What Are Egress Windows?
Does My Boise Basement Need Them?
A finished basement can be one of the easiest ways to add extra space to your Boise home. It can be an a great area for bedrooms, a family room or a playroom.
As you plan your basement remodeling project, keep in mind you may need to put in wider windows. Egress windows are large openings that give an escape route in an emergency. They can also add more natural light and make your basement feel more appealing.
Basement bedrooms and living spaces are required to have egress windows. Living rooms can be offices, TV rooms or workshops. This mandate also involves unfinished basements.
Why Are Egress Windows Important?
You don’t have much time to escape a house fire. It can become deadly in only 2 minutes and overwhelm a home within 5 minutes, according to the National Fire Protection Association.
When you only have minutes to escape, big egress windows are a crucial altermative exit.
Basement Windows in Older Homes May Be Too Small
Basements in older homes were not created to be sleeping or living areas. This is especially true for homes made before World War II.
Homeowners back then used this kind of basement for utility space, laundry and storage.
Depending on its age, your home may predate today’s egress window requirements. Or it may have windows with a shorter opening.
If you live in an older home, there’s a good possibility it has narrow windows in the basement. Also known as hopper windows, these above-ground windows open inward to circulate fresh air.
But these windows are small—too small for an adult or fully-geared first responder to fit through.
How to Measure Your Basement Windows
Unsure if your existing basement windows meet present-day requirements? All you need is a tape measure.
- Open the window fully.
- Measure the width and height of the opening.
- Multiply the width by the height.
Is your measurement equal to the required 821 square inches—or 5.7 square feet? If not, you need to have bigger windows installed.
Requirements for Egress Windows in Basements
Building codes mandate the size of basement windows. This allows for a quick exit in an emergency.
According to the International Residential Code, basement windows must have:
- An opening width of at least 20 inches.
- An opening height of at least 24 inches.
- A net clear opening of at least 821 square inches—or 5.7 square feet.
- A sill no more than 44 inches off the floor.
What if My Basement Windows are Below Ground Level?
If your basement windows are beneath ground level, you will need to have a well dug at the bottom of the window frame. This well should be at least 36 inches wide and 36 inches long. If the well is more than 44 inches deep, it will need a fixed ladder or steps.
Using timber or concrete blocks in the well makes it uncomplicated to add steps. Plus, you can add a few small landscaping features, like crushed rock or potted plant.
It's acceptable for basement windows to be under a deck or porch. But there must be enough space for an average-sized adult to exit.
There should be at least 36 inches between the top of the window well and the bottom of the deck or porch joists.
Other Requirements for Egress Windows in Basements
Because basement windows are a way out, they must open from the inside. Any screens, grilles or bars need to be taken off from the inside without keys or tools.
It’s also vital that basement windows can completely open. The window sash shouldn’t obstruct the opening. This allows your family to quickly exit—or first responders to quickly enter.
Local requirements for basement windows may differ. Check with Boise building officials to learn more about area guidelines.
Choosing Basement Egress Windows
There are several kinds of windows that work well for basements and satisfy building code requirements.
Casement windows are a good option for not a lot of wall space. These windows work like a door, swinging free to provide an ample opening.
Casement windows open by turning a handle. Pella® casement windows feature a crank that folds away. That way, the crank won't get in the way of curtains.
This window must have at least 8 square feet of net opening.
Sliding windows are great for adding more light to large basements. These windows have to be wider and taller, because the opening is only half as wide as the window. This is due to the sash, which slides horizontally.
Sliding windows open by shifting the sash from left to right. Some Pella models have extra-durable tandem nylon rollers. These rollers provide even easier operation.
This window must have at least 16 square feet of net opening.
Talk with the Professionals at Pella of Boise
Basement escape windows are a must-have for downstairs living spaces. They can be lifesaving equipment in an emergency. Talk with our professionals at Pella of Boise. We can help when you're remodeling your basement.
We can also recommend the right window that matches your project, budget and local egress requirements.