LEED is a voluntary certification programme that can be applied to any building (commercial or residential) and covers its entire life cycle, from design to construction.

LEED promotes a sustainability-oriented approach, assessing building performance in key areas: energy and water savings, CO2 emissions reduction, improved indoor environmental quality, materials and resources used, design and site selection. Developed by the U.S. Green Building Council (USGBC), the system is based on awarding 'credits' for each requirement. The sum of the credits makes up the 4 levels of certification: basic, gold, silver, platinum.

CBI Europe has contributed to the highest certifications in buildings all over the world.