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The maximum rise allowed for private stair treads is specified in the building code to ensure safety and accessibility. A rise of 200mm is the standard permissible limit for private stairs because it strikes a balance between usability and safety. Steeper rises can create difficulties when ascending or descending, particularly for those with mobility challenges.

With a maximum rise set at 200mm, the intention is to prevent fatigue and promote safer navigation of stairs, particularly in residential settings where frequent use is anticipated. This height is in alignment with practices that aim to ensure that the stairs are manageable for a wide range of individuals.

The other height options exceed this standard, presenting challenges that can impact the safety and comfort of users. Adhering to the 200mm limit helps avoid potential accidents related to steeper stair configurations.