Section 2(b) in The West Bengal Slum Areas (Improvement And Clearance) Act, 1972
(b)"hut" means any structure, no substantial part of which, excluding the walls up to a height of fifty centimetres above the floor level, is constructed of masonry, reinforced concrete, ferroconcerte, cemented brick work, steel, iron or other metal or any combination thereof or prefabricated materials;
