If there are handrails on both sides, then the minimum width of the rails should be at least 27-inches below the handrails. The minimum stair width above the handrail and below the ceiling shouldn’t be less than 36 inches.īelow the handrail, the minimum width should be at least 31.5 inches if there is one handrail. Read Also: 7 Things That Fail A Home Inspection Basically, if there are no risers, then a child’s head shouldn’t be able to pass through above than 30″ point from the ground. If the stairs has open risers, then anywhere above 30″ from the floor should not permit a sphere of 4-inch diameter to pass through. There shouldn’t be a height difference of more than 3/8″ between the tallest and shortest riser.
Riser height should have a maximum height of 7-3/4 inch height (4-inch minimum). The longest tread versus the shortest tread shouldn’t be more than 3/8-inch. The treads (horizontal portions) of a stairs should be at minimum 10-inches long. Nevertheless, I have compiled the seven most important stair code requirements with some helpful pictures below: 1. Staircase code for residential homes can get pretty complex, and there are numerous exceptions within the IRC handbook as well as state code that can take priority.
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