O2-175 is a modern two-story, energy-efficient house. The house has three bedrooms. Ground floor consists of living room, which is connected with dining room, kitchen with pantry and toilet. There is also a garage with storage and utility room that are accessible from outside. The living room's sliding doors open to a covered terrace. Upstairs, there are three bedrooms and bathroom with an extra storage space that can serve as a wardrobe. This house is suitable for plots from width of 16.75 m (celar distance of 2 m on both sides). This house has low energy consumption for heating due to its very well optimized building constructions.