The lowland generally means not only low but also flat land. The land where the present house will be built not a usual lowland. This area, called Kiskunsag is very structured by up 3 to 8 m high sand-hills. The building site contains a part of this sand-hill and this is outside the settlement. This natural conditions and the wish of

owner determine the architecture of the house. The owner wish as that the house is sunk in the earth where only two facadea are free from the earth.

The walls are from brick and the ceiling is from monolite steel concrete. The isolation against the moisture is made from special recycling plastic foil, called Sicofol which functioned properly in some similar establishments [4]. We have to rekcon on possible radon diffusion in the case of earth house. The above mentioned foil serves for the isolation against the gas leak, too. The floor is covered with more than 1 m thick earth layer. Great part of the energy need is met by sunshine with active and passive utilization. The shadowing of the terrace is solved by amorpous silicon based solar cells which are made by Dunasolar [5].

The house is two-level building. The levels are the living level and the cellar. The living level contains three bedrooms, a kitchen with dining room and a living room, bath. The living room, the dining room and the badrooms receive the light from the windows on the facade. The serving rooms receive their light from the lighting flues. The house is provided with natural ventillation which is solved by special ventillation chimneys. The garage, hobby rooms etc. are in the cellar level. The layer of earth cover is behind the retaining wall. The edge of this wall is softly curved, which corresponds to the form of sand-hill. The waste management of the house is also enviromental friendly where this is solved with root zone method. The energy source for water transportation is the solar cells. The isolation of the reservoir of water cleaning solved also with the above mentioned special foil.