Energy Rating Certificates
A NatHERS Certificate allows builders, certifiers and regulatory authorities to quickly confirm that a building has been built to the design on which the energy rating is based.
During the National Construction Code 2022 transition period (1 October 2022 to 30 September 2023), the 2019 version of the NatHERS Certificate can be used to demonstrate compliance with National Construction Code 2019.
More information on transitional arrangements is available here. You can also see this table outlining when states and territories are adopting NCC 2022.
Changes to Certificates
An updated 2022 NatHERS Certificate Guide is now available.
The certificates will provide new information for households on the greenhouse gas emissions of a home, the costs and energy used by major appliances, and the impact of solar and batteries. This will help householders understand their home’s overall energy performance, helping them improve the comfort of their home, while reducing energy bills.
Certificates will continue to display a ‘thermal’ star rating out of 10 based on how much heating and cooling is needed to keep a home comfortable. The ‘Whole of Home’ rating is out of 100. This is based on energy use for the home’s appliances (heating and cooling systems, hot water heaters, lighting, pool and spa pumps) and solar panels and batteries.
The rating considers energy used for heating and cooling, and appliances, minus energy generated from solar panels. Ratings above 100 are possible (100 is considered a net zero energy value home). One way that a home may rate over 100 is where the home generates more energy than it uses.
If a 'Whole of Home' assessment has not been undertaken, this will be specified on the certificate.
Accredited and non-accredited certificates
The new certificate provides a comprehensive and uniform approach to displaying important home energy rating assessment information. It comes in two formats:
- A certificate that displays the NatHERS logo and can be printed in colour – produced by accredited assessors
- A non-accredited report without the NatHERS logo and only available in black and white – produced by non-accredited assessors.
While it is not compulsory to be accredited in all states and territories, the logo allows anyone to easily verify that the person rating a home is skilled in completing NatHERS energy ratings.
A non-accredited report without the NatHERS logo is produced by a non-accredited assessor (or rater) using NatHERS accredited software. Non-accredited assessors are not required to have any formal qualifications, maintain insurance or undergo quality assurance checks on their ratings.