Basement Egress Window Requirements in Cache Valley

Posted by Cache Valley Basement Finishing

If you plan to add a bedroom to your basement, you've probably heard the term "egress window." This isn't a design suggestion; it's a non-negotiable, life-saving building code requirement. In Cache Valley—from Logan and Smithfield to Hyrum and Nibley—any "habitable space" in a basement must have a direct means of escape in case of a fire. For professional basement finishers, ensuring a project is 100% safe and code-compliant is a top priority. Here's a look at the specific requirements for egress windows in the area, which are based on the International Residential Code (IRC).

What is an Egress Window?

An egress window is a window large enough to serve as an emergency exit. The IRC, which Utah and its municipalities follow, states that every basement bedroom (or any "sleeping room") must have at least one egress window or an exterior door. A large, open finished basement may also be required to have one for the entire space, even without a designated bedroom.

The 4 Key Code Requirements

Failing an inspection on an egress window is a costly and difficult setback. The code is very specific, and all four of these requirements must be met.

1. Minimum Opening Size

The window must have a minimum "net clear opening" of 5.7 square feet. This is the actual open space you can climb through when the window is fully open. (Note: For ground-floor windows, this is 5.0 sq ft, but for basements, 5.7 sq ft is the standard.)

2. Minimum Opening Dimensions

The size alone isn't enough; the shape matters. The opening must be at least 24 inches high and 20 inches wide. It's important to remember that a 20" x 24" window does *not* meet the 5.7 sq ft requirement. You must meet all three: 5.7 sq ft of total space, a minimum height of 24", and a minimum width of 20". This often means the window must be significantly larger than these minimums (e.g., a 3' wide by 2.3' high window).

3. Maximum Sill Height

The bottom of the window opening (the sill) can be no more than 44 inches from the finished floor. This ensures an average person, including a child, can reasonably climb out.

4. The Window Well

Since the window is below ground, it must have a window well outside. This well also has strict requirements:

• Minimum Projection: The well must project at least 36 inches out from the foundation wall.
• Minimum Area: It must have a minimum surface area of 9 square feet (e.g., 3' wide by 3' deep).
• Ladder: If the window well is deeper than 44 inches, it MUST have a permanently affixed ladder or steps to allow for escape. The ladder must not encroach into the minimum well dimensions.
• Drainage: The well must have proper drainage installed to prevent it from filling with water or snow and flooding the basement.

Don't Risk It—Work With a Pro

Cutting a large hole in a foundation is not a DIY project. It requires a concrete saw, proper framing (a "buck"), and careful sealing to prevent leaks. More importantly, understanding and implementing the code is complex. Professional installers have installed countless egress windows and understand how to ensure every one will pass inspection the first time.

If you're planning a basement bedroom, start with a consultation. A professional will assess your foundation, explain the process, and include a safe, compliant egress window as a core part of your project. Don't compromise on your family's safety.