A Third-Party Independent Structural Review is required when additional assurance is needed to confirm that a structural design or existing structure satisfies the performance and compliance requirements of the NCC 2022 and the relevant Australian Standards. This type of review is typically initiated by the Building Surveyor (RBS), Council, or an insurer when the project involves complex load paths, non-standard construction, high-risk elements, or when performance solutions are used instead of the deemed-to-satisfy provisions. It is also essential in situations where structures have been constructed or altered without a building permit—such as unauthorized decks, extensions, or carport conversions—and retrospective approval is being sought.

Furthermore, an independent review becomes necessary when concerns arise about the adequacy of the original engineering, including visible defects such as cracking, movement, water ingress, or foundation settlement, or where there is conflicting engineering advice. In legal, insurance, or VCAT disputes, a third-party review provides impartial, technically robust verification from an engineer who has no involvement in the original design, ensuring the assessment is objective and credible. Overall, the purpose of the independent review is to protect public safety, support compliance, and provide all stakeholders with confidence in the structural integrity of the building or structure.