Section 30(15)(h) in Punjab Urban Planning and Development Building Rules, 2018
(h)All other occupancies : 1500 mm(ii)Minimum tread. - The minimum width of tread without nosing shall be 300 mm. However, for one or two family dwelling, it may be reduced to not less than 250 mm.(iii)Maximum riser. - The maximum height of riser shall be 150 mm. However, for one or two family dwelling, it may be increased maximum upto190 mm. The number of risers shall be limited to 12 per flight.(iv)Headroom height. - The minimum head-room in a passage under the landing of a staircase shall be 2.2 m. The minimum clear head-room in any staircase shall be 2.2 m.