(1) No person shall undertake any building or sewerage work in respect of which plans have been approved by the local authority otherwise in accordance with-

a) the approved plans; and

b) any directions, orders, measures, precautions or other requirements lawfully made, given, approved or undertaken in terms of these by-laws; and

c) the provisions of these by-laws

(2) No person shall carry out any work in respect of which an undertaking of supervision has been given in a certificate referred to in paragraph (e) of subsection (1) of section 6 without the carrying out of such work being supervised in accordance with such undertaking.