Basement egress windows are an important safety feature for homes with bedrooms below ground level. Unlike standard basement windows, egress windows provide an emergency escape route if a fire or another emergency blocks access to the stairs.

For Ottawa homeowners, installing an egress window can also bring more natural light into the basement. Before replacing an existing window or creating a new opening, it's worth understanding Ontario's building requirements.

What Makes a Basement Window an Egress Window?

An egress window provides an opening large enough for someone to escape through during an emergency. It must open easily from the inside without keys or tools.

Not every basement window qualifies. Older homes often have small sliding or hopper-style windows that provide ventilation but don't meet emergency escape requirements.

Ontario Building Code Requirements for Egress Windows

Under the Ontario Building Code, a floor level containing a bedroom generally needs at least one qualifying emergency escape window unless a door provides direct access outside.

The window doesn't necessarily need to be inside the bedroom, but occupants must be able to reach it safely.

These measurements apply to the actual unobstructed opening when the window is fully open, not the overall window frame dimensions. Additional requirements may apply to secondary suites and certain basement layouts.

Why Window Wells Matter

Many Ottawa basements sit partially or entirely below ground level. Installing an egress window may require excavating soil to create enough space outside the opening.

A window well provides this clearance while keeping soil away from the window.

Proper drainage matters in Ottawa, where melting snow, heavy rainfall, and freezing temperatures can create moisture problems around basement foundations.

Window wells must also remain clear of snow, debris, and other obstructions.

Do You Need a Permit to Install an Egress Window in Ottawa?

Creating a new basement window opening or enlarging an existing opening in a foundation wall generally requires a building permit.

This work may involve cutting concrete, modifying structural elements, and installing drainage.

The City of Ottawa provides guidance on finishing a basement and related building permit requirements, which homeowners should review before starting renovations.

Replacing an existing window without changing the structural opening may have different permit requirements.

Choosing the Right Basement Egress Window

Casement windows are a common choice because their hinged design can provide a large, unobstructed opening.

Certain sliding windows may also qualify, provided the openable portion meets the required dimensions.

The best option depends on the available wall space, window well clearance, and how easily the window can be operated.

Planning Your Basement Window Replacement

If you're finishing your basement or upgrading older windows, check whether your existing openings meet current safety requirements before ordering replacements.

Northline Windows & Doors helps Ottawa homeowners explore basement window replacement options, including egress windows. Understanding the opening dimensions and installation requirements early can help you choose a suitable window and plan any additional work.

A properly planned egress window can improve basement safety while bringing more natural light into your home.