City of Binghamton, New York

What are the Code requirements for new stairs?

A Building Permit is required for all new or reconstructed stairs and stairways. Refer to the NY State Residential Code for complete details (Residential Code R311.5)
In one or two-family, residential structures minimum stair tread is 9," the maximum riser height is 8 1/4", the minimum stair width is 36."  All risers and treads must have the same measurement.
Handrails are required for stairs that have more than two risers. Minimum height is 34" and the maximum height is 38" measured from the nosing of the stair tread. 
Handrails and deck guards shall not have any openings between spindles/barristers of 4." 

Building Construction