What’s an “egress window”? An easy-to-open window that serves as an emergency exit for below-ground living space of any kind.
Let’s be honest – during a fire, stairs could be blocked or damaged. To avoid such dangerous situations, the International Residential Code requires a safe means of egress in all basements used partially or entirely as a living space.
Just as important, these windows totally eliminate the "dungeon feeling" that many, if not most, basements have. Even finished basements can have stale air and primarily artificial lighting.
With egress windows, you can have fresh air in your basement to improve your home’s overall ventilation, as well as increased natural light to brighten the space and make it much more pleasant.