Section 81(3) in Kolkata Municipal Corporation Building Rules, 2009
(3)The width of such internal roads shall not be less than 4.0 m. Where internal road of 4.0 m. of width is not possible to be. provided due to an existing building constructed prior to the commencement of these rules, a building of not more than 7 m. in height may be allowed, provided that the width of the internal road shall not be less than 1.20 m.
