Section 67(3) in Assam Notified Urban Areas (Other than Guwahati) Building Rules, 2014
(3)Additional rear and side setback for a building when height is above 11.5 m shall be as follows:-(a)if the height is from 11.5 m up to 15 m., the rear setback shall be 3 m and side setback shall be 1.5 m;(b)side and rear setback should be increased by 0.3 m for every 1.5 m of additional height of the building in addition to the set backs already prescribed for a building of 15 m height up to a maximum of 1.5 m of additional set backs on both rear and sides.
