Minimum Window Height Above Floor

Minimum 24 inches of net clear height opening.

Minimum window height above floor. The 2012 ibc international building code and the irc international residential code requires the bottom sill of operable windows to be a minimum height above the interior floor when they are 72 inches or more above the grade outside the window. According to the 2018 irc all windows that are more than 6 feet above the grade outside the window must have a bottom opening a minimum of 24 inches above the room s interior floor. R312 2 1 window sills in dwelling units where the opening of an operable window is located more than 72 inches 1829 mm above the finished grade or surface below the lowest part of the clear opening of the window shall be a minimum of 24 inches 610 mm above the fininshed floor of the room in which the window is located. The 24 inch sill height is typically above a small child s center of gravity reducing the likelihood of the child s toppling over the sill.

The code regulates this minimum sill height only. Set a window closer than 10 inches from the ceiling and odds are you ll have to raise the header up into the structure of the floor cavity or rafter space above called an upset header. Maximum 44 inches to window sill measured from finished floor. Exceptions can be made for windows that do not open more than 4 inches or that have window guards or opening control devices in compliance with astm f2090 17.

Window wells serving an egress window shall not be less than 9 square feet in area with a horizontal length width of no less than 36 inches. The minimum window sill height requirements are intended to reduce the number of injuries from falls by children through open windows. If you are installing windows within 2 feet of a door and lower than 5 feet from the ground you need tempered glass in the windows even though these might be higher than 18 inches from the ground. If the height of the door is 7 ft and the height of the window is 4 ft then the height of the window will be 7 ft 4 ft 3 ft.

It can be simply calculated by following calculations windows height from floor level height of door height of window. So the standard height of the door from floor level is 2 1 m or 7 ft. That type of construction costs extra especially in an existing home but the additional head height can make all the difference in a large room. Any windows in a door must have tempered glass no matter the height unless it is too small for a 3 inch ball to pass through the window.