Ontario Building Code Practice Exam

What is the minimum clearance required for a door in a commercial building?

1. 750 mm

2. 800 mm

3. 850 mm

4. 900 mm

The correct answer is: 900 mm

The other options, 750 mm, 800 mm, and 850 mm, are all common door clearance sizes for residential buildings. However, for commercial buildings, it is required to have a minimum clearance of 900 mm in order to accommodate wheelchair users and other mobility aids. Going any lower than 900 mm would not meet accessibility standards and could hinder the access and safety of individuals with disabilities. Therefore, option D, 900 mm, is the correct answer for a commercial building.