The aim with this thesis work is to examine a supplement building that fulfils the requirement forthe Boverket subsidy stöd för hyresbostäder och bostäder för studerande (2020). A proposal ofthe design of the supplement building on top of the already existing building in Flogsta, Uppsalais created and a profitability analysis for Uppsalahem is made.The three issues examined in the project are: How should this supplement building optimally be designed to meet the demands fromUppsalahem, the subsidy and Swedish building regulations? Is it estimated profitable to fulfil the increased energy requirement in the subsidy? Is it assessed profitable for Uppsalahem to go through with the project? The Supplement building is designed after the recommendations from Swedish Buildingregulations and Suitable International Standards, the ultimate floor plan resulted in 27apartments for students with 18 studio apartments, 1 two-room apartment and 8 three-roomapartments. The energy use calculations proved that the increased energy requirements could not bereached for the project and an increased subsidy could not be obtained. The profitability analysis resulted in an approved profit margin for the project. The subsidywithout the energy bonus resulted in a total subsidy of 11,2 million kr and a profit of 4,8 %.