Section 162(2) in West Bengal Municipal (Building) Rules, 2007
(2)(a)The following appurtenant structures shall not be included in the height of the building :(i)stair cover not exceeding 2.40 metres in height;(ii)lift machine rooms as per the latest edition of the National Building Code;(iii)roof tanks and their supports, the height of support not exceeding 1.00 metres;(iv)chimneys;(v)parapet walls not exceeding 1.50 metres in height;(vi)ventilating, air-conditioning and other service equipment;(vii)height above mid-point between eaves level and ridge level;(b)The aggregate area of the structures mentioned in clause (a) shall not exceed one-third of the area of the roof upon which these are erected.
