What are the current residential Stair and Handrail requirements?

Residential stairways must be at least 36" wide with treads at 10" minimum depth and a maximum riser height of 7-3/4". Handrails are required on any stairway with 4 or more risers (steps). Handrails must be installed at a height between 34"-38" above the stair (measured @ the stair nosing).