Seismic Compliance Requirements State by State in Australia

AS 1170.4 is a national standard adopted by the National Construction Code, which means the technical requirements for seismic design are consistent across Australia. However, the way compliance is enforced, documented, and verified varies significantly between states and territories. Builders working across multiple jurisdictions need to understand these differences to avoid permit delays.

The National Framework

All states and territories have adopted the National Construction Code (NCC), which references AS 1170.4 as the mandatory standard for seismic design of Class 2–9 buildings. This means the technical requirements — earthquake design categories, hazard factors, Section 8 design procedures — are the same everywhere.

What differs between jurisdictions is:

• The registration requirements for engineers who can issue certificates of compliance
• The specific forms and documentation formats required by state building authorities
• The level of enforcement and audit activity by state regulators
• State-specific transition provisions for NCC 2022

Victoria

Victoria has the most clearly articulated seismic compliance framework of any Australian state. The Victorian Building Authority (VBA) has published specific guidance on seismic design, identifying it as an area of inconsistent practice and clarifying the roles of practitioners.

In Victoria, certificates of compliance for seismic design must be issued by an Endorsed Building Engineer registered with the VBA. The relevant form is a Section 29A Certificate under the Building Act 1993. This certificate must be submitted to the Relevant Building Surveyor before the occupancy certificate can be issued.

The VBA has indicated that it is actively monitoring seismic compliance on Class 2–9 projects and that non-compliance is a priority enforcement area.

New South Wales

In NSW, the Design and Building Practitioners Act 2020 (DBP Act) introduced a new registration framework for design practitioners, including structural engineers. Seismic compliance certificates must be issued by a Registered Design Practitioner with a structural engineering registration.

The DBP Act also introduced the concept of a Design Compliance Declaration — a formal declaration by the registered practitioner that the design complies with the NCC. This declaration is lodged on the NSW Planning Portal and is publicly accessible.

NSW has one of the most digitally advanced compliance frameworks in Australia, with the Planning Portal providing a centralised repository for compliance declarations and certificates.

Queensland

In Queensland, structural engineers who issue certificates of compliance must hold registration as a Registered Professional Engineer of Queensland (RPEQ) under the Professional Engineers Act 2002. RPEQ registration is administered by Engineers Australia.

The relevant compliance certificate in Queensland is a Form 15 — Certificate of Inspection, issued by the RPEQ after inspecting the completed work. Form 15 certificates are submitted to the Principal Certifier (the Queensland equivalent of the Relevant Building Surveyor).

Queensland has a higher seismic hazard in some regions than other states — particularly in the north, where proximity to the Coral Sea subduction zone increases Z values.

Western Australia

Western Australia has historically had the highest seismic activity of any Australian state, with the 1968 Meckering earthquake (magnitude 6.5) being the largest recorded onshore earthquake in Australian history. WA's seismic hazard map shows significantly higher Z values for the southwest of the state compared to eastern Australia.

In WA, structural engineers issuing seismic compliance certificates must be registered with the Building Commission WA. The state has its own building regulations that sit alongside the NCC, and builders should confirm with their building surveyor which specific forms are required.

South Australia

South Australia has a moderate seismic hazard, with the Flinders Ranges fault system representing the most significant seismic risk in the state. Adelaide has experienced several notable earthquakes, including a magnitude 5.4 event in 1954.

In SA, structural engineers must hold appropriate registration under the Professional Standards Act to issue compliance certificates. The state has adopted NCC 2022 with standard transition provisions.

Australian Capital Territory

The ACT has adopted NCC 2022 and follows the standard AS 1170.4 compliance framework. Building certifiers in the ACT are registered with Access Canberra. The ACT's seismic hazard is moderate, with Z values similar to those in eastern NSW.

Northern Territory

The Northern Territory has adopted the NCC and AS 1170.4, but enforcement has historically been less rigorous than in southern states. The NT's seismic hazard is generally low, with Z values among the lowest in Australia.

Tasmania

Tasmania has adopted NCC 2022 and follows the standard compliance framework. The state's seismic hazard is low to moderate. Engineers issuing compliance certificates must hold appropriate registration under the Engineers Registration Act 2021.

Practical Implications for Builders Working Across States

For builders and developers working across multiple states, the key practical implications are:

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