What is the maximum allowable rise in millimeters for a stair in a dwelling unit?

The maximum allowable rise for a stair in a dwelling unit is specified as 200 mm. This regulation ensures that stair treads and risers are built to a consistent size, promoting safety and accessibility for users. When the rise is limited to this measurement, it reduces the risk of tripping or misstepping, which is particularly important in residential environments where occupants may include children, seniors, or individuals with mobility challenges.

The code aims to strike a balance between the comfort of stair use and the constraints of building design, encouraging builders to follow best practices and maintain code compliance. Adhering to a rise of 200 mm allows for proper ergonomic design in staircases, optimizing user experience while also satisfying legal requirements stipulated for residential construction.