Section 326(1) in The Mumbai Municipal Corporation Act, 1888
(1)No person who proposes to build, take down or rebuild any building or wall, or to alter or repair any part of any building or wall, shall, in any case in which the footway in any adjacent street will be thereby obstructed or rendered less convenient, commence doing so, without first having caused to be put up a proper and sufficient hoard or fence, with a convenient platform and handrail, if there be room enough for the same and the Commissioner shall think the same desirable, to serve as a footway for passengers outside of such hoard or fence.