It is a UK green building certification system, launched in 1990 by the Building Research Establishment (BRE), similar to LEED. Both systems confirm the level of the sustainability performance of an asset. Â Confirming the level at which the asset was designed and built using strategies aimed at improving performance across all the metrics that matter most: energy savings, water efficiency, CO2Â emissions reduction, improved indoor environmental quality, availability of resources and sensitivity to their impacts.