The building codes as they relate to windows have changed multiple times over the years. In older homes, windows are often too high from the ground and the actual window openings are too small to meet code for the exit and rescue opening size.
People often hope their home is “grand-fathered in” because it was built to code “way back when”. On codes that are considered “life/safety” such as this issue, there is no grand-father clause. This is because as recently as January 2009, Anchorage realized a fire death was substantially attributed to by the lack of adequate emergency escape and rescue windows. This is why windows often have to be upgraded in older homes in order to sell them.
Currently the window code says that “Every sleeping room must have at least one open-able window to permit emergency exit and rescue. The sill height has to be not more than 44 inches above the floor and provide not less than 5.7 sq. ft. of open-able area with dimensions no less than 20 inches.”
Ground level openings are permitted to have a minimum net clear opening of 5 sq. ft. This is because if the firemen don’t have to utilize a ladder to get in the window, as they do on upper levels, they don’t need as much open-able space.
There are a couple of exceptions in the rule; If the windows were installed prior to 2004, the maximum allowable sill height cannot exceed 48 inches above the floor.
Windows located in buildings constructed prior to 1979 need to have at least five sq. ft. of open-able area. The minimum net clear opening width shall be 20 inches and the minimum net clear opening height shall be 22 inches
A single permanent step may be constructed in front of an existing emergency escape and rescue windows serving a basement or sleeping room shall meet the maximum allowable sill height specified above. The distance between the top of the step and the window sill shall not exceed 44 inches.
It can be frustrating for people who have lived in their homes for a long time without any window issues to have to remove a window and install new ones. It’s even more of a problem if you have to open the wall to lower the sill height.
You can get more detail on this, or any Anchorage building code, by going online to the Municipal website at www.Muni.org.








