Jeld-wen.com offers an egress window calculator to verify that a window’s size and material meets code specifications. Generally, egress windows must meet International Residential Code criteria.
The International Residential Code criteria require egress windows to have a minimum width of 20 inches and height of 24 inches. Egress windows are designed for emergency exiting from a house. Emergencies could include fires, robberies or any other threatening situation that would require immediate departure from building premises. Egress windows are required in bedrooms and any finished room or basement that could be used for sleeping. The height of the window from the ground must be no higher than 44 inches to ensure a person can easily climb out. Code also requires the window to be operable without a key or any tools.