Bunbury, the largest city in Western Australia's South West region, sits within NatHERS climate zone 13, the same zone as Perth but with slightly more moderate conditions due to its southern latitude and coastal exposure. The city serves as the regional centre for one of WA's fastest-growing areas, with residential development in Bunbury and surrounding towns like Australind and Eaton driving demand for NatHERS assessments. Under NCC 2022 energy provisions adopted from 1 May 2025, new homes in Bunbury must meet the 7-star minimum with Whole-of-Home compliance.
Bunbury's climate zone 13 is slightly cooler and wetter than Perth, with winter rainfall from Southern Ocean fronts and warm dry summers. The Indian Ocean moderates summer temperatures, with sea breezes providing reliable afternoon cooling. Winters bring cool nights and occasional frost in outlying areas, with more consistent rainfall than Perth. The dual heating and cooling requirements, though moderate, mean building design must address both seasons. Good insulation, northern solar access for winter passive heating, and summer shading are effective strategies. The coastal location means salt air can affect building material longevity, and wind exposure requires attention to draught sealing for winter comfort.
New residential buildings in Bunbury must achieve a minimum 7-star NatHERS rating under NCC 2022, with energy provisions effective from 1 May 2025. Zone 13 assessments evaluate building performance across the warm dry summers and cool wet winters typical of the South West. The Whole-of-Home assessment considers fixed appliances and renewable energy, with Bunbury's good solar resource enabling effective contribution from rooftop solar systems to meet the energy budget.
No assessors currently listed in Bunbury.
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