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And 270 mm from each side of the unobstructed width of the stairway if the stairway is 1 m wide or more. For example the standard rise over run for stairs covering 9 feet is a 7-inch rise and 11-inch run. Residential Stair Codes Explained Building Code For Stairs The number of risers not the number of treads is used to determine the number of steps that comprise a staircase. Standard stair rise . Total Run G - The Total Run is the horizontal length of. The Total Rise should be not larger than 151 inches 3835 mm between landings or floor levels. 270 mm in from the outer side of the unobstructed width of the stairway if the stairway is less than 1 m wide applicable to a non-required stairway only. The general rule for standard stair dimensions that is accepted by many general contractors and stair designers is known as the 7-11 rule. Tread inches 2x Riser inches 24-25 26 for exterior stairs Riser inches x Tread inches 72-75. Stairs have uniform riser heights and tread depths...