OBC-Compliant Foundation Wall Cutting

Egress Windows
Toronto

Transform a dark basement into a legal bedroom or rental suite. BaseWorks cuts the foundation wall opening, installs the structural lintel, sets the window, and completes the window well - permitted, inspected, and finished in 1 to 2 days.

Get Free Assessment (647) 692-2131
OBC Code CompliantPermit ManagedStructural Lintel IncludedFixed-Price Contract

CODE REQUIREMENTS

Egress Windows Toronto - Ontario Building Code Minimums

Every egress window Toronto installation must meet the Ontario Building Code minimum requirements to qualify a basement room as a legal sleeping area. The OBC specifies minimum opening dimensions, sill height from the floor, and accessibility from the inside without special tools or keys. BaseWorks installs to code and manages the permit process with the City of Toronto.

Every egress windows Toronto project includes structural lintel installation, waterproof flashing, and a matching window well to complete the opening.

Our team handles the complete egress windows Toronto permit process - from the building permit application to the final inspection with the City of Toronto.

BaseWorks installs egress windows Toronto homeowners can rely on to meet OBC minimum opening requirements for legal basement bedrooms.

The opening size requirement is based on the unobstructed open area - meaning the space available when the window is fully open. Many standard basement windows do not meet the minimum, which is why egress window installation requires cutting a new, larger opening in the foundation wall.

RequirementOBC MinimumBaseWorks Standard
Unobstructed opening area0.35 m² (3.77 sq ft)0.50+ m² where feasible
Minimum opening width380 mm (15 in)550 mm+ recommended
Minimum opening height380 mm (15 in)600 mm+ recommended
Maximum sill height from floor1000 mm (39 in)Grade dependent
Window well clear width760 mm (30 in) minimum900 mm+ for comfort
Window well depth below sillEqual to window height + 200mm300 mm+ drainage gravel
HardwareOpenable from inside without toolsCasement or awning style
Egress windows Toronto — window frame installation in freshly cut foundation wall

New egress window opening cut through concrete block foundation wall in a Danforth-area semi-detached home. Structural lintel installed above opening before window setting.

Egress windows Toronto — completed window flooding basement with natural daylight
INSTALLATION PROCESS

How BaseWorks Installs Egress Windows in Toronto Foundations

Every egress window Toronto project follows a structured sequence to protect the structural integrity of the foundation wall while cutting the new opening.

1
Assessment and Permit
Window location selected based on foundation wall type, grade height, and interior layout. Building permit applied for with the City of Toronto before any work begins.
2
Lintel Installation
Structural steel or precast lintel installed above the proposed window opening location before cutting begins. The lintel carries the wall load above the new opening.
3
Foundation Wall Cutting
Diamond-blade saw and core drill cuts the foundation wall opening to OBC minimum dimensions. Concrete or block sections removed. Rebar cut and reinforced as required.
4
Window Installation
New casement or awning egress window set into the rough opening. Flashing, air barrier, and insulation installed around the frame per code.
5
Window Well and Drainage
Galvanized or polyethylene window well set against the foundation. Gravel drainage bed at least 300 mm deep installed at the base. Well backfilled and secured to foundation.
6
City Inspection
City of Toronto building inspector confirms the egress window meets OBC requirements. Permit closed. Room is now code-compliant as a sleeping area.

FOUNDATION WALL TYPES

Egress Window Cutting in Toronto's Foundation Wall Types

Toronto homes have three primary foundation wall types, each requiring different egress window cutting techniques.

Poured Concrete (Post-1960)
Most common in Toronto homes built from the 1960s onward. Monolithic concrete wall cut with a diamond blade saw. Rebar locations identified by ground-penetrating radar before cutting to avoid weakening the wall. Structural lintel required above all openings.
Concrete Block (1940s-1960s)
Hollow or solid concrete blocks mortared in courses. Cutting follows block courses where possible to minimize waste and maintain wall integrity. Block walls require careful lintel sizing since they carry distributed load through mortar joints.
Stone (Pre-1940)
Rubble or cut stone foundations in older Toronto homes. Highly variable thickness and no reinforcing. Requires careful hand cutting and substantial lintel support. A structural engineer assessment is recommended before cutting stone foundations.
Egress Window Toronto - Installed Price
$3,500 - $7,000
Per window, including: building permit, foundation wall cutting, structural lintel, window supply and installation, window well, drainage gravel, backfill. Based on foundation wall type, wall thickness, and window well depth required. Fixed-price written quote after free site assessment.

COMMON QUESTIONS

Egress Windows Toronto FAQ

What Toronto homeowners ask about egress window installation.

SERVICE AREAS

Egress Window Installation Across Toronto and GTA

BaseWorks installs egress windows Toronto and throughout the Greater Toronto Area.

East YorkEtobicokeNorth YorkScarboroughMidtown TorontoThe AnnexLeslievilleRiverdaleDanforthThe JunctionRoncesvallesMississaugaVaughan
FREE ASSESSMENT - NO OBLIGATION

Make Your Basement Legal and Bright

BaseWorks assesses your foundation wall type, grade height, and OBC compliance needs - then installs your egress window with permit, lintel, well, and drainage in 1 to 2 days.

Book Free Assessment (647) 692-2131