Do I need a soil test before building in Australia?

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Trades

Geo-Technical Engineer

By George Giannakakis · M.Arch · RLA300580 · HIA Industry Judge

Last reviewed: 1 March 2026 · How we research

Geo-Technical Engineer explained in detail

A consultant specialising in the investigation and reporting of the condition of substrate ground. They conduct soil tests to determine the soil classification, which affects the type of footings and slab required for your build.

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Frequently Asked Questions

Common questions about geo-technical engineer

Yes, a soil test (geotechnical report) is required for virtually all new builds and major extensions in Australia. It determines your soil classification (A, S, M, H1, H2, E, P) which directly affects your slab and footing design. Reactive clay soils (common in Adelaide, Melbourne, and parts of Sydney) require more expensive engineered footings.

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