To look at the issue of residential housing is to take over a market that has too often escaped architects. To turn to their renovation is to discover a praise: What second life to offer to individual houses often conceived in defiance of the elementary environmental concerns (Thirty glorious oblige!)? How to transform these pavilions which have concretized a family dream more often that are often not well adapted to the format of the successors? The exercise is politically exciting; Karawitz’s approach is pragmatic. Today’s house is ecological and economical, it does not get angry with its context while being anchored in its time, it is communicating on its virtues and dialogue to the own as well as figurative with its neighbors. As a detachment from a society focused on homeownership, the 21st century pavilion turns to the current challenges of sustainable development and bids farewell to generic and impersonal habitat.