For CasaClima, sustainability in buildings is a holistic concept, which not only evaluates the energy efficiency but goes further by considering a broad spectrum of aspects. At the roots of the CasaClima sustainability seals lays the proven CasaClima energy efficiency certification extended by a set of criteria aimed at reducing the waste of natural resources, thereby limiting the environmental impact and assuring the wellbeing of the people who live or work in the building. The CasaClima Agency, a public and independent body, deals with all aspects related to the quality assurance of the entire construction process from the planning, to on-site audits and finally the issuing of the CasaClima certification.