For the design of Casa Tierra (Earth House) the project was developed in order to be friendly with the surroundings and with a high energetic performance respecting all the premises in the master plan and establishing how the architects consider all the XXI century houses should be done. The project is supported on the conscience that has always been Serrano Monjaraz Arquitectos trade mark when developing architecture. As any other project it is adequate to the environment and also responds to the sustainable design regulations that have been increasing in the last years.