Why Every Finished Basement Should Have an Egress Window

In this basement, there were only two small windows to start with. As part of the renovation, we're enlarging both of them, which means opening up the foundation wall and installing new units that bring in more light and, just as importantly, provide a safe way out in an emergency. For us as a renovation contractor, that second part is just as important as how the basement looks on reveal day.

Basements are a big part of how families in Ontario use their homes. When you finish a basement, you're not just adding living space. You're creating another place where people sleep, relax, watch movies, or work from home. That’s why we think every finished basement should have at least one proper egress window.

What we did in this basement

On this project, we're enlarging the existing basement windows and turning one of them into a proper egress window. To do that, we need to do more than just swap out the glass.

First, we open up the framed wall inside, which is relatively straightforward. On the outside, this home has brick and a concrete foundation. Our window crew cuts the foundation opening to the new size, then we install a proper window well with gravel and a drain that ties into the existing weeping tile. This helps move water away from the foundation and keeps the window area dry.

Once the structure is opened up, we install the new windows, including one that meets egress requirements. That means it can open wide enough for someone to climb out easily and safely if they ever need to.

What is an egress window and why does it matter?

An egress window is a window that’s sized and installed so people can use it as an exit in an emergency. In a basement, that usually means a window big enough to climb through, low enough to reach, and easy to open without tools or keys. It often sits in a window well that provides enough clearance to get out safely.

In a typical basement, the only way in or out is the staircase. If there's ever a fire or another emergency that blocks that stairway, anyone in the basement needs another way out. An egress window gives them that second means of exit.

In our opinion, every finished basement should have at least one egress window. It's not just about meeting code. It's about giving your family a safe way out if something unexpected happens.

How egress windows improve a finished basement

Safety is the main reason to add an egress window, but it's not the only benefit. A larger basement window also brings in more natural light, which makes the space feel more like the rest of the home and less like a basement.

That extra light is especially important if you're using the basement as a family room, media room, office, or guest space. It can also be a key part of using the basement as a bedroom or potential future rental space, because building codes expect a safe and usable second exit in those situations.

When you pair a well-planned basement layout with better natural light and a proper escape route, the lower level starts to feel like a true extension of the main floors instead of just storage and utility space. That's what we aim for on our basement renovation projects.

What goes into doing this work properly

Cutting into a foundation wall isn't a small task. We need to think through how the opening is created, how water will drain away, how the window well is built, and how everything ties back into the rest of the renovation.

On a typical egress window install during a basement renovation, we:

• Open up the interior framing and protect the surrounding area.
• Cut the foundation to the new opening size and deal with brick or siding outside.
• Install a properly sized window well with drainage and gravel.
• Connect a new drain line into the existing weeping tile so water doesn’t sit against the foundation.
• Install the new window so it opens easily and gives enough clear opening for escape.
• Finish the interior framing, insulation, and trim so the window looks like it was always meant to be there.

Handled properly, this work improves both the safety and the comfort of the basement. Handled poorly, it can lead to water issues, cold spots, or a window that technically exists but doesn’t work when you really need it.

Thinking about a basement renovation?

If you're planning to finish your basement or update an older lower level, it's a good time to think about adding or enlarging a basement window and making at least one of them an egress window. It’s an investment in safety, comfort, and long-term usability of the space.

Bosch Services is a renovation contractor that helps homeowners in Burlington, Oakville, Milton, and Waterdown with thoughtful interior renovations, including finished basements that feel like a natural extension of the rest of the home. You can see how we transform lower levels in our project galleries, learn more about why homeowners choose Bosch, read client testimonials, or contact Bosch Services to talk about your own basement renovation.