Ontario Building Code Practice Exam 2026 - Free Building Code Practice Questions and Study Guide

The minimum height required for a handrail on a stairway in a residential building is 850 mm. This ensures that the handrail is at a comfortable height for most adults to grip and can provide proper stability and support while using the stairs.

Option A (750 mm) is generally too low and may not provide enough support for people with varying heights. Option C (950 mm) and D (1050 mm) are both too high and may not be easy for shorter individuals and children to reach. It is important to have a handrail at an appropriate height to promote safety and accessibility for all individuals in a residential building.