How can residential builders cost-effectively achieve a 7-star NatHERS rating for new homes in regional Victoria?

To cost-effectively achieve a 7-star NatHERS rating in regional Victoria, builders should prioritise passive design principles. Optimise orientation to maximise winter sun and minimise summer heat gain. Utilise appropriate insulation for ceilings, walls, and floors, specifying higher R-values where economically viable, considering regional climate zones. Double-glazed windows with a low U-value are crucial; strategically size and position them to control solar heat. Minimise thermal bridging and ensure effective draught sealing to prevent air leakage. Select light-coloured roofing and external finishes to reduce heat absorption. Integrating these measures early in the design process minimises additional construction costs and maximises energy efficiency gains.