Home Energy Rating in NSW 2026: How to Cut Your Energy Bills by Up to 80% With a NatHERS Assessment Quick answer: A Home Energy Rating is a 0–10 star assessment of an existing Australian home, run by an accredited assessor under the Nationwide House Energy Rating Scheme (NatHERS) . As of August 2026... basix-certification energy-efficiency heuf home-energy-rating nathers nsw-housing renovation sustainable-building Aug 27, 2026