An egress window in Ottawa costs $4,500 to $9,500 installed in 2026 for a complete job in a poured-concrete foundation, including excavation, concrete cutting, the window unit, a window well, drainage, and permit. Simpler installs where an existing basement opening only needs enlarging can run $3,000–$5,000, while cutting a brand-new opening in a thick concrete or stone foundation with deep excavation and a large window well commonly reaches $8,000–$12,000. The window unit itself is a small part of the total — typically $700–$2,000 — because most of the cost is labour: saw-cutting reinforced c...
Understanding where the money goes helps you evaluate quotes. In Ottawa for 2026, expect roughly the following line items: the window unit itself at $700–$2,000 depending on whether it is a casement, sliding, or in-swing hopper and whether the frame is vinyl or fibreglass; concrete saw-cutting and opening creation at $1,200–$2,800, which climbs sharply with wall thickness and rebar density; excavation at $800–$2,200 depending on depth, soil, and whether a mini-excavator can reach the wall or the dig must be done by hand in a tight side yard; the window well at $600–$1,800 for a galvanized steel or composite unit, more for a large landscaped or terraced well; drainage connection and gravel base at $300–$800; and framing, waterproofing, interior finishing, and lintel installation at $700–$1,800. Permit and drawing fees typically add $300–$700. A grate or clear polycarbonate well cover — strongly recommended in Ottawa for keeping out snow, leaves, and children — adds $250–$700. Add several hundred dollars if landscaping, a deck, an AC condenser, or a walkway must be moved to reach the wall.
If you are legalizing two basement bedrooms, doing both egress windows in the same visit typically saves 15–25% versus separate jobs, because excavation equipment mobilization, concrete cutting setup, and permit work are shared.
The Ontario Building Code requires every bedroom below grade to have an openable egress window unless the room has a door directly to the exterior or the home is fully sprinklered. The core requirement is an unobstructed openable area of at least 0.35 square metres (about 3.8 square feet) with no dimension less than 380 mm (15 inches), and the window must open from the inside without tools, keys, or special knowledge. The sill height cannot exceed 1.5 metres (about 59 inches) above the finished floor, which is why many Ottawa basements need the opening lowered and enlarged rather than simply swapping the sash. If a window well is present, it must project far enough from the wall to allow the window to open fully and permit escape — a clearance of roughly 550 mm (about 22 inches) in front of the open window is the practical benchmark installers work to. Casement windows are the most common Ottawa choice because they deliver the largest clear opening for a given rough opening, though sliders and in-swing hoppers are also used. Your designer or contractor should show the clear-opening calculation on the permit drawings, not just the window size.
Ontario's rules for legalizing existing secondary suites can be less strict than for new construction in certain respects, but egress remains mandatory for below-grade bedrooms. Confirm your specific situation with a City of Ottawa building official before assuming an exemption.
Yes. Cutting a new opening in a foundation wall — or enlarging an existing one — is structural work, and the City of Ottawa requires a building permit for it. The application generally needs a site plan, a wall section or detail showing the new lintel and how loads are carried around the opening, and the egress calculation demonstrating code-compliant clear opening and sill height. If the egress window is part of legalizing a secondary dwelling unit, it will be reviewed alongside the broader SDU application, which also covers fire separation, smoke and CO alarms, ceiling height, and electrical. Permit fees for a foundation opening are modest — typically a few hundred dollars — but the inspection requirement is the real value: an inspector confirms the lintel is properly sized and installed, which is exactly the detail an unpermitted crew is most likely to get wrong. Skipping the permit means an illegal bedroom that your insurer may not cover in a fire claim, and a title problem when you sell. Any contractor who suggests doing this without a permit should be removed from your list.
In Ottawa, the most common egress window problem is not structural — it is water. You are cutting a hole low in a foundation wall and creating a below-grade pit against it, then subjecting it to spring melt from metres of accumulated snow. The well must be set on a gravel base at least 150–300 mm deep, and that base needs a positive drainage path, either connected to the perimeter weeping tile or into a dedicated drain that carries water away from the foundation. The well itself must be mechanically anchored to the foundation wall with the proper fasteners and sealed at the wall interface. Grade around the well should slope away from the house so surface runoff does not sheet into the opening. A well cover keeps snow and leaves out and is genuinely important here — an uncovered well fills with snow, then melts and pools against a window that was never designed to be a submerged assembly. When comparing quotes, look specifically for gravel depth, the drainage connection method, and the well anchoring detail. Bids that omit these are the ones that lead to a wet basement two springs later.
Egress windows can be installed year-round in Ottawa, but frozen ground makes excavation slower and more expensive. April through November generally yields better pricing and cleaner site conditions.
Egress window work sits at the intersection of several trades — concrete cutting, excavation, window installation, and interior finishing — so the biggest risk is a quote that covers only part of the job. Ask each contractor to itemize: permit and drawings, excavation and spoil removal, concrete cutting and disposal, lintel supply and install, window unit make and model, window well type and size, gravel and drainage connection, well cover, interior framing and drywall return, exterior caulking and finishing, and site restoration including any sod or landscaping. Confirm who is responsible for locating and protecting buried utilities and whether an Ontario One Call locate is included. Get at least three written quotes and expect meaningful spread — a $4,800 bid and an $8,500 bid often describe genuinely different scopes rather than different profit margins, so compare line by line. Verify WSIB clearance and liability insurance, and check that the company has done foundation cutting specifically, not just window replacement. Vetting a contractor thoroughly before signing is the highest-value step in this entire project.
In 2026, a complete egress window installation in Ottawa costs $4,500–$9,500 including excavation, concrete cutting, the window, a window well, drainage, and permit. Enlarging an existing opening can run $3,000–$5,000, while a new opening in a thick foundation with deep excavation can reach $8,000–$12,000.
Yes. Under the Ontario Building Code, every below-grade bedroom needs an openable egress window unless it has a door directly to the exterior or the home is fully sprinklered. Without one, the room cannot legally be used or listed as a bedroom.
The window must provide at least 0.35 square metres (about 3.8 sq ft) of unobstructed openable area with no dimension less than 380 mm (15 inches), open from the inside without tools or keys, and have a sill no more than 1.5 metres (about 59 inches) above the finished floor.
Yes. Cutting or enlarging an opening in a foundation wall is structural work and requires a City of Ottawa building permit, including drawings showing the lintel detail and the egress clear-opening calculation. The inspection confirms the lintel is correctly sized and installed.
The physical work usually takes two to three days once permits are issued: one day for excavation and cutting, one for the window and well installation and drainage, and a partial day for interior finishing. Permit approval typically adds two to six weeks beforehand.
Only if the drainage is done poorly. A properly installed well sits on 150–300 mm of gravel with a drainage connection to weeping tile or a dedicated drain, is anchored and sealed to the foundation, and has grade sloping away plus a cover to keep snow out. Cheap bids that omit gravel depth and drainage details are the ones that leak.