CH2 building

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Council House 2 (CH2) is claimed to be Australia’s greenest and healthiest office building. It opened in Melbourne in August 2006 and has set a new world standard benchmark for design and construction of future high-rise buildings. The building has is described as visionary new building with the potential to change the way Australia and the world approaches ecologically sustainable design.

The Green Building Council of Australia has awarded CH2 six Green Stars which represents world leadership in office building design. The Green Star rating system separately evaluates the environmental design and performance of Australian buildings based on a number of criteria, including energy and water efficiency, quality of indoor environments and resource conservation.

Location Little Collins Street, Melbourne, Victoria 3000
Country Australia
Type Commercial building
Building size Medium
Contact City of Melbourne
Phone +613 9658 9658


Summary of features

  • Water-mining plant in the basement
  • Phase-change materials for cooling
  • Automatic night-purge windows
  • Wavy concrete ceilings which provide thermal mass
  • West façade of louvres powered by photovoltaic cells that track the sun
  • Plants are used to filter the light
  • 80 bike spaces and 9 showers for cyclists
  • 20 car spaces plus one disabled space.
  • The car park can be converted to office space or other uses.
  • Chilled water cooling system
  • Co-generation plant
  • Purge windows allow venting of warm air at night
  • Exhaust ducts modelled on termite mounds for expelling warm air
  • Solar hot water collectors
  • Multi-use water treatment plant
  • Roof landscaping
  • Chilled ceiling panels/beams
  • CH2‘s north façade comprises 10 dark coloured air extraction ducts that absorb heat from the sun, helping stale air inside rise up and out of the building.
  • The south façade comprises light-coloured ducts that draw in fresh air from the roof and distribute it down through the building
  • Occupants can control the flow of 100 per cent fresh air to their work spaces by floor vents.
  • Louvres made from recycled timber shade the west facade.

Multi-use water treatment plant

About 100,000 litres of black (toilet) water a day is extracted from the sewer in Little Collins Street. The sewage (which is 95% water), along with any generated on site, is put through a multi-water treatment plant that will filter out water and send solids back to the sewer. The extracted water is treated through a micro-filtration system to create A-grade clean water suitable for all non-drinking uses.

Some of the recovered water supplies CH2’s water cooling, plant watering and toilet flushing needs. The rest is used in other council buildings, city fountains and plants. More water will be saved through recycling water from the fire-safety sprinkler system and from rainwater.

Claimed benefits

  • It is estimated that in 10 years time the sustainability features will have paid for themselves
  • Healthier staff – less time lost to colds, flu and other illnesses
  • Increased workplace effectiveness
  • Less costs for public domain and infrastructure
  • The value of building as a guiding light in sustainable building.

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