Star rating

The Nationwide House Energy Rating Scheme (NatHERS) supports efforts of Australian Governments to reduce the energy and greenhouse gas impact of residential buildings.


NatHERS encourages energy efficient building design and construction by providing a reliable way to estimate and rank the potential thermal performance of residential buildings in Australia.


Heating and cooling accounts for the majority of the average Australian household’s energy use but efficient building design can reduce the reliance on artificial temperature controls. To determine how efficient the design of an existing or yet to be built home is, it is given a star rating between zero and 10 stars. Homeowners can make use of these ratings to inform modifications to existing houses or in planning the designs for a new house.


The star rating is calculated using software accredited for this purpose under the Nationwide House Energy Rating Scheme (NatHERS). The software simulates expected conditions based on climate zones and other known factors about the location, occupancy and dimensions of the house. Allowances are made for different sized houses and different climates to ensure a fair comparison of buildings and consistent ratings across Australia.


While the software can be used by anyone, only an assessor  who has received NatHERS accreditation from a relevant organisation can provide a credible rating.