Section 52(7)(b) in Tamil Nadu Combined Development and Building Rules, 2019
(b)Size. - The area of a bath room shall not be less than 1.4sq.m. with a minimum width of 1.0m. The floor area of water closet shall be 1.0 sq.m. with a minimum width of 0.9m. If bath and water closet are combined, its floor area shall not be less than 2.4sq.m. with a minimum width of 1.2m.