BREEAM is a company that provides environmental assessment methods and rating systems for buildings.

For existing buildings, a BREEAM-in use assessment uses recognized measures of performance, which are set against established benchmarks, to evaluate a building’s specification, design, construction and use. The measures used represent a broad range of categories and criteria from energy to ecology. They include aspects related to energy and water use, the internal environment (health and well-being), pollution, transport, materials, waste, ecology and management processes.