What are the latest changes to NatHERS ratings for new homes in Australia?

The latest significant change to NatHERS ratings, effective from 1 October 2023 under NCC 2022, is the increase in minimum energy efficiency requirements for new homes from 6 to 7 stars. This uplift aims to enhance thermal performance, reducing energy consumption for heating and cooling. Additionally, a new 'whole-of-home' energy use rating has been introduced, assessing the energy efficiency of fixed appliances like hot water systems and lighting, alongside the building fabric. This holistic approach provides a more comprehensive measure of a home's operational energy footprint, driving greater sustainability in residential construction.