Section 2(5) in New Town Kolkata Planning Area (Building) Rules, 2014
(5)"alteration" means change from one occupancy to another, or a structural change, such as an addition to the area or height, or the removal of part of a building, or any change to the structure, such as, the construction of or cutting into or removal of any wall, partition, column, beam, joist, floor or other support, or the change to or closing of any required means of ingress or egress, or the change to the fixture or equipment;
