law: 239. Applications for additions to, or repairs of, buildings.
  (1) Every person who intends to execute any of the following works, that is to say,
  (a) to make any addition to a building;
  (b) to make any alteration or repairs to a building involving the removal or re-erection of any external or partly wall thereof or of any wall which supports the roof thereof to an extent exceedingone-half of such wall above the plinth level, such half to be measured in superficial metres;
  (c) to make any alteration or repairs to a frame building involving the removal or re-erection of more than one-half of the columns or posts in any such wall thereof as aforesaid; or involving the removal or re-erection of any such wall thereof as aforesaid to an extent exceeding one-half of such wall above plinth level, such half to be measured in superficial metres;
  (d) to make any alteration in a building involving
  (i) the sub-division of any room in such building so as to convert the same into two or more separate rooms; or
  (ii) the conversion of any passage or space in such building into a room or rooms;
  (e) to repair, remove, construct, reconstruct or make any addition to or structural alteration in any portion of a building abutting on a street which stands within the regular line of such street;
  (f) to close permanently any door or window in an external wall;
  (g) to remove or reconstruct the principal staircase or to alter its position;
  shall apply for sanction by giving notice in writing of his intention to the Chairperson in such form and containing such information as may be prescribed by bye-laws made in this behalf.
  (2) Every such notice shall be accompanied by such documents and plans as may be so prescribed.