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What Are Egress Windows?

What Are Egress Windows?

Does My Lafayette Basement Need Them?

A finished basement can be one of the most cost-effective ways to add more space to your Lafayette home. It can be an an ideal area for bedrooms, a family room or a playroom.

As you get ready for your basement remodeling project, keep in mind you may need to add larger windows. Egress windows are large openings that provide 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 areas can be offices, TV rooms or workshops. This requirement also applies to unfinished basements.

Why Are Egress Windows Important?

Basement fires are common, with firefighters being called to about 6,500 of them in the U.S. every year.

There’s not a lot of time to get out when there’s a house fire. It can become fatal in just 2 minutes and engulf a home within 5 minutes, according to the National Fire Protection Association.

When you only have minutes to escape, correctly sized egress windows are an important secondary exit.

Basement Windows in Older Homes May Be Too Small

Basements in older homes were not designed to be sleeping or living areas. This is especially true for homes constructed before World War II.

Homeowners back then used this style of basement for utility space, laundry and storage.

Depending on its age, your home may have preceded today’s egress window requirements. Or it may have windows with a smaller opening.

If you have an older home, there’s a good likelihood it has short 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-outfitted first responder to fit through.

How to Measure Your Basement Windows

Unsure if your current basement windows meet today’s requirements? All you need is a tape measure.

  • Open the window completely.
  • Measure the width and height of the opening.
  • Multiply the width by the height.

Is your measurement equivalent 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 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 underneath 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 permanent ladder or steps.

Using timber or concrete blocks in the well makes it easy to install steps. Plus, you can incorporate a couple small landscaping features, like crushed rock or potted plant.

It's OK for basement windows to be under a deck or porch. But there must be enough clearance for an average-sized adult to get out.

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 removed from the inside without keys or tools.

It’s also essential that basement windows can fully open. The window sash shouldn’t interfere with the opening. This enables your family to quickly exit—or first responders to quickly enter.

Local requirements for basement windows may vary. Check with Lafayette 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

Casement windows are a good option for not a lot of wall space. These windows operate like a door, swinging free to provide an ample opening.

Casement windows open by using a handle. Pella® casement windows incorporate a crank that folds away. That way, the crank won't disrupt window treatments.

This window must have at least 8 square feet of net opening.

Sliding Windows

Sliding windows are great for adding more light to large basements. These windows have to be larger, because the opening is only half as wide as the window. This is due to the sash, which slides horizontally.

Sliding windows open by moving the sash from left to right. Some Pella models feature 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 Lafayette

Basement escape windows are a necessity for downstairs living spaces. They can be lifesaving equipment in an emergency. Include our professionals at Pella of Lafayette. We can help when you're redoing your basement.

We can also recommend the right window that matches your project, budget and local egress requirements.

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