law: The Delhi Municipal Corporation Act, 1957
  361. Latrines and urinals, etc., in new buildings.-
  (1) It shall not be lawful to erect any building or execute any work on or in relation to such building without providing such latrine accommodation and urinal accommodation and accommodation for bathing or for washing clothes and utensils on each floor of such building as the Commissioner may prescribe.
  (2) In prescribing any such accommodation the Commissioner may determine in each case-
  (a) whether such building shall be served by the service system or by the flush system or partly by the one and partly by the other;
  (b) what shall be the site or position of each latrine, urinal, bathing or washing place or site and their number of each floor and their clear internal dimensions.
  (3) It shall not be lawful to erect a residential building composed of separate tenements on the flat system without providing at least one latrine and one bathing or washing place for servants on the ground floor of such building or at any other suitable place in the same premises.
  (4) In this section the expression "to erect a building" has the same meaning as in section 331.