Does My Bloomington Basement Need Them?
A finished basement can be one of the most cost-effective ways to add more space to your Bloomington home. It can be an a good area for bedrooms, a family room or a playroom.
As you plan your basement remodeling project, keep in mind you may need to install wider windows. Egress windows are large openings that offer another way out in an emergency. They can also add more natural light and make your basement feel more welcoming.
Basement bedrooms and living spaces must have egress windows. Living rooms can be offices, TV rooms or workshops. This rule also affects unfinished basements.
Why Are Egress Windows Important?
Basement fires happen regularly, with firefighters responding to about 6,500 of them in the U.S. annually.
There’s not a lot of time to flee a house fire. It can become fatal in as little as 2 minutes and overwhelm a home within 5 minutes, according to the National Fire Protection Association.
When you only have minutes to get out, correctly sized egress windows are an important secondary exit.
Basement Windows in Older Homes May Be Too Small
Basements in older homes were not intended to be sleeping or living areas. This is especially true for homes built 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 have preceded up-to-date 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 referred to 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 climb through.
How to Measure Your Basement Windows
Not sure if your existing basement windows meet present-day requirements? All you need is a tape measure.
- Open the window as wide as possible.
- Measure the width and height of the opening.
- Multiply the width by the height.
Does your measurement match 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 fast 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 below ground level, you will need to have a well dug at the base 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 simple to install steps. Plus, you can incorporate a couple small landscaping features, like crushed rock or potted plant.
It's acceptable for basement windows to be under a deck or porch. But there needs to 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 an exit, they must open from the inside. Any screens, grilles or bars need to be removable from the inside without keys or tools.
It’s also vital that basement windows can fully open. The window sash shouldn’t impede the opening. This allows your family to quickly exit—or first responders to quickly enter.
Local requirements for basement windows may differ. Check with Bloomington building officials to learn more about area guidelines.
Choosing Basement Egress Windows
There are several kinds of windows that work well for basements and fulfill building code requirements.
Casement windows are a good option for limited wall space. These windows operate like a door, swinging free to provide a spacious opening.
Casement windows open by rotating a handle. Pella® casement windows incorporate a crank that folds away. That way, the crank won't disrupt curtains.
This window must have at least 8 square feet of net opening.
Sliding windows are great for adding more light to spacious basements. These windows have to be bigger, because the opening is only half as wide as the window. This is due to the sash, which slides horizontally.
Sliding windows open by pushing the sash from left to right. Some Pella models include 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 Bloomington
Basement escape windows are a must-have for downstairs living spaces. They can be lifesaving equipment in an emergency. Meet with our professionals at Pella of Bloomington. We can help when you're remodeling your basement.
We can also help you find the right window that matches your project, budget and local egress requirements.