The main goal of the project is to increase the living space of social housing, while improving spaces and quality of life, with minimum budget. A new concrete block module, a latticework of the same material and W panels, were placed over the prototype house. The roof was made by two converging slopes that collect rainwater. In the walls, certain pieces were placed to arrange bunk beds, side tables and shelves. The intervention provides lighting and cross ventilation. Minimum investment; radical improvement.