Height Of Window From Floor Regulations

Minimum net clear opening.

Height of window from floor regulations.

2018 irc section r311 3 1 restricts threshold height a required exit door in residences to 1 inches from the top of the the threshold to the floor or landing on each side of the door. For windows where the fall height from floor to ground is 4 m or greater there shall be no window openings greater than 125 mm within 865 mm of the floor. Minimum height of opening. For ground floor maximum sill height above floor.

Also note that if a window is being used to meet the egress requirements in addition to the above the sill height of the window shall not be more than 44 inches above the finished floor. If an escape window is required then criteria set out below should be followed. See below for the general criteria for egress windows. It is probably worth going over the existing requirements again.

These regulations are new so if you have an older house make sure you keep it up to code for your own safety. When a door is being used to meet the egress requirements it must be either a side hinged door or a slider. To avoid any confusion the window opening cannot be 450mm x 450mm so a width of 450mm and a height of 750mm will give you 0 33 m2 as required by the regulations but as all our windows are custom designed to your needs the dimensions can be customised to suit your window openings. Any other exterior door has a threshold height limited to 7 inches.