2006 New York Code - Inspection.

 
    §  27-919  Inspection.  Every  new  plumbing and gas piping system and
  every part of an existing system  that  has  been  altered,  except  for
  ordinary  repairs, shall be inspected and tested to determine compliance
  with code requirements except that the commissioner may promulgate rules
  authorizing a certification from a master plumber for  minor  work  that
  was performed in accordance with applicable codes in lieu of the two day
  inspection  notification  requirement  of section 27-920 of this article
  and the inspection reporting requirements of subdivision  a  of  section
  27-922  of this article. In no event shall such certification be allowed
  for any new installation, or any alteration to an  existing  gas  piping
  system.