Egress Window Requirements in Brampton: Size, Code & Cost (2026)

Raj Renos Inc. · Licensed & WSIB-insured renovation contractor, Brampton · Updated August 2026

Short answer: every basement bedroom needs a window big enough to escape through. Ontario's Building Code (9.9.10.1) requires each bedroom to have an egress window — or a door directly to the exterior — with an unobstructed opening of at least 0.35 m² and no dimension smaller than 380 mm (15"). If you're creating a legal basement apartment, that applies to every bedroom in the unit. Most older Brampton basements fail this on the existing windows, which is why egress work shows up in almost every legalization project we quote.

The numbers that matter

Rule	Requirement
Clear opening area	At least 0.35 m² (about 3.8 sq ft)
Minimum dimension	No side of the opening under 380 mm (15")
Operation	Must open from inside without keys, tools or special knowledge
Window well clearance	At least 550 mm in front of the window
Deep wells	A permanent ladder or steps once the well is deeper than roughly 600 mm
Where it's required	Every bedroom without a door to the exterior — basement or not

The "clear opening" trap. The rule measures the actual open gap, not the window size on the label. A 30"×36" slider can fail because only half of it opens; the same rough opening with a casement window usually passes, because the whole sash swings clear. This is the single most common reason basement windows fail inspection — check the openable area, not the glass.

Do you need a permit?

If the foundation opening is being cut or enlarged — which is the usual case — yes. That's structural work: the City of Brampton will want a site plan, a floor plan showing the bedroom and smoke-alarm locations, an elevation of the wall, and a lintel calculation stamped by an engineer or qualified (BCIN) designer proving the new steel can carry the brick above. Replacing a window like-for-like in the existing opening generally doesn't need a permit. If the egress work is part of finishing or legalizing a basement, it folds into that permit — see our basement permit guide.

What installation actually involves

1. Layout and engineering. Confirm the wall is suitable, locate services, size the lintel.
2. Excavation. Dig the well area down below the new sill height.
3. Concrete cutting. Saw-cut the foundation for the new opening — loud, dusty, done in a day.
4. Steel and window. Install the lintel, frame the opening, set an egress-sized casement or slider.
5. Well and drainage. Install the window well with clearance to code, tie drainage into the weeping tile, add a ladder if the well is deep.
6. Inspections. The City inspects the structural work under the permit.

What it costs

GTA market guides put a full cut-in egress window — concrete cutting, steel lintel, window, well, drainage and finishing — anywhere from roughly $3,000 to $10,000 per opening depending on foundation thickness, soil, depth and access. Enlarging an existing opening costs less than cutting a brand-new one. We quote it fixed, in writing, after one site visit — usually as part of a legal basement apartment scope alongside the separate entrance.

Egress windows and legal basement apartments

For a Brampton second unit registered under the City's ARU program, every bedroom needs a code-compliant egress window unless it has its own exterior door. Inspectors check the openable dimensions, the well clearance and the fire-safety package together — so it pays to plan windows, fire separation and the entrance as one scope rather than piecemeal. That's the approach in our legal basement guide, and it's how we quote.

Adding a bedroom or legalizing a basement in Brampton? We'll measure your existing windows against code in one visit, tell you exactly which openings need work, and give you a fixed written quote — engineering, permit, cutting, window and well included.

Call (647) 771-0806 or visit our basement renovation page. Free, no-obligation estimates across Brampton and the GTA.