Results Summary

Impact Area Total CO2e / Year / occupant (kg CO2e) % Saved Against Benchmark eTool Medal
Embodied Carbon 1,148 21 % increase
Operational Carbon -210 107 % etool_plat_medal
Total Carbon 938 77 % etool_gold_medal

Project features

Design life

High quality design differentiates this project from surrounding residences and extends the lifespan to 55 years by reducing redevelopment pressure in the near future. Higher design life means that all initial impacts are diluted over a longer period of time therefore improving the performance on a per year basis.

Materials and Construction

Optimised construction time (total of 16 weeks) resulted in less impacts from trade staff transportation to site. A careful selection of materials guaranteed higher thermal performance and durability, and lower maintenance requirements. Materials list included:

  • Structural Insulated Panels (SIPs),
  • Weathertex cladding,
  • Light-coloured Bluescope Colorbond Roofing,
  • Polar Double-Glazed Windows
  • Polished concrete floors

Operational Energy

The project was designed for reduced energy demand and included high thermal performance rating of 7 stars with ceiling fans as the cooling method, high efficiency LED lighting and solar hot water system with gas boost. After all energy efficiency measures were implemented, a large solar PV system of 5kW was installed.

Throughout the year, the house generates more electricity than it uses, therefore a net positive operational carbon performance. A total 107% operational savings compared to the benchmark.

Solar PV system

An increase in overall embodied carbon was mainly because of a large 5 kW solar PV system. It’s estimated the system will get replaced twice over the life of the building. However, the substantially reduced “Operational Impact” due to the renewable energy input offsets this increased “Embodied Impact” many times over during its design life.

The main advantage of a solar system is that it offsets carbon intensive grid electricity. The system will produce excess clean electricity which will generate carbon credits to offset impacts associate with materials and recurring impacts, resulting in a whole of building whole of life performance of 939 kgCO2e/occupant/year, or a 77% savings in equivalent carbon emissions when compared to a residential benchmark.

Achieving genuine sustainability

We know the importance that leading organisations have in guiding and inspiring us on the move towards a low carbon future. Mirvac’s sustainability plan has four main pillars: re-imagining resource, enriching communities, smart thinking and shaping the future of place. Mirvac design team recognises that Life Cycle Design is an important part of the solution. The company strategy for re-imagining resources considers Life Cycle Assessment to be conduct on every new project.

This assessment was conducted by Fei.

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