The main goal of the project is to increase living space in 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 is made up by two converging slopes that collect rainwater. In the walls, certain pieces were placed at an angle in order to support bunk beds, side tables and shelves. The intervention provides lighting and cross ventilation. Minimum investment; radical improvement.