Construction Supervisor License Practice Exam

What is the maximum riser height allowed for stairs in most buildings?

1. 4 inches

2. 7 inches

3. 8 inches

4. 10 inches

The correct answer is: 7 inches

In most building codes, the maximum riser height for stairs is typically set at 7 inches. This standard is based on safety and usability considerations, as a lower riser height makes stairs easier to ascend and descend, reducing the risk of trips and falls. The 7-inch height is a compromise that accommodates a range of users, including children and the elderly, ensuring accessibility and comfort. Higher risers, such as 8 inches or 10 inches, can significantly increase the difficulty of traversing stairs, hence they are generally not permitted in standard construction to maintain safety standards. A riser of only 4 inches would be considered unconventional for typical stair scenarios, as it would create a more gradual slope, potentially leading to other safety issues such as inadequate support for the step. Therefore, the preferred maximum riser height of 7 inches strikes a balance essential for both safety and functionality in stair design.