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From the 2012 International Residential Code unless otherwise indicated.
Stairways shall not be less than 36 inches (914 mm) in clear width at all points above the permitted handrail height and below the required headroom height. Handrails shall not project more than 4.5 inches (114 mm) on either side of the stairway and the minimum clear width of the stairway at and below the handrail height, including treads and landings, shall not be less then 31.5 inches (787 mm) where a handrail is installed on one side and 27 inches (698 mm) where handrails are provided on both sides.
The minimum headroom in all parts of the stairway shall not be less than 6 feet, 8 inches (2032 mm), measured vertically from the sloped line adjoining the tread nosing or from the floor surface of the landing or platform on that portion of the stairway.
The maximum riser height shall be 7 3/4 inches (196 mm).
The minimum tread depth shall be 10 inches (254 mm).
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