How can NatHERS energy ratings be improved cost-effectively for new single-family homes in Western Australia?

To improve NatHERS energy ratings cost-effectively for WA homes, designers should first optimise passive solar principles, including proper building orientation, shading, and insulation levels tailored to local climate zones. Furthermore, upgrading to high-performance double glazing for key living areas and sealing building envelopes to minimise uncontrolled air leakage can significantly boost thermal performance without requiring expensive active mechanical systems.