law: 252. Prohibition of structures or fixtures which cause obstruction in streets.
  (1) No person shall, except with the permission of the Chief Executive Officer, erect or set up any wall, fence, nail, post, step, booth or other structure whether fixed or movable or whether of a permanent or temporary nature, or any fixture in or upon any street so as to form an obstruction to, or an encroachment upon, or a projection over, or to occupy any portion of such street, channel, drain, well or tank.
  (2) The Chief Executive Officer may, by notice in writing, require the owner or occupier of any such building to alter or remove any such projection or encroachment as aforesaid:
  Provided that, in the case of any projection or encroachment lawfully in existence at the commencement of this Act, the Chief Executive Officer shall make compensation for any damage caused by the removal or alteration.
  (3) The Chief Executive Officer may, by order in writing, give permission to the owners or occupiers of buildings in any particular street to put up open verandahs, balconies or rooms projecting from any upper storey thereof to an extent beyond the line of the plinth or basement wall at such height from the level ground or street as may be specified in the order.