21Certificates by particular building practitioners

21 Certificates by particular building practitioners For section 40(a) of the Act, but without limiting that provision, a building certifier may rely on a certificate that work complies with the Act and these Regulations given by any of the following who is a registered building practitioner: (a) in relation to the compliance of the design of the building with these Regulations – an architect; (b) in relation to the structure of a building – a structural engineer; (c) in relation to the mechanical systems of a building – a mechanical engineer; (d) in relation to the hydraulic services of a building – a hydraulic engineer; (e) in relation to the plumbing, drainage work and on-site sewage disposal system of a building – a plumber or drainer; (f) in relation to the design of the plumbing and drainage works and on-site sewage disposal systems – a plumber and drainer (design).