eTool Certification

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.

eTool enables effective comparison between business as usual design and material selection, with alternative methods, as well as life cycle costing and carbon accounting over the life of a building. This enables a designer or project team to compare cost-benefit scenarios in terms of a quantifiable performance and cost.

The following graphs, illustrate the expected environmental performance of Josh’s house across energy and water use, as well as greenhouse gas emissions based on modelling at the design stage. The life cycle cost comparison was also calculated in relation to an average new Perth dwelling.


Modelling indicated that by using well-established technology and design features, the homes would require less than 10% of the energy used in a typical Australian new home, saving over $2,000 a year in energy costs.


Modelling indicated the homes would use around 40% of the scheme water of a typical Perth home. This is achieved through a combination of best practice water efficiency measures (both inside and outside) as well rainwater being used for all indoor use, with scheme water as a back-up when the tank is empty. Greywater is used for garden irrigation.

Green House Gas Emissions

Modelling indicated that the homes would emit less than 10% of the greenhouse gas emissions normally emitted by Australian dwellings. This is achieved by building a house that lasts longer, is more energy efficient and generates its own power with solar panels.

Lifecycle Cost Comparison

Modelling indicated that the homes would be more affordable than the average Perth house. Although a little more expensive up front, when accounting for reduced operating and maintenance costs within 7 years it pays itself off. From that point the benefits get larger over time.

Other Sustainability Assessments

NATHERS Assessment

The Nationwide House Energy Rating Scheme, or NatHERS for short, is a performance based rating system that describes the thermal performance of a home.

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Living Key Assessment

Living Key offers a set of rating tools, services and resources for industry and householders to assess and rate the liveability and sustainability of urban residential properties. Our detailed property reports provide an easy to understand sustainability assessment rating of the key liveability and sustainability features and attributes of your property.

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HIA GreenSmart House Design Accreditation

The Housing Industry of Australia (HIA) is the national industry association for Australian building professionals, representing the interests of the housing industry at regional and national levels.

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