The challenge of this project is to develop a house for less with the energy performance of passivhaus type. So the idea is to build a principle of prefabrication with wood frame to optimize the rapid implementation ("Out of water from air" in 4 weeks) and create a simple volume with a functional plan. The clarity of the outer volume and facades is also reflected in the plans: a large area through the ground floor, which includes a living room and kitchen offers flexibility and maximum brightness. With large windows the plant environment is an integral part of this piece. North side is the functional part, which hosts the entrance with a lock, a shower room and an office. The floor consists of three bedrooms, a bathroom and a laundry room and basement cellar. The coating of the facades is wood siding, openwork natural douglas to integrate into the plant environment in an ecological mind. Also to reduce energy consumption a double flow ventilation with a wood stove was installed.