Insights · Building physics

A rating checks the design, not the build.

Every compliance route assesses the drawings. Checking the finished house takes a few hours.

Every compliance route, NatHERS and H6V2 alike, assesses a design at the drawing stage. Neither measures the airtightness of the finished house, checks that the insulation went in as specified, or catches a product substituted after approval.

If performance matters to you, check the finished house. An insulation inspection at handover, and an airtightness (blower-door) test by a certified tester, take a few hours, and they tell you whether the house you paid for is the house that was modelled.

SourcesCSIRO, Air infiltration of new dwellings in Australia (2024); Victorian Building and Plumbing Commission, Practice Note EE-03.

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