Stairs Standard Size

• Headroom-6’8” min.
• Tread size-10” min.
• Rise-7 3/4” max.
• Railing height-34”-38”
• Railing gap-6” max.
• Nosing- 1/4”- 3/4”
• Step length-36” min
• Railing placement-4 1/2” max.
• Max. number of steps-12

(The size of tread and rise should be proportional, so that the sum of 2 rise and 1 tread, minus nosing, will be more than 24” and no more than 25”.)

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