A detached family house is organized in the maximum length towards west and the adjacent forest and east with views towards the lake of Zurich. A series of concrete cores with serving spaces structure the length, and split the house on several levels. In between, the floors, the building envelope as well as a split mansard roof are articulated in wood. With the specific form of the perimeter, a long cascade stairs narrows from more public towards the more private spaces for living, and embeds the house with the grown topography.