(1) All load-bearing structures not specifically provided for in these by-laws shall be designed by a structural engineer, who shall provide a certificate to the local authority in accordance with the provisions of paragraph (e) of subsection(1) of section 6 of Chapter 2.

(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 subsection(1) without the carrying out of such work being supervised in accordance with such an undertaking.