Winner of the covetous HIA GreenSmart Energy Efficiency Award 2012, Sepp and Jesca’s beautiful house in Yallingup achieved a fantastic result and since completion has featured in a number of magazines around Western Australia. Integrating sustainability into his home and business life, Sepp runs an eco conscious building company SustainabuildNow which uses eTool LCA to give clients a holistic view of their design and all the information they need to live in a more sustainable, comfortable and affordable house.

The summarised results of this project:

Total CO2e / Year / occupant (kg CO2e)% Saved Against BenchmarkeTool
Embodied Carbon2,117.427 %
Operational Carbon-2,152.9121 %
Total Carbon-35.4100%

Project features

Design life

Increased functionality, quality and innovation resulted in a high design life ensuring materials would be fully utilised.
Local trade staff on the job reduced transport impacts.


Use of low embodied energy materials such as light timber construction.
Elevated timber floor on steel anchors eliminating the need for concrete.

Aluminium windows and doors with low E glass.

Operational Energy

The operational energy was optimised with the use of fans, natural wood heating and high efficiency appliances.

Hot Water

Hot water system using solar thermal and gas boost is one of the largest savings in this design. When the system is not taking all necessary energy from the sun, the primary energy necessary to heat the water is minimised by burning gas at source of use (as opposed to electricity which experiences in the order of 70% heat losses at the generator).

The instantaneous gas water heater also overcomes tank losses, only burning gas when required to boost water temperature. Instantaneous heaters are slightly less efficient at converting gas to water heat, however, the reduction in tank losses outweigh the efficiency losses.

Renewable Energy

Solar hot water and a Solar PV system offset the operational energy use.

The amount of embodied carbon was quite high due to the large Solar PV system and without it the “Embodied Carbon” component would have achieved a better rating. That said, the substantially reduced “Operational Impact” due to the renewable energy input offsets this increased “Embodied Impact” many times over during its design life.

Additional Features

  • Highly insulated floor, walls and roof.
  • Abundance of natural lighting and use of LED lights.





To find out more information on this building and others like it, please contact the Eco Builder Sepp Hock at Sustainabuildnow.

Alternatively please contact eTool to arrange a cost effective assessment or training on how to achieve best practice in low carbon building design.

This assessment was conducted by Henrique Mendonca.