Egress Window Installation Cost in the GTA (2026)

A complete egress window installation in Toronto — concrete cutting, the window itself, the well, waterproofing, and the permit — typically runs $3,000-$7,000 per window as of 2026. Complex structural cuts push that to $4,000-$10,000, while simpler installs elsewhere in Ontario start around $2,500-$4,500.

The spread comes down to what is in the wall and what sits outside it. Enlarging an existing opening in poured concrete with easy backyard access lands near the bottom. Cutting a brand-new opening through a thick foundation under a load path, with a deep well and drainage tied into the weeping tile, lands near the top.

Budget per window, not per project. A basement with two bedrooms usually needs its own compliant opening for each sleeping room, and a full legal basement apartment has egress requirements woven through the whole design. One good window is often the single line item that turns a finished basement into legally usable bedroom space — which is why it earns its price.

The logic behind the rule is fire. A basement bedroom needs a second way out when the stairs are cut off, and the Ontario Building Code — section 9.9.10.1 — spells out exactly what that escape route must be: an unobstructed clear opening of at least 0.35 square metres, roughly 3.8 square feet, with no dimension smaller than 380 millimetres (15 inches), openable from inside without tools or keys.

Note the word clear. A window that measures large on the sticker can still fail once the sash and hardware eat into the opening. Casement windows that crank fully open usually deliver the most clear area from the smallest rough opening, which is why they dominate basement retrofits.

For rental units the stakes go past inconvenience. An unregistered suite with undersized windows is not grandfathered by time or good intentions; it fails at inspection, and it fails when an insurer or buyer looks closely. We cover the measurements in detail in egress window size requirements in Ontario, and how egress fits the bigger picture in whether your basement is legal-suite ready.

Most of the cost lives in the cut. Sawing a precise opening through a foundation wall takes specialized equipment, dust and water management, and a plan for what holds the house up while the wall is open.

Three variables move the number most. Wall construction first: poured concrete cuts predictably; concrete block needs the cores addressed; the rubble and brick foundations under pre-war Toronto homes are the slowest and most careful work. Second, whether an opening exists — enlarging a window downward is far less involved than cutting fresh through a blank wall. Third, what is above the opening: a new lintel must carry the load across the cut, and where the opening sits under significant structure, an engineer designs it.

This is also why the GTA's post-war suburbs are fertile ground for egress projects. The 1950s-70s bungalows and back-splits across Scarborough, North York, and central Etobicoke usually have taller basement walls than downtown Victorians, so the cut is shallower and the well smaller — the geometry that keeps projects near $3,000-$5,000 instead of drifting toward five figures.

Below grade, every egress window needs a well, and the code has opinions about that too: roughly 760 millimetres (30 inches) of clearance in front of the window, so an adult can actually climb out rather than just admire the opening.

The well is also where cheap installs fail. Cutting a hole below grade and not managing the water that collects there is how a safety feature becomes a leak. A proper well gets a gravel base with a drain tied into the weeping tile or sump, the cut edges sealed and flashed, and backfill graded away from the house. GTA freeze-thaw is unforgiving here — water pooling in a well in November becomes ice pressing on your new window frame by January.

Covers deserve a moment of attention. A clear cover keeps leaves, snow, and raccoons out while letting light through, but it must be openable or removable from inside without tools — a bolted-down cover quietly undoes the code compliance you just paid for. If the window serves a sleeping room in a second suite, keep the escape path obvious and unobstructed.

Cutting a new opening in a foundation, or enlarging an existing one, is structural work — it requires a building permit everywhere in the GTA. This is not a formality worth dodging: the permit is what proves, to a future buyer or insurer, that the lintel over the cut was designed and inspected rather than improvised.

Costs and process vary by municipality. In Milton, a new window or door opening is a flat $264.20 permit as of the current schedule; Toronto prices interior and structural alterations by work area with a $214.79 minimum, and small basement scopes often land within a few hundred dollars. Toronto's Express Services stream (formerly FASTRACK) covers basement work, with examiner review in about three business days for clean submissions. Where the opening carries meaningful load, expect the city to ask for engineered drawings.

If the window is part of a second-suite project, the permit picture widens to include fire separation requirements for basement apartments and more. Our building permit guide walks through how the pieces fit.

Since you are paying to cut concrete anyway, place the window where it earns double duty. A south- or west-facing well pulls real afternoon light into a basement; the same window on the shaded north face meets code and little else. Put the opening where the future room wants it — beside the bed wall, not behind the furnace — and size the well generously, because a wider well with a decent depth reads as a light shaft rather than a pit.

On back-splits, check the rear grade first: the lower level often sits nearly at grade in the backyard, and what would be a $7,000 cut at the front becomes a modest window swap at the rear.

When egress makes sense as a standalone project: you are legalizing an existing bedroom, or protecting a suite investment. When it belongs inside a bigger scope: any full basement build, where cutting before finishing avoids redoing drywall and trim. Costs for the whole picture are in our basement renovation cost guide — and if you are planning bedrooms down there, this is the item to price first, because everything else in the plan depends on it.