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Designing energy efficient buildings is one thing. Making sure they live up to their credentials is another. At this year's Ecobuild, the BRE will launch BREEAM In-Use, which it hopes will help us make this happen.

As the latest in BRE's suite of environmental assessment tools, BREEAM In-Use has been created to ensure buildings are run as efficiently as possible and provide a route for owners and occupiers to assess and improve the environmental performance of existing buildings.

According to Martin Townsend, director of BREEAM, it has been developed to recognise and encourage better building management and target investment in existing building stock.

The tool has been devised as an online application - in part to encourage its uptake - and will enable users to self-assess their buildings. The exercise can be part of an existing BREEAM assessment or carried out on buildings which haven't previously been rated.

• The building's asset performance, that is performance characteristics of the building based on its form and construction.
• 黑洞社区 management performance, in other words the management practices which effect the operation of the building and the consumption of energy and water such as occupancy patterns.
• Organisational effectiveness and how well management policies are implemented

EDF Energy has been involved in the development of the tool and has piloted it on nine buildings in its property portfolio. The firm has a commitment to cut energy use in its properties by 30% by 2012 and according to Paul Riddlesden, company energy manager, the tool can help in establishing benchmarks and where best to spend money on improvements.

The company assessed a number of buildings in its portfolio ranging in age from 1960s to 1995 throughout the UK. 鈥淚t took us 12 days to do nine buildings though bear in mind this was a pilot project,鈥� says Riddlesden and says they will look to use it further. 鈥淚t's not always practical to knock down existing buildings and start again, we will use the tool to inform decision making鈥�.

BREEAM In-Use also has a function where hypothetical changes can be made to the data and the knock on effect to the rating assessed. 鈥淭his will give facilities managers a chance to build the business case for improvements,鈥� says Townsend.

However, one of the most valuable things that could come from the launch of BREEAM In-Use is the database that will be built up of how buildings are actually performing. 鈥淚t will enable up to date benchmarks to be set,鈥� says Townsend. It should also enable some figures to be put to the relationship between sustainability and rental prices.