A competent person (inspections) must not give a building certifier an aspect inspection certificate for an aspect of assessable building work for a single detached class 1a building unless—
(a) if the certificate is for the boundary clearances aspect of the building—the competent person is a cadastral surveyor; or
(b) if the certificate is for the reinforcement of footing system aspect of the building—the competent person is a registered professional engineer.