Section 15(1)(ba): inserted, on 1 February 2010, by section 7(1) of the Building Amendment Act 2009 (2009 No 25).
Section 15(1)(c): replaced, on 1 February 2010, by section 7(2) of the Building Amendment Act 2009 (2009 No 25).
Section 15(1)(na): inserted, on 17 December 2019, by section 8 of the Building Amendment Act 2019 (2019 No 27).