Section 30(6)(b) in Punjab Urban Planning and Development Building Rules, 2018
(b)The minimum height of basement shall be 2.40 meters measured from the finished level of the floor to the under surface of the beam, joist girders or any other horizontal structural member. However, if basement is used for habitable purpose than the minimum height and space requirement of that area shall be as per sub-rule (2) of rule 30 of these rules;