Sustainability is a concept that really begins before the planning phase and includes all kinds of professionals in the process until the end of construction. Sustainability is an "easy word" in current days, almost used like a fashion trend. Everyone wants a sustainable project and most of the times people don't know what it is, what to do or how to achieve it. The objective of this presentation is to establish some definitions, goals, and ways of thinking—in global terms—as well as the main criteria that can be adopted to improve sustainability, flexibility, life cycle cost, installations costs, maintenance costs, and strategic solutions such as HVAC parameters. The discussion will include the importance of goals and achievements.