How high should a stair handrail be and what size is actually graspable?
Handrails sit 34–38 in high, with round grips 1¼–2 in in diameter (IRC R311.7.8).
A handrail is required on at least one side of any flight with four or more risers, and its top must sit between 34 and 38 inches (864–965 mm) above the tread nosings.
For graspability, a round (Type I) handrail must have an outside diameter of 1¼ to 2 inches. A non-circular profile qualifies with a perimeter of 4 to 6¼ inches and a maximum cross-section of 2¼ inches. Larger (Type II) handrails are allowed only when they include a graspable finger recess.
Verified against
Related answers
- What height should a stair handrail be? — IRC §R311.7.8.1
- What are the maximum stair riser height and minimum tread depth? — IRC §R311.7.5
- How wide does a staircase have to be? — IRC §R311.7.1
- How tall do guardrails and deck railings need to be? — IRC §R312.1.2
- At what height does a deck, porch, or stair need a guard? — IRC §R312.1.1
- How far apart can balusters be on a railing? — IRC §R312.1.3
- How much force does a deck guardrail or handrail have to resist? — IRC §R301.5
- How high does a window sill have to be above the floor to meet fall-protection rules? — IRC §R312.2.1
Need this scoped to your jurisdiction?
Adopted edition and local amendments vary by city and county. Ask Donnie checks your jurisdiction and cites the exact adopted section.
Ask Donnie →General information based on the International Residential Code (a model code). This is AI assistance to verify — not legal advice. Confirm the adopted edition and any local amendments with your local building department (AHJ) and a licensed professional before you build.