These dimensions are a revision of earlier, briefly adopted standards that allowed a maximum of 7 inches on risers and a minimum of 11 inches for tread depths-sizing promoted by some safety experts following a 1985 study of accidents on stairs in the workplace. Even if 7 3/4-inch risers and 10-inch treads are allowed in your area, we suggest opting for shorter heights and deeper treads for the sake of comfort and safety. Get your local stair-building requirements from your city or county building department.Īs a general rule of thumb, the International Code Council, administered by the Building Officials and Code Administration (BOCA), may allow maximum riser height of 7 3/4 inches and a minimum tread depth of 9 inches plus a 1-inch nosing where solid risers are utilized. Some local codes have different restrictions than accepted standards because of local conditions such as danger of flooding or earthquake. Though many local codes are based on certain national standards, there is no single national code that regulates stairs in all areas. You must be sure that any stair you plan, build, or buy will meet your local codes. Stairs are built according to basic rules and principles intended to make them safe to use. Because the location of railings and balusters, width and depth of tread, and height of risers affect the ease and safety of using a stair, these dimensions are regulated by building codes.
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