What is the minimum height for a stair riser?

The minimum height for a stair riser being four inches aligns with safety and building code requirements that ensure stairs are usable and safe for individuals. A riser height of less than four inches could lead to an inadequate step that may be difficult or uncomfortable to use, particularly for those with mobility challenges.

Establishing a minimum height helps maintain consistency across staircases, which is essential for preventing accidents. It ensures that users can reasonably lift their feet and navigate the stairs without tripping or losing balance. Moreover, codes are designed to promote accessibility and usability, making the specified height a critical factor in stair design.

When the riser height is set at a standard minimum, it enables builders and inspectors to create safer, more functional residential and commercial stairways, ultimately benefiting all users.