7. Any stairway replacing an existing stairway within a space where the pitch or slope cannot be reduced because of existing construction shall not be required to comply with the maximum riser height and minimum tread depth requirements. 1011.5.4 Dimensional uniformity. Stair treads and risers shall be of uniform size and shape.. "/>

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Ibc stair handrail requirements

2018 International Building Code (IBC) - CHAPTER 10 MEANS OF EGRESS - 1014.2 Height. 1014.2Height. Handrail height, measured above stair tread nosings, or finish surface of ramp slope, shall be uniform, not less than 34 inches (864 mm) and not more than 38 inches (965 mm)..

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They must be no less than 1 1/2″ from the wall. Circular rails must have a grip size between 1 1/4″ - 2″. Other shapes must have a circumference between 4″ - 6 1/4″. The cross section can not exceed 2 1/4″. Edges must have a minimum radius of .01″. Rails with a circumference greater than 6 1/4″ must a graspable finger hold. Web. At the top of a stair flight, handrails shall extend horizontally above the landing for 12 inches (305 mm) minimum beginning directly above the first riser nosing. Extensions shall return to a wall, guard, or the landing surface, or shall be continuous to the handrail of an adjacent stair flight. Figure 505.10.2 Top Handrail Extension at Stairs.

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For stair rail systems installed on or after January 17, 2017, the top rail and handrail must be separate. The top rail must be at least 42 inches in height (§1910.29 (f) (1) (ii) (B)) and the handrail must be 30 to 38 inches in height (§1910.29 (f) (1) (i)) (as measured at the leading edge of the stair tread to the top surface of the rail).
According to the IBC, stairways with an occupant load of fewer than 50 people must be at least 36 inches wide. Stairs that are higher than 12 feet tall require an intermediate landing in the middle of the stairway. These landings should be the same width as the stairway and extend at least three feet in length.
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