Housing remains one of the major concerns of the French -- size, cost, rent, quality of life, and proximity to the workplace. However, these criteria are hindered by factors such as the scarcity of land, the growing increase in the price of new (and old) homes, and the increased cost of credit. The department CAUE Rhone (Conseil d'architecture, d'urbanisme et d'environnement) explores the issue of building in the Lyon region (1945-2015) in the light of contemporary challenges such as urban sprawl, densification, neighborhood renewal, social diversity, and energy efficiency.