Section 68(a) in Kolkata Municipal Corporation Building Rules, 2009
(a)Cornice, chajja or weather shade and all such features related to facade, treatment such as fins, flower boxes, pilasters, column capitals, arches, pediments, trellises, ducts for encasing pipe lines, pipe supports and all such features used to enhance the aesthetic quality of a building (not more than 60 cm) shall be allowed to overhang or project over open spaces Provided that such projections shall not be allowed at a height less than 2.5 m. over the ground level. Ducts for encasing pipe lines, pipe supports etc: will however be allowed from the ground level without creating obstruction to the movement of vehicles/fire tenders wherever applicable as per rule;
