This report provides a comprehensive overview of sustainability in construction, emphasizing green building principles and practices. It defines sustainability within the context of construction, highlighting the overlap of environmental, economic, and social considerations. The report explores key aspects of sustainable building design, including site selection, water efficiency, energy efficiency, material selection, and indoor environment quality. It examines the benefits of green buildings for building owners, users, and society, such as reduced energy consumption, pollution, and waste. Furthermore, the report delves into the prospects of green buildings and their development, focusing on renewable energy sources, water conservation, and efficient building management systems. It also discusses sustainable materials, emphasizing life cycle stewardship, reuse and recycling, low toxicity, local sourcing, and durability. The report concludes with an explanation of the building envelope, its role in thermal comfort and protection, and its components, including walls, roofs, windows, and doors, which work together to ensure structural integrity and environmental control.