For many casement windows you ll need to order egress hardware which allows the window to not only swing open but also swing away.
Egress window dimensions uk.
The minimum egress window opening is 20 wide.
In addition the egress window requirements for basements specifies that they be at least 36 inches in height and width with a fully functioning opening.
Irc codes for egress.
All dwellings and extensions shall have first floor windows suitable for means of escape.
It must be at least 5 7 square feet that is at least 20 inches wide by 24 inches high with an opening no higher than 44 inches from the floor.
See below for the general criteria for egress windows.
Does not apply in all jurisdictions.
Casement windows are minimally 2 4 wide by 3 4 high.
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 international residential code irc requires a minimum opening of 5 7 square feet for egress windows.
Note that a window opening that s the bare minimum of 24 in.
Clear opening width 20 clear opening height 24 minimum clear opening sq ft 5 7 sq ft.
20 20 5 21 21 5 22 22 5 23 23 5 24 24 5 25 25 5 26 26 5 27 27 5.
Only one window per room is generally required.
A window has to be taller and or wider than these minimums to meet the 5 7 sq ft opening requirement.
The egress window must have a glass area of not less than 8 of the total floor area of room s for which it is servicing to allow the minimum amount of sufficient natural light.
If you have a window with an open height of 34 then the minimum open width would have to be 24.
Wide does not meet egress requirements since its net clear opening is only 3 33 sq.
2nd floor and above.
Cill height the bottom of the openable area should be no more than 1100mm above the floor area.
Height and width requirements in inches to meet the 5 0 sq.
The square footage must be configured with a minimum height of 24 inches and minimum width of 20 inches.
Also remember that the sill can t be more than 44 above the floor so you may end up with a taller window for a head height over 6 8.
High and 20 in.
Clear opening width 20.
Clear openable area no less than 0 33m.
This would mean that a window width of 20 inches would require a height of 41 inches.
Maximum sill height above the floor 44 1st floor.
Width and height either of these are not to be any less than 450mm.
Means of escape requirements.
To meet egress a window must comply with all four irc requirements.
Emergency egress windows means of escape from dwellings.
Permanent ladder or steps cannot encroach the required window well dimensions by more than 6 inches.
The minimum opening area of the egress window is 5 7 square feet.
