Ecological BuildingLow-energy and diffusionally open prefabricated houses with timber frames offer high quality and rationally designed living environment. Using natural ecological materials is necessary for environment care and our own wellbeing. Choosing this kind of materials, which do not use a lot of energy while produced and are economical to build with, will become very important in the near future. The development of construction materials in general is increasingly oriented towards natural and environment-friendly materials. Following the knowledge of construction biology, which combines different materials, we use contemporary construction systems which are fast, economic and ecological. Our eco-buildings enable dwelling in a healthy microclimate, save the energy, offer low earth-quake risk and a higher quality of life in general.