A study undertaken by the Sustainable Building Research Centre at the University of Wollongong has shown that homes built with a higher energy efficiency rating can bring increased capital gains and higher sales figures of up to 10% more.

The Nationwide Housing Energy Ratings Scheme (NatHERS) rates the energy efficiency of homes based on their design and energy-saving features such as solar panels, batteries, insulation, double glazed windows, draught sealing, efficient heating, and orientation of rooms.

  A house with a NatHERS rating of 7 stars could expect to sell for 10 per cent more than a comparable house with a lower rating of 3 stars.

There are several ways to achieve a seven-star efficiency rating such as high levels of insulation, solar hot water and energy efficient air conditioning, but solar plus batteries is expected to play a major part in achieving a minimum seven-star rating.

There is no current energy efficiency rating scheme for existing buildings, however the results from a survey undertaken by Energy Consumer Australia in Dec 2019 shows that more than half of all consumers want a mandatory labelling scheme disclosing the energy efficiency of homes.