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...
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 ...
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...
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 mechanic...
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 ...
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.