What Is an Egress Window and When Is It Required?

Understanding safety requirements for bedrooms and basements 

An egress window is a window designed to provide a safe emergency exit in case of fire or other emergencies. In many cases, egress windows are required by building code, particularly in bedrooms and finished basements. 

Understanding when an egress window is required — and what windows qualify — can help homeowners avoid compliance issues and improve home safety. 

What makes a window an “egress” window? 

To qualify as an egress window, the window must meet minimum size and accessibility requirements set by building codes. While exact requirements can vary by jurisdiction, egress windows generally must meet minimum standards for: 

• Clear opening width 

• Clear opening height 

• Total net clear opening area 

• Maximum sill height from the floor 

These requirements ensure that an adult can safely exit the window and that emergency responders can enter if needed. 

Where are egress windows required? 

Egress windows are commonly required in: 

• Bedrooms 

• Basements with habitable living space 

• Basement bedrooms 

If a basement is finished or used as a sleeping area, at least one egress window (or egress door) is typically required. 

Why egress windows matter 

Egress windows are a critical life-safety feature. They: 

• Provide an escape route during emergencies 

• Improve natural light and ventilation 

• Increase usable and compliant living space 

• Can positively impact resale value 

Homes without required egress openings may face issues during inspections or future sales. 

Installing or upgrading egress windows 

Installing an egress window often involves more than swapping out glass. It may require: 

• Enlarging an existing opening 

• Structural framing changes 

• Window well installation (for below-grade windows) 

Because of these factors, permits are usually required, and professional installation is strongly recommended. 

Wenatchee Valley Glass works with homeowners throughout Chelan County to determine when egress windows are required and to install compliant, code-ready solutions.