Why Are Egress Windows Required?
When bedrooms are added to basements without the requisite egress window, they create a dangerous underground firetrap. During remodeling, homeowners often unwittingly replace large egress windows with smaller, non-egress windows. And while the code will require egress windows be installed when bedrooms are added on, they won't necessarily dictate that windows in existing bedrooms be enlarged to egress size; it's simply too difficult to monitor every situation.
Required or not, egress windows are crucial lifesaving equipment. If a room has even the remote possibility of later becoming a bedroom, include an egress size window.