What does a basement second egress cost in Ottawa?

A basement egress window installation in Ottawa typically costs between $1,500 and $4,500, depending on the size of the opening, soil conditions, and whether a window well is required.

Egress windows are one of the most common upgrades we see on basement finishing and secondary suite projects. The wide price range reflects some real differences in scope — cutting through a poured concrete foundation wall is significantly more labour-intensive than cutting through a block foundation, and homes with deeper window wells or poor drainage conditions add complexity quickly.

What's typically included in that price range:

• $1,500–$2,200 (low end): Basic installation in a block foundation with minimal excavation, standard-size window (minimum 0.35m² opening per OBC), and a simple window well
• $2,200–$3,200 (mid range): Poured concrete foundation cut, proper window well with drainage gravel, egress-compliant casement or slider window, and lintel installation
• $3,200–$4,500+ (high end): Deep excavation, large window well with cover, waterproofing membrane, interior framing and finishing, or difficult access conditions

The Ontario Building Code (OBC) sets the minimum requirements for egress windows — the opening must be at least 0.35 square metres, with no dimension less than 380mm, and the sill height cannot exceed 1,000mm from the finished floor. These aren't optional — they're life-safety requirements that apply to any bedroom in a finished basement or secondary suite.

A City of Ottawa building permit is required for egress window installations. This isn't something to skip — the permit triggers an inspection that confirms the window meets OBC requirements, which matters enormously if you're renting the unit or ever selling the home. Permit fees are typically $150–$300 for this scope of work.

From a seasonal standpoint, Ottawa's clay-heavy soil and frost conditions mean spring and summer are the best time to do exterior excavation for window wells. Late fall work is possible but adds cost if the ground is frozen or saturated.

This is not a DIY project. Cutting a foundation wall — whether block or poured concrete — requires structural assessment, proper lintel sizing, and concrete cutting equipment. Done incorrectly, it can compromise the structural integrity of your foundation. Always use a licensed contractor who will pull the proper permit.

If you're adding an egress window as part of a basement finishing project or secondary suite conversion, the cost is often bundled into the overall renovation scope, which can make it more economical. Ottawa Basements installs egress windows as part of our basement finishing and secondary suite projects — contact us for a free on-site estimate to get an accurate number for your specific foundation type and conditions.