Surely and not so slowly, the reconquest of Bordeaux's banks in 1995 had an impact as powerful as the “Bilbao effect”. 25 years later, Bordeaux has some 800,000 inhabitants, with nearly 10,000 more every year. The new mayor Pierre Hurmic, from the ecological party, defends the concept of frugal urbanism in his urban planning strategy. This assumed shift made us want to understand if and how this paradigm change was possible. How reflections on housing fit into those on the economy of the territory. For this reason, we have chosen this destination for the study trip of the first promotion of IDHEAL.