A typical street of Oporto's downtown: narrow, steep and dark. A set of boring house, incongruous and chaotic.We chose to follow the motto: "if you can not beat your enemy, join him": we added another piece to the current anarchy.The main facade is changed with the opening of new windows of varying dimensions.The rear facade is completely rebuilt, opening large windows to facilitate sunlight and indoor lighting.The existing structure of the house is maintained, respecting the dimensions of the slabs and perimetral walls, with structural function.