Architect-designed homes across Australia are demonstrating that substantial reductions in residential carbon emissions can be achieved using practical design and construction approaches, according to new research involving more than 330 housing projects nationwide.

The findings, released by the Australian Zero Carbon Housing Challenge in partnership with the Australian Institute of Architects and Cerclos, provide evidence of how practical design decisions can contribute to lower-carbon housing. Collectively, participating projects have recorded approximately 85,000 tonnes of carbon emissions reductions, equivalent to planting more than half a million trees or an average of about 1,500 trees for each home[1].

Titled ‘Australian Zero Carbon Housing Challenge: Architects progressing the Architecture Industry Decarbonisation Plan 2025-2050’, the report examines life cycle assessment (LCA) carbon performance results from architect-designed alterations and additions, new single houses and multi-residential developments nationwide.

Described as the first national evidence base of its kind, the research includes projects at different stages of development, from in-progress to delivered low- to net-zero carbon homes. It demonstrates how architects are applying practical and scalable solutions to residential design that can inform the broader housing sector.

“With more than 330 architect-designed homes participating nationwide, this report is compelling evidence that residential decarbonisation is achievable today, while also reminding us of the distance we still have to go,” says Australian Institute of Architects National President-Elect Ross Donaldson.

“The Australian Institute of Architects has set a clear pathway with its Decarbonisation Plan. Now, the evidence from the Australian Zero Carbon Housing Challenge shows that architects are already delivering meaningful, design-led emissions reduction in the residential sector.”

According to Donaldson, the lessons from these projects show practical design approaches that can help reduce emissions across Australian housing when building the next generation of homes.

“It also shows that affordability and good design go hand in hand – more than half of the homes modelled have been delivered to market through affordability programs. The solutions exist. Policy and regulatory reform are now needed to scale them to Australia’s housing pipeline,” he notes.

The report identifies early design decisions as a major influence on the lifetime carbon impact of residential buildings. Architects are achieving measurable emissions reductions through alterations and additions to retain and re-use existing buildings; compact and Missing Middle homes that expand housing choice; Density Done Well precincts that combine neighbourhood liveability and lower emissions; and Modern Methods of Construction to support efficient, scalable delivery.

“Participating low- to net-zero-carbon projects have also received more than 30 architecture awards, demonstrating that emissions reductions and design excellence can be achieved together,” Donaldson says.

“Since 2021, the initiative has supported architects to undertake ISO-compliant LCA, building a national architect-generated dataset and demonstrating the growing role of whole-of-life and upfront carbon assessment in residential architecture.

“As Australia seeks to deliver more than one million new homes under the National Housing Accord, the report highlights opportunities to apply these lessons at scale, through early design decisions, lower-carbon materials, electrification, renewable energy and more efficient housing forms.”

[1] LCA-modelled whole-of-life carbon emissions reductions are relative to the Australian Residential Benchmark.

Image source: https://www.architectureanddesign.com.au/editorial/features/sustainable-house-features

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