Starting point of the project is the fact that people and buildings are in a close relationship with the nature and that sustainable architecture based on social, economical, political and aesthetic principles is possible. The aim of the project „Cultural Heritage and Green Architecture“ is to research the traditional rural architecture of the poor population in Croatia and Serbia. In order to meet the needs of their owners, these types of buildings had to be self sufficient, economical and functional, hence their construction is based on the environmental protection principles. The aim is not only to present the historical review of the rural architecture, but also to actualize neglected cultural heritage in order to be used as an example, assistance and inspiration to the sustainable architecture projects today. Important segment will be collaboration with the people and communities engaged with the green architecture and Earthship movement.