![]() 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 than 31-1/2 inches (787 mm) where a handrail is installed on one side and 27 inches (698 mm) where handrails are provided on both sides.Įxception: The width of spiral stairways shall be in accordance with Section R311.7.10.1. 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. ![]() Stairs that only provide access to plumbing, mechanical, or electrical equipment. This shall include exterior stairs from a dwelling or garage to grade and those stairs serving decks, porches, balconies, sun rooms, and similar structures.ġ. The IRC and the California Code call for a minimum height of 34 inches for the handrail and a maximum height of 38 inches. The greatest riser height within any flight of. All stairways serving a dwelling or accessory structure, or any part thereof, shall comply with this section. The rise of steps and stairs must not be less than four inches nor more than eight inches. ![]() R311.7.1.1 Stairways serving dwellings or accessory structures. Section R311.7.1 is deleted and replaced with the following:
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