Section 11(2)(a) in West Bengal Municipal (Building) Rules, 2007
(a)erection, re-erection, addition to, or alteration of(i)an internal partition wall which does not violate any of the provisions of the Act or these rules, or(ii)a parapet wall or a cornice or chajja within the boundaries or the site are not overhanging a street, so, however, that the total height of the parapet wall shall not be more than 1.50 metres and width of the cornice or chajja shall not be more than 50 centimetres;