How high is the 400 stairs?

The height is 150- 175 (the maximum height is 175).

The tread width of common residential stairs is 260-300 (minimum width is 260) and the height is 150- 175 (maximum height 175). When the stair direction changes, the minimum width of the platform at the turning end of the handrail should not be less than the stair width: the step width is 800mm ~ 1200mm.

The height of stair balustrade should be measured upward from the front of the steps according to the General Principles for Civil Building Design, so as to ensure the design height of the balustrade.