The National Australian Built Environment Rating System, an energy efficiency rating tool for buildings, has been boosted from 5 to 6 stars due to increased building efficiency since the 5 star rating was introduced in 2001.
The new 6 star rating was recently launched by the New South Wales Office of Environment and Heritage. Office buildings using NABERS to measure and manage energy and water use improved greenhouse performance by an average of 11.5 per cent and water efficiency by 9 per cent said Office of Environment and Heritage Chief Executive Lisa Corbyn.
"In the 10 years since the New South Wales Government introduced the first environmental performance rating for offices, Australian commercial buildings have become so much more efficient the time has come to introduce a sixth star," said Ms Corbyn.
At present, around sixty per cent of Australian office space has been rated using NABERS, and around five per cent of rated buildings are currently achieving a 5 star rating, set as an aspirational target in 2000.
The 6 star rating will be awarded for 'Market Leading' performance, and will represent a 50 per cent reduction in greenhouse gas emissions or water use from 5 stars.