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Generally, residential stairs are to be a minimum width of 36" with a maximum rise of 7 ¾” and a minimum run of 10” with no more than a 3/8” difference between the smallest and greatest. Graspable, continuous handrail the full length of the flight of stairs with four or more risers shall be between 34” & 38” in height Guards are required if the platform surface is more than 30” from grade and shall not be less than 34” in height.  Vertical rails should not allow passage of a sphere 4” in diameter.      

 Stairs & Railing  Stairs & Railing 2


 For more information:
  Residential Stairs One & Two-Family Dwellings                                           

  2018 International Residential Code                   
  Commercial Stairs
  2018 International Building Code


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