In Innerberg, Switzerland, on a former wood work site, a new apartment building has been designed. Based on an existing volume of 3 meters height and a depth of 20 meters, a flexible living space appears where once carpenters and joiners used to build furniture.The existing volume is divided in 7 parts. Two Apartments are building the basic type. The upper apartment has an additional gallery. The distinct floor plan design results in an outstanding amount of freedom. The kitchen and bathroom arrangement creates the structural core, from there, everything is possible.Whether it should be a loft without any further subdivisions or a 3 room apartment.Another feature is the additional room between the living space and the balcony. In summer, it serves as loggia, in transition period as living room extension and in winter as a passive energy source.The expressed structure defines the character through its authentic materials. The structure of the building is as well its surface. Dividing walls and ceilings are made of concrete, facade and roof are designed in wood.The two materials create an authentic mood and atmosphere.With controlled ventilation, solar powered heating, a compact volume and passive sun protection, the house uses very little additional energy and achieves the Swiss Minergie passiv standart.