The daily spaces, such as the kitchen and the living room have been located on the ground floor with a southern exposure in order to gain as much direct solar radiation as possible. On the northern side of the building there is a small toilet behind the kitchen and a small storing space below the stairs leading to the upper floor. In the mezzanine two north faced bedrooms and a bathroom with mechanical ventilation occupy half of the ground surface in terms of floor area. The remaining part of the mezzanine is used as technical space to provide accommodation for the battery and technical converter for renewable systems (PVs and solar collectors), as well as the

The choice of positioning the bedrooms on an upper floor has been taken because of the building shape resulted from the sloped roof. In fact, the initial decision of inserting one big pitched roof developed a huge high on the northern side of the building, allowing to create a mezzanine that could be used as evening area.

The space below the roof provides accommodation for the mechanical ventilation in both case studies as well as the pv's inverter and the solar collector's tank.