Section 33(3) in Faridabad Complex Administration Building Rules, 1989
(3)No staircase, in a residential building shall have riser of more than 20 centimetres and a tread of less than 22.5 centimetres. No staircase in a commercial, public or industrial building shall have a riser of more than 18 centimetres and a tread of less than 27 centimetres. Notwithstanding anything contained in sub-rule (2), the staircases in the private portion of a public building and industrial building not open to the general public may be of the sizes mentioned for residential building.
