Here the challenge was great: a house in a beautiful natural setting but difficult to access, recovery of old stone walls, integration of old materials with latest equipment in order to meet an exhaustive ecological specification with, in particular, the recovery of rainwater and almost all treated grey water to ensure irrigation and thus allow the creation of a very beautiful garden despite the absence of a well. We can also mention the swimming pool with biomechanical filtration, complete insulation of the frame in cork oak bark or even an imposing photovoltaic installation but which had to be as discreet as possible.