weeks and requires submission of a drawing showing the opening dimensions, lintel specification, and window well configuration. We handle the full permit application.

How long does egress window installation take?

The actual installation — cutting the opening, building the well, installing the window and finishing the interior — takes 2–3 days. The permit process adds 2–4 weeks to the timeline. Plan for 4–6 weeks from initial call to completed installation.

Will an egress window cause a leak in my foundation?

Done correctly, no. The risk of window well flooding is real but addressed by the drainage system. The risk of wall-to-frame leakage is real but addressed by proper flashing and elastomeric sealant at the window perimeter. We've seen plenty of improperly installed egress windows that leak — the waterproofing details around the opening are as important as the opening itself.

What's the difference between egress and regular basement windows?

Egress windows meet specific code minimums for opening size, sill height, and operability that allow a person to exit in an emergency. Most original basement windows in Toronto homes — small, fixed slider panes high in the wall — don't qualify. The glass area might be sufficient but if the window can't be fully opened to the minimum clear dimensions, it doesn't meet egress requirements.