Results Summary

Impact Area

Total CO2e

/ Year


% Saved Against


eTool Medal
Embodied Carbon1330 kgCO2e-6%
Operational Carbon396 kgCO2e-77%
Total Carbon1726 kgCO2e-45%

Modelling of further CO2 reduction

First modelling demonstrated that the Proposed Design was achieving 34% CO2 savings. eTool modelled further reduction strategies and discussed these during the Optioneering workshop to demonstrate to the team how these decisions would assist in reducing the overall impacts of the project.

Of the strategies suggested by eTool, the following have been adopted by the BoPDHB team:

  • Lighting occupancy and light level sensors
  • Ultra high efficiency LED lights
  • EPD carpet tiles
  • High efficiency appliances
  • A post occupancy audit

Adopting these strategies resulted in further Co2 saving achieving 45% overall CO2 reduction of the future facility’s emissions.

Zero Carbon Design – Not a pie in the sky

Together with the BoPDHB team eTool went further and were able to demonstrate a Zero Carbon design was possible.  This design would achieve a further 104% CO2eq reduction compared to the Proposed Design. This design would have allowed the project to achieve carbon neutrality without purchasing carbon offset certificates.

ETool suggested the following Low Carbon strategies:

  • 140kW Solar PV (Grid Connected)
  • Incorporating 50% Fly Ash in Concrete Elements
  • Timber for Floor Structure and Window Frames
  • Cork Flooring to living areas (and EPD Carpets to Bedrooms)
  • Lighting Occupancy and Light Level Sensors and Ultra High Efficiency LED Lights
  • High Efficiency Appliances (dishwasher, washing machine, TVs)
  • Performing a Post Occupancy Audit

This assessment was conducted by Rob Campbell and certified by Leo Poli from eTool.