In addition to the mandatory NatHERS thermal performance rating required under the Building Code of Australia, the building designs have undergone further scrutiny to assess their environmental impact, sustainability & livability credentials.
Josh engaged two emerging local companies to assist with this process – eTool, who undertook the life cycle and carbon accounting assessment and Living Key who assessed the project across a broad range of sustainability criteria including energy, water, materials and biodiversity among others.
Overall the project rates very well, with the homes using less than 10% of the energy of a typical Australian new house, saving the occupants an average of $2,000 per year in energy costs. The houses emit less than 10% of the greenhouse gas emissions normally created by Australian dwellings and use around 40% of the scheme water of a typical Perth home, whilst still supporting a diverse and productive garden.
For further information on the monitoring of Josh’s House you can find fact sheets on the Josh’s House Resource Page.
eTool LCA software is an industry leading Life Cycle Assessment program that enables in-depth analysis of building inputs, as well as design performance modelling to account for both the embodied and operational carbon of a project.