Ontario Building Code Practice Exam

What is the minimum width required for a door in a residential building?

1. 700 mm

2. 750 mm

3. 800 mm

4. 850 mm

The correct answer is: 800 mm

The minimum width required for a door in a residential building is typically determined by building codes and regulations in the particular area. Generally, the minimum width is 800 mm (2 feet 7.5 inches). Option A, 700 mm, is too narrow and would not meet safety standards for door openings. Option B, 750 mm, is also too narrow and may not provide enough space for people to comfortably enter and exit the room. Option D, 850 mm, is wider than the minimum requirement and may be preferred for accessibility or larger furniture to fit through, but it is not the minimum width required. Therefore, the correct answer is option C, 800 mm.