House M-M is a private house of 170 m2 in Helsinki, Finland. It is designed for a family of four, with a separate flat for a grandgrandmother. Also the grandparents live in an existing building on the same plot. The guiding concept in the design was the relationship of private spaces within the houses to the shared garden and gradual shift from shared to the more private. Sustainability was another key principle. The building and the surroundings will be finalized in the spring of 2013.