Unique in Switzerland, this house, whose basic building dates back to 1740, was extended in 2015 in a completely astonishing way. The owners called on the only company in French-speaking Switzerland to master the techniques of the Sarrazine vault to realize their dream: a construction in which one feels in harmony with oneself and with one's environment. With a minimum of rebar and a maximum of natural materials (hemp concrete, lime), the systematic use of the Sarrazine vault allowed the creation of this enlargement that one would like to call "work of art" . The house has 5.5 rooms, it is located one minute from the center of Châtel-St-Denis. Composed of three levels and the warm extension with green roof, it fits harmoniously on a richly wooded plot of 656 m2. Gas and wood heating (possibility of heating the habitat only with the stoves). Three shower rooms, a balcony, a large furnished garden shed, a vaulted cellar, a large covered terrace and two adjoining parking spaces, one of which is covered, complete this exceptional and unique property. A completely independent space can be created in the extension.