Section 19(1): amended, on 14 April 2005, by section 16(2)(b) of the Building Amendment Act 2005 (2005 No 31).
Section 19(1)(b): replaced, on 28 November 2013, by section 8 of the Building Amendment Act 2013 (2013 No 100).
Section 19(1)(ba): inserted, on 28 November 2013, by section 8 of the Building Amendment Act 2013 (2013 No 100).
Section 19(1)(ca): inserted, on 1 February 2010, by section 8(1) of the Building Amendment Act 2009 (2009 No 25).
Section 19(1)(d): amended, on 1 February 2010, by section 8(2) of the Building Amendment Act 2009 (2009 No 25).