This document discusses sustainability in construction and provides recommendations based on case studies. It defines sustainability as having three pillars: environmental, social, and economic. A sustainable construction balances all three by carefully considering environmental performance, social responsibility, and economic efficiency to avoid negatively impacting future generations. While some methods reduce energy waste and increase building performance, consumers are often unaware of them or put off by costs. The document recommends several systems and designs used in case studies, such as airtightness, natural ventilation, and sensors, to reduce carbon emissions and energy costs in a new sustainable school.