The existing building stock is here and much of it is responsible for consuming energy, water and other resources at an unsustainable rate from both the environmental and the economic standpoints. Focusing on non-residential buildings, this course will examine the issues, techniques and processes that are involved in turning these buildings into sustainable consumers, whether through relatively simple retrofits or major renovations. Among the topics to be reviewed will be assessing existing performance, instituting building commissioning, improving energy and water efficiency, limiting (re)construction waste, improving indoor environmental quality, supporting sustainable operations and considering renewable energy sources.