Section 109 in Kolkata Municipal Corporation Building Rules, 2009
109. Bathroom and water closet.
(1)No bathroom shall have a floor area of less than 1.8 sq. m., a width less than 1.2 m. and height less than 2.1 m. measured from the surface of a floor to the lowest point of the ceiling or the underside of any slab:Provided that it is a combined bathroom and a water closet, such floor area shall not be less than 2.6 sq. m.(2)No water closet shall have a floor area of less than 1.2 sq. m. and a width less than 1.0 m.(3)Notwithstanding the provisions of sub-rule (1) or sub-rule (2), in the case of any building referred to in rule 84.(a)an independent bathroom shall have a floor area of 1.45 sq. m.,(b)a combined bathroom and water closet shall have a floor area of 2.4 sq.m., with a minimum width of 1.1m.(4)Every bathroom or water closet shall -(a)be so situated that at least one of its walls shall face an interior open space or exterior open space or shaft and shall have an opening in the form at a window or ventilator or louvre not less than 0.40 sq. m. in area,(b)not be directly over any room other than a latrine or water closet or washing place or a bathroom or a terrace unless it has a water tight floor,(c)have the platform of seat made of water tight non-absorbent materials,(d)be enclosed by walls or partitions and the surface of every such wall or partition shall be finished with a smooth impervious material to a height of not less than 1 m. above the floor of such a room.(e)be provided with a door completely closing the entrance to it, and(f)be provided with an impervious floor sloping towards any drain with a suitable gradient.(5)No room containing any water closet shall be used for any purpose except as a lavatory and no such room shall open directly into any kitchen or cooking space or pantry by a door, window or other opening,(6)In a building constructed under the provisions of Chapter XIII of these rules, the sizes of bathrooms and water closet shall conform to the following-(i)the area of an independent water closet or independent bathroom shall not be less than 1.00 sq. m. with a minimum width of 0.9m.(ii)the area of a combined bathroom with water closet shall not be less than 1.50 sq. m. with a minimum width of 1.00 m.
