Section 2(9) in Tamil Nadu Town and Country Planning Act, 1971
(9)"building operations" includes -(a)erection or re-erection of a building or any part of it;(b)roofing or re-roofing of a building or any part of a building or an open space;(c)any material alteration or enlargement of any building which involves alteration or enlargement, as the case may be, of more than one-tenth of the extent of the cubical contents of such building;(d)any material change in the use of a building including the conversion of the use of any part used for human habitation into a greater number of such parts;(e)any such alteration of a building as is likely to affect its drainage or sanitary arrangements or affect in material respects its structural stability; and(f)construction of a door opening on any street or land not belonging to the owner;
