70. Duties of local authorities.

It is the duty of local authorities1 to carry the Building Act 1984 into execution in their areas, subject to2:


    (1)     the provisions of the Building Act 1984 relating to certain other authorities or persons3;


    (2)     the provisions of Part I of the Public Health Act 19364 relating to united districts and joint boards5;


    (3)     the provisions of the Local Government, Planning and Land Act 19806 relating to building control functions in urban development areas7; and


    (4)     the provisions of the Public Health (Control of Disease) Act 19848 relating to port health authorities and jurisdiction in any part of