Leed, acronym for Leadership in Energy and Environmental Design, is an evaluation of the energy and environmental performance of the buildings aiming to the promotion and spread of the so called “green” buildings that are characterized by high standard of energetic and environmental sustainability. The Leed system was born in America in 1933, promoted by the US Green Building Council (Usgbc), a non-profit organization of more than 11 thousand members. Being part of the LEED scheme allows to obtain a certification of the buildings that have achieved the required levels of energy and environmental performance and in compliance with specific eco-friendly requirements.

The building undergoing certification must meet all the mandatory requirements, while the credits are awarded based on the level reached by the requirements considered, assessed according to established criteria.

The Leed structure includes seven areas:

The system is based on the assignment of points for each of the requirements characterizing the sustainability of the building, from the sum of those credits derives the level of certification obtained: