An egress window is a bedroom or sleeping room window meeting IRC Section R310 minimum opening requirements for emergency escape: minimum 5.7 square feet net clear opening (5.0 sq ft at grade level), 24-inch minimum clear opening height, 20-inch minimum clear opening width, and 44-inch maximum finished floor to sill height. Most standard basement horizontal slider windows are too small to qualify. Egress windows are required for every basement bedroom, any room used as a sleeping area in the basement, and every sleeping room in a legal basement ADU. Installation in an existing Utah basement requires: foundation wall cutting, window well excavation with drainage connected to the foundation’s perimeter drain, egress-size window installation (typically casement or single-hung, 36–44 inches wide), window well cover, and interior finish around the opening — all permitted and inspected. RainFire Builders manages the complete scope, including the foundation cut, which most window contractors don’t perform.