What is an Emergency Escape and Rescue Opening (Egress) Window?

Emergency Escape and Rescue Openings (EEROs) are required to provide an emergency escape/rescue and can come as different types of windows or doors, but must have a large enough opening to pass through. Learn more about EERO windows and their requirements. Sometimes people may refer to these as "egress windows" or "egress openings."

Emergency Escape and Rescue (EERO) Window Definition

Emergency Escape and Rescue Opening is defined by the International Residential Code (IRC) as an operable exterior window, door, or similar device that provides for a means of escape and access for rescue in the event of an emergency. Homes need EERO windows in certain locations in a home for emergency exits. Bedrooms, basements with one or more sleeping room, habitable attics, and living spaces require EERO windows to provide an escape in the event of a fire or other emergency that blocks other exits. EERO windows must meet specific dimensions.

Egress Window Size Requirements

The IRC states EERO windows need:

• A minimum net clear opening width of 20 inches.

• A minimum net clear opening height of 24 inches.

• A minimum net clear opening of 5.7 square feet. There are exceptions to the 5.7 square feet requirement in codes:

  • There is an exception to the minimum net clear opening for grade-floor emergency escape and rescue openings, which is 5 square feet.

  • There is an additional exception to this when replacing emergency escape and rescue windows when it involves a change of occupancy, which is 4 square feet. Always check with your local building inspector or city building codes to ensure compliance.

• A sill or bottom of the clear opening not more than 44 inches above the floor.

• To open without the use of keys, tools, or special knowledge.

Some states and municipalities might have their own EERO or egress window code that differ from IRC guidelines. Check with your local building inspector or city building code to learn the requirements for your home.

What’s the Difference between an ERRO Window and a Regular Window?

There is no difference between an EERO window and a regular window based upon the materials, glass, and finish used. They may look similar, however, an EERO window must meet size requirements.

Types of Egress Windows

EERO windows can come as regular window types. Slider, casement, double hung, and single hung windows commonly get used as egress windows, provided they meet dimension specifications. If you’re renovating a home, you may need to install larger windows to meet EERO requirements. Note: egress and building code requirements vary by municipality. It’s best to consult with your local building official for accurate requirements.

Choosing Egress Windows

Marvin Replacement offers stylish casement, single hung and double hung, and horizontal slider windows in sizes that meet EERO window requirements. Casement windows open wide to provide a large enough opening space for egress guidelines. Marvin Replacement Casement Windows can come with a Clear View® hinge, which resides at the edge of the frame to provide an uninterrupted view and bigger net clear opening area.

Marvin Replacement can size slider windows to meet EERO requirements with a variety of configurations for unique looks and functionality. Our slider windows can come in equal or unequal sash size configurations as well as triple sash assemblies. Our slider window handles remain away from the viewing area to maximize your available net clear opening and daylight.

Egress Window Benefits

Installing a casement, double hung, single hung, or slider window as an EERO window can bring additional benefits to the room. A casement, double hung, single hung, or slider window used for EERO brings more natural light to a room and additional ventilation. Since casements, double hung, single hung, and slider windows open wide you can take full advantage of sunny days and cool breezes. Or you can open each just enough to cool a room down while you relax.

Ready to Replace Your Windows?

Learn more about our casement and slider window options and configurations to find the right window for any room in your home with Marvin Replacement. Schedule a free, no-pressure design consultation today with a Marvin Replacement design consultant for an up-close view of what you can expect with our durable Ultrex® fiberglass windows.