The unique characteristics of this row house come from a very narrow plot (3.8 meters wide) and a very long backyard. The clients, a couple with two children, need the standard program for a family of four. Within the volume of the existing building, we agree to put in three bedrooms of similar sizes and proportions. On the ground floor, looking over the street, the older son’s bedroom. On the second floor, two more bedrooms: one for the couple and the other for the younger son, each located along one of the façades. The center is occupied by two bathrooms: one on the second floor and another on the ground floor, also for guests. The volume of the building is expanded in order to place the kitchen-dining-living room adjacent to the patio garden, at the same level. A new loft space is added under the roof, which provides an extra multi-purpose room that can be used as a study or as a fourth bedroom. The original staircase is maintained. There is no need for a parking area.