Eh is a compact residential housing with clear objectives: energy saving, space optimization and high utilization of light.In a plot with a steep slope, we take this situation to produce a negative space and develop our home from a basic structure of precast concrete, being identifiable with a bridge, will have advantages of thermal and acoustic insulation to be cradled between ground planes under the surface of a green cover.The orientation of the main facade, fully south and the rear opening to a patio, making almost always have a powerful direct lighting, or in the absence of, a pronounced diffuse light. It will also be a virtue of his constant willingness to cross ventilation.Constructively we define two planes, with the main structure of concrete plates and substructure elements of light wood, to accommodate the insulation and ventilation systems housing always an optimal comfort and closure system facades, and to provide additional safety with closing blinds.A lo largo de los diferentes planos verticales generados en los huecos y fachadas de la vivienda, se situan una serie de sistemas de generación térmica y eléctrica para suministrar un aporte energético constante al sistema.Throughout the different vertical planes generated in the hollows and walls of the house, are located various systems for generating heat and power to supply a constant energy system.