LEED for Existing Buildings is an operational performance rating system for existing buildings; it provides standards and prerequisites for construction and site protection for building upgrades.

Due to the building upgrade component of LEED for Existing Buildings, there is sometimes confusion on whether Existing Buildings or LEED Canada for New Construction is the most appropriate rating system for a project, since New Construction also applies to major renovations. A general guideline can be used: if the renovations are worth at least 50% of the building’s value and impact the building envelope, New Construction is the most appropriate rating system. Otherwise, Existing Buildings should be applied to existing buildings.

LEED^® Canada for Existing Buildings is anticipated to launch in 2009. While this is underway, Canadian projects are encouraged to register directly with the USGBC.