House Extension is a minimalist residence located in Schaerbeek, Belgium, designed by Edouard Brunet, François Martens. Taking into account the city’s urban tissue, the project is the renovation of a Brussels typical terraced-house. Originally inhabited by a single family, the house appeared too big and difficult to take care of after the children grew up and left. The owner of the house then decided to sell the last two floors to a friend, in order for him to convert them into his own appartement. The architectural project consists in renovating and turning the existing single family terraced houseinto a building of two separate flats. Architects Edouard Brunet and François Martens teamed up in order to complete this relatively small yet ambitious project.