181 William Street, an 'A' Grade Premium Services building (Property Council of Australia), incorporates latest design technology and innovative design solutions such as destination lifts, high performance glazing, solar domestic hot water preheat panels and other design features. This delivers a sustainable asset and reduces operating costs.

This process of achieving a NABERS rating involves a calculation of base building energy data (including electricity, gas and diesel oil) for the preceding twelve months by an accredited independent assessor and assessment of that energy against the size of the building and its hours of operation.

Base building energy incorporates the following energy sources required to service the building which excludes tenancy light & power;

  • Heating Ventilation & Air Conditioning (HVAC) – Electricity & Gas
  • Lifts – Electricity
  • Common Areas (Lift Lobbies, Foyer, Switchroom, Plant rooms etc – Electricity (Primarily Lighting)
  • Car Park – Electricity (Primarily Lighting and Exhaust)
  • Standby generator sets – Diesel Oil
On behalf of The GPT Group we are pleased to announce that 181 William Street has achieved 5 Stars with formal certifications received from the National Administrator of the NABERS Scheme.