Section 52(5) in Tamil Nadu Combined Development and Building Rules, 2019
(5)Habitable rooms. - (a) Height. The height of all rooms for human habitation shall not be less than 2.75m measured from the surface of the floor to the lowest point of the ceiling bottom of slab. In the case of pitched roof, the average height of rooms shall not be less than 2.75m. The minimum clear head room under a beam, folded plates or eaves shall be 2.4m. In the case of air conditioned rooms, a height of not less than 2.5m measured from the surface of the floor to the lowest point of air conditioning duct or the false ceiling shall be provided.(b)Size. - The area of habitable room shall not be less than 7.5sq.m with a minimum width of 2.4m. Pooja room, or store room shall not be taken as a habitable room]
