This proposed building system has a focus on a building that is possible to change over time. If the needs of the residentials changes, the apartment could respond to this by shrinking or growing in the sense of adding or contracting rooms from adjacent apartments and dividing rooms into smaller ones. This could make the residentials stay in the building even if changes happen. To be able to stay in the same apartment is important for the residentials to keep the social network in the neighbourhood, connections to different activities and work, for the children to not change school which could be difficult if moving etc. Three adaptable strategies are applied; elasticity, generality, and flexibility.