Section 29(d): amended, on 1 July 1992, by section 92(1) of the Building Act 1991 (1991 No 150).
Section 29(e): repealed, on 1 July 1992, by section 92(1) of the Building Act 1991 (1991 No 150).
Section 29(ka): inserted, on 20 October 1978, by section 2 of the Health Amendment Act 1978 (1978 No 96).
Section 29(ka): amended, on 23 July 1993, by section 2 of the Health Amendment Act (No 3) 1993 (1993 No 71).
Section 29(m): amended, on 1 January 1983, by section 27(a) of the Clean Air Amendment Act 1982 (1982 No 31).
Section 29(m): amended, on 1 January 1983, by section 27(b) of the Clean Air Amendment Act 1982 (1982 No 31).