The notion of circularity is increasingly present in debates about sustainable buildings. Reusing construction elements is often considered a good strategy to achieve a substantial decrease in the environmental impact of construction industry. However, a range of cultural, economical and social challenges need to be overcome in order to implement reused elements in ambitious architectural projects . This book examines these questions and offers some suggestions on how they may be answered. It develops an historical perspective on reuse practices, gives an insight on current trends and examines future perspectives.