The IRC stairs code states that, to comply with stairway requirements, the minimum width for residential stairs be no less than 36 inches. The stair riser code is up to 7.75 inches, and can not vary more than 3/8 of an inch. There are also section codes in place for standard stair tread dimensions.

What is code for commercial stairs?

Minimum 80 inches of headroom height clearance for stairway. Maximum 12 feet vertical height (rise) for a flight of stairs. Maximum 7 inch stair riser height and minimum 4 inch stair riser height.

What is the legal requirement for stairs in a house?

The following rules must be met: The individual rise must be between 150mm and 220mm. The individual going must be between 220mm and 300mm. The Pitch of the stair cannot be greater than 42 degrees.