In Stockholm today, there is a shortage in housing and one way to supply the market with new housing is through densification. This degree project investigates the possibility to improve an existing courtyard and surrounding through densification. By visiting six different courtyards a greater understanding of what factors that makes up a good courtyard was obtained. The doctoral thesis Uncommon ground written by Eva Minoura set the base for the deeper understanding of the structure of courtyards and what creates ownership within them. Based on the research a specification of requirements was developed describing how to carry out a socially sustainable densification. By locating areas with low ownership and build there, territorial boundaries can be changed. Densification with minimal effect economically and ethically on the neighborhood enables the current qualities and living to be kept and the densification is positive for the area. The importance of clear territorial ownership and respectful densification led the way for this suggestion of building densification. The purpose with the project is to highlight a densification which reshapes an existing territorial misuse. Thereby increasing the value, not only for the separate home, but the value of the area. The question is what values to follow and how to implement a densification according to them. The result is illustrated through drawings of a densification in Bärkinge, an area in the Stockholm suburb Tensta. The proposal is attached to the rapport. The proposal is a townhouse with four separate homes each 208 !". Its placement, corner to corner with existing development changes the territorial misuse by enclosing the previously open courtyard. The proposal is changeable homes, adaptable over the years. The entry level is flexible in the sense that it can be altered without large affection to the house. Each home stretches over three floors where the upper floors two and three are constructed in a typical Swedish family home layout with bedrooms on top and living and kitchen underneath. The project presents four alternative plans, one for the large family, one for multiple living, one with extra accessibility and the last with space for home office. The project is a suggestion of a building in a Swedish million dwelling area using ground territorial misused ground and making a new attractive area using studied preconditions for densification.