Section 3(2)(a) in Kolkata Municipal Corporation Building Rules, 2009
(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 of the site and not overhanging a street, however, that the total height of the parapet wall shall not be more than 1.50 m. and width of the cornice or chajja shall not be more than 60 cm.;