Egress Window Installation Cost Toronto & GTA 2026: Code-Compliant Basement Conversions

OCM Excavation cuts foundations and installs code-compliant egress windows across Toronto and the GTA, almost always tied to a basement bedroom legalization or a secondary suite registration. The honest 2026 egress window installation cost Toronto range is $5,500 to $11,000 per opening, all-in: excavation, concrete saw cut, window, well, drain, and landscape restore. A casement window swap into an existing properly-sized opening is cheaper at $1,800 to $3,500. Call 416-317-3090 for a site walk, or request a free quote online.

Why Egress Windows Matter in Toronto Basements

An egress window is not a luxury upgrade. It is the difference between a legal basement bedroom and an uninsurable one. Ontario Building Code Section 9.9.10 requires every bedroom in a finished basement to have an outside window large enough for a person to climb out of, or a separate exterior door. No egress, no legal bedroom. Realtors call this out on listings, insurance adjusters flag it after claims, and Toronto Building inspectors fail finished-basement permits over it every week.

The secondary suite story is bigger. Toronto legalized secondary suites city-wide in 2018, and the registered program treats egress as a hard checklist item. Vaughan permitted detached-home secondary suites starting in 2020. Richmond Hill runs a registration program with the same egress requirement. Markham mirrors Toronto. Mississauga has had a secondary suite bylaw since 2014. If you are converting a basement to a rental unit anywhere in the GTA, egress is the gating item. We have installed dozens of these for homeowners turning basements into legal income suites.

Ontario Building Code 9.9.10: The Numbers You Need to Hit

The OBC numbers are not negotiable. The inspector measures the unobstructed opening with the sash fully open, not the rough opening or the glass area. The thresholds that matter:

• Minimum unobstructed opening area: 0.35 m² (3.77 sq ft) with the sash open
• Minimum opening width: 380 mm (15 inches)
• Maximum sill height above floor: 1.5 m (about 59 inches), or steps must be provided
• Window well projection if used: minimum 760 mm (30 inches) from the foundation
• Window well clearance: the open sash must swing or slide fully without blocking egress
• Drainage: the well must drain to weeping tile or daylight, not pool against the foundation

Two combinations work in real basements. A large casement with a 380 by 920 mm opening clears the area requirement. A horizontal-slider style needs more width because only half the unit opens. We size every quote against the actual layout, not a generic spec sheet.

Cost Breakdown by Component

An honest egress quote itemizes six lines. Bundle them at your peril. The 2026 GTA component costs:

• Excavation per opening (typical 4 x 4 x 6 ft pit): $1,500 to $3,500. Hand-dig in tight side-yards costs more than machine-dig in open backyards.
• Concrete saw cut foundation: $1,200 to $2,500 per opening. Older poured-concrete or block walls vary in thickness and reinforcement.
• Code-compliant casement window unit: $1,800 to $3,500 supplied. Vinyl frame, double-glazed, lifetime warranty options sit in the middle of the range.
• Window well plus drain: $800 to $2,200. Galvanized steel is the budget option; composite or stone-finish wells run higher.
• Restore landscape and finish: $500 to $1,500. Sod, shrub replanting, paver reset, downspout re-routing.
• Permit and engineering review: $300 to $900 depending on city and whether a structural lintel sign-off is required.

Add the lines and a single-opening egress install lands at $5,500 to $11,000 in 2026 Toronto and GTA pricing. Two-opening jobs (corner bedrooms, basement apartments with two legal sleeping rooms) get a small mobilization discount on the second unit, typically $800 to $1,500 less per opening because the crew and equipment are already on site. Our window well excavation cost guide goes deeper on the pit and well portion if you already have the right window.

Toronto Secondary Suite Bylaw: When Egress Is Mandatory

Toronto registered secondary suites are governed by the city’s Registered Secondary Suites Program. The program treats egress as a hard pass-fail item, alongside fire separation, smoke alarms, ceiling height, and a separate entrance. There is no inspector discretion on the egress numbers. Either the opening hits 0.35 m² with a 380 mm width or it does not.

York Region (Vaughan, Richmond Hill, Markham, Aurora, Newmarket, King City) uses parallel rules under each town’s secondary suite bylaw. The Region of York secondary suite guide consolidates the requirements. Mississauga and Brampton in Peel Region run their own registration programs with the same OBC 9.9.10 trigger. If the basement is going to be rented, the egress install is not optional. If the basement is being finished for family use, the inspector still applies 9.9.10 to any bedroom on the permit drawing.

Common Mistakes That Trigger Permit Rejection

Toronto Building inspectors have seen every shortcut. The patterns that fail inspection:

• Window sized to the rough opening, not the unobstructed opening. A 24 by 36 inch sash that only opens halfway gives you 432 sq inches of clear opening, well under the 540 sq inch (3.77 sq ft) threshold. Inspector measures the open sash.
• Window well too shallow. A 18 inch projection well does not let the sash open or a person climb out. Minimum 760 mm (30 inches) measured from foundation face.
• No drain or drain pointed at the foundation. Wells must drain to weeping tile or daylight away from the wall. A well that holds water is a foundation leak waiting to happen.
• Sill more than 1.5 m above the finished floor with no steps. Permanent built-in steps inside the basement are usually the fix, not a stack of milk crates.
• Saw cut made before permit issuance. Cutting the foundation first and applying for the permit after is a fast way to get a stop-work order and an order-to-comply.
• Utility locate skipped. Buried gas, hydro, telecom, and weeping tile lines run along foundation perimeters. ON1Call locate is free and mandatory.

We work through this checklist before the saw touches concrete. The locate, the permit, the engineered lintel detail if the opening exceeds the original window rough opening width. The order matters. Our foundation waterproofing crew handles the membrane and weeper tie-in at the same time, which saves a second mobilization later if the wall is already exposed.

How to Get an Honest Egress Window Quote in the GTA

An honest quote arrives after a site visit, not over the phone. The contractor needs to see the foundation wall type (poured concrete, block, or brick over block), the side-yard access for an excavator or hand-dig, the existing window, the basement floor elevation against grade, the location of buried utilities, and the landscape that needs restoration after.

Ask the contractor three questions on the visit. One: are you pulling the permit, or am I? Two: is the engineered lintel detail included or extra? Three: what does the warranty cover on the waterproofing tie-in, separate from the window warranty? Vague answers usually mean a line item is missing and will show up as a change order later. We have walked behind too many cheap quotes where the homeowner paid $4,000 more in adds.

A real GTA example from last season. We installed a single egress window for a homeowner in Vaughan converting the basement to a registered secondary suite. Poured concrete foundation, side-yard access tight at 1.1 metres, existing 24 by 16 inch hopper window. Hand-dig excavation over two days ($2,800), concrete cut to 38 by 48 inches ($1,800), code-compliant casement unit, vinyl frame, two-pane low-e ($2,400 installed). Galvanized steel well, 30 inch projection with French-drain tie-in to existing weeping tile ($1,400). Vaughan permit $480. Landscape restore $700. Total invoice $9,580. The inspector signed off on the first visit, and the homeowner’s rental income started six weeks later.

City-by-City Notes Across the GTA

Egress window installations across the region tie to our city pages: Toronto, Richmond Hill, and the broader GTA. Toronto demand sits highest because of the 2018 secondary suite legalization across the city. Vaughan has accelerated since the 2020 detached-home rule change. Richmond Hill registrations are steady. Markham requirements parallel Toronto. Mississauga has the longest-running secondary suite bylaw of the bunch (2014) and inspectors there know the OBC 9.9.10 numbers cold. See also our walk-up basement conversion cost guide if a separate entrance is part of the same project.

Frequently Asked Questions

What size egress window does Ontario Building Code require?

Ontario Building Code Section 9.9.10 requires an unobstructed opening of at least 0.35 m² (3.77 sq ft) with the sash fully open, and a minimum opening width of 380 mm (15 inches). The sill cannot sit more than 1.5 m above the basement floor without permanent steps. A code-compliant casement window roughly 38 by 48 inches usually hits the targets, but the inspector measures the open sash, not the rough opening, so the unit has to be specified correctly.

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

Yes. Any cut to a foundation wall or any enlargement of an existing window opening in a load-bearing wall requires a building permit from Toronto Building. The application usually includes a structural detail showing the lintel above the new opening and a drainage detail for the window well. Most GTA municipalities follow the same rule. Cutting first and applying after is the fast way to a stop-work order and a costly fix. Permit fees run roughly $300 to $900 depending on city and scope.

Can I convert a basement to a bedroom without egress?

Not legally. Ontario Building Code 9.9.10 requires every bedroom to have either an outside window meeting the egress dimensions or a direct exterior door. Without one, the room cannot be listed or used as a bedroom on a permit drawing, on an MLS listing, or as part of a registered secondary suite. Insurance claims after a basement fire frequently get reduced or denied if the bedroom lacked legal egress. The cost of doing it right is small against that exposure.

How long does egress window installation take?

On site, 1 to 3 days per opening once the permit is in hand. Day one is excavation and locate verification. Day two is the concrete saw cut, window install, well placement, and drainage tie-in. Day three is backfill, waterproofing tie-in, and landscape restore. Off site, allow 2 to 5 weeks for the permit application, the engineered lintel detail if required, and the utility locate clearance. Tight side-yard access can add a day of hand-dig.

Should the well drain to the weeping tile or daylight?

Either works under the OBC, but the right answer depends on your foundation drainage. If the existing weeping tile is functional and the sump pump can handle the extra inflow, a tie-in is the cleaner solution. If the lot slopes away from the foundation, a daylight drain run is sometimes simpler and avoids loading the sump. What is not acceptable is a well that holds water against the foundation. That is a leak guaranteed within a couple of freeze-thaw seasons.

Is an egress window cheaper than enlarging an existing window?

Usually they are the same job. Most basement “egress installations” are actually enlargements of an existing undersized basement window. The saw cut, the lintel, the larger well, the new window, the excavation, the drainage tie-in are all the same scope whether you are putting in a first window or enlarging an old one. The only true cost savings come from skipping the excavation entirely, which is only possible if the existing rough opening is already big enough, and that is rare in pre-2000 GTA homes.

Ready to Make Your Basement Bedroom Legal?

Call 416-317-3090 for a site walk and itemized quote, or request a free quote online. We install code-compliant egress windows across Toronto, Vaughan, Richmond Hill, Markham, Mississauga, Brampton, Oakville, Aurora, Newmarket, and King City. Pairing the egress with a basement waterproofing scope? See our foundation waterproofing page and our Toronto excavation contractor hub for the full picture.