What is the minimum clear opening height above the handrail and below the head in a stairwell?

What is the minimum clear opening height above the handrail and below the head in a stairwell?

• A. 48 inches
• B. 36 inches
• C. 42 inches
• D. 34 inches

Answer: (B)

Vertical clearance around a stairwell handrail must be enough for people to pass without striking their head. The minimum opening height above the handrail and below the head is set at 36 inches to give a practical margin for safe passage—handrails are typically around 34 inches high, so this 36-inch gap provides comfortable headroom for most people, including those wearing hats or carrying items. Larger clearances, such as 42 or 48 inches, aren’t required and would waste space, while a 34-inch gap would be too tight for safe passage.

Vertical clearance around a stairwell handrail must be enough for people to pass without striking their head. The minimum opening height above the handrail and below the head is set at 36 inches to give a practical margin for safe passage—handrails are typically around 34 inches high, so this 36-inch gap provides comfortable headroom for most people, including those wearing hats or carrying items. Larger clearances, such as 42 or 48 inches, aren’t required and would waste space, while a 34-inch gap would be too tight for safe passage.