Perth, Western Australia's capital and by far its largest city, sits within NatHERS climate zone 13, a warm temperate zone with hot dry summers and mild wet winters. As the last Australian capital to transition to NCC 2022 energy provisions from 1 May 2025, Perth's building industry is adapting to the new 7-star NatHERS minimum and Whole-of-Home requirements. The city's extensive suburban development, dominated by single-storey detached houses on large lots, creates high demand for NatHERS assessments as builders adjust to the increased energy efficiency standards.
Perth's climate zone 13 features hot dry summers with temperatures regularly above 35 degrees and long periods of sunshine, mild wet winters with cool nights and occasional frost in outer eastern suburbs. The Fremantle Doctor, a reliable afternoon sea breeze during summer, provides natural cooling relief for suburbs west of the Darling Scarp. Eastern suburbs beyond the scarp experience higher summer temperatures without this coastal influence. Perth homes benefit from good roof insulation with reflective barriers, external shading particularly to west-facing windows, and cross-ventilation that captures the sea breeze. The dry climate makes evaporative cooling highly effective and energy-efficient. The traditional double-brick construction common in Perth provides good thermal mass for stabilising internal temperatures.
New homes in Perth must achieve a minimum 7-star NatHERS rating under NCC 2022 energy provisions that commenced on 1 May 2025. Zone 13 assessments evaluate the building's management of hot dry summers and cool winters. The Whole-of-Home assessment is new for WA builders and requires evaluation of fixed appliances and renewable energy alongside the building fabric. Perth's high solar resource means rooftop solar can contribute significantly to meeting the energy budget requirements.
No assessors currently listed in Perth.
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