What attracted the investors to the plot in Siekierki was the location, a natural extension of Warsaw’s city centre, only five minutes from the Royal Palace in Łazienki. The price was another crucial argument – the narrow strip of land and its exposure to the north had already discouraged most potential buyers. Moreover, nearly half of the width of the plot was excluded from building development according to the local land management plan, which left the inves – tors with a strip barely six metres wide, running alongside the southern border of the plot. We decided to build an equivalent of the American-type “shotgun” house. The shotgun as – sociation was further deepened when we extended the upper, three-bedroom floor by seven metres in relation to the ground level, which contained the day zone and guest bedroom. The suspended floor covered the entrance to the building and two parking spaces. This “heroic cantilever” was made thanks to the use of an untypical technology of the walls. It is composed of an outer reinforced-concrete shell of the 18-centimetre thick wall and roof, and an inner, air-separated layer of the wooden house. This also allowed us to avoid a curtain wall by using a light and decorative, mock-solid concrete overlay.