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

The minimum clearance required for a door in a residential building is 850 mm. This is the standard clearance required for a door to be considered accessible for individuals with disabilities, who may use a wheelchair or mobility aid. Options A and B are too narrow, which would make it difficult for wheelchair users to enter and exit the room. Option D is wider than the standard clearance but may not be necessary and could potentially waste valuable space in the building. Therefore, option C is the most appropriate and practical choice for a minimum door clearance in a residential building.