Egress Window
An egress window is a minimum-sized opening in sleeping rooms providing emergency escape and rescue access, required by building codes for occupant safety.
Egress windows provide emergency escape routes from bedrooms in case of fire or other emergencies. The International Residential Code (IRC) requires every sleeping room to have an egress window or door. Windows must meet minimum sizes: 5.7 square feet of opening area, 20 inches minimum width, 24 inches minimum height, and 44 inches maximum sill height from floor. Basement bedrooms need egress windows, often requiring window wells with dimensions allowing easy escape.
Why They Matter in Denver Basements
Finishing Denver basements to include bedrooms requires egress windows—this often becomes the most expensive part of basement finishing. Installation involves cutting through foundation walls, installing larger windows, and excavating window wells with code-compliant ladders or steps. Costs range from $3,000-6,000 per egress window. Bedrooms without egress windows must be called 'dens' or 'studies' on permits and real estate listings. Egress windows also bring natural light into basements, making finished spaces more livable.
Egress Window Requirements
- Minimum opening: 5.7 square feet (not including frame)
- Minimum dimensions: 20 inches wide, 24 inches high
- Maximum sill height: 44 inches from floor
- Window wells: 9 square feet minimum area, 36 inches minimum projection
- Window well ladders: Required if well depth exceeds 44 inches
- Opening operation: Must open fully without tools or keys
Related Terms
IRC Code (International Residential Code)
The International Residential Code (IRC) is a comprehensive building code covering all aspects of residential construction for one and two-family dwellings, adopted by most U.S. jurisdictions.
Building Permit
A building permit is official authorization from the local building department allowing specific construction work to proceed in compliance with building codes and zoning regulations.
Fire Separation
Fire separation consists of fire-rated wall, floor, and ceiling assemblies designed to contain fire spread between dwelling units, garages, or other separated spaces.