This thesis aims to compare the performance of building integrated PV to “market leading” building applied PV and determine which technology is the most profitable. A case study is conducted of the real estate company Vasakronan’s two buildings Magasin X and Celsius which have both building-integrated PV in the facade and building-applied PV on the roof. The power output from the building-integrated PV systems compared to the building-applied PV systems is studied for each of the four seasons of the year. The system design including technical specifications for the modules and inverters as well as relevant weather data for Uppsala was implemented in the simulation software SAM. By simulating the PV systems in SAM an expected power profile is generated which in comparison with the actual power output from the PV systems could indicate if they are performing optimally. A Life Cycle costing (LCC) analysis is performed to give an understanding of the economic profitability of the different technologies over time. To include the perspective of the challenges in expanding the market for building integrated PV in Sweden, two interviews are conducted.  The results show that the BIPV generates more energy than the BAPV per square meter during the winter. During the spring and autumn, the weather conditions have a great impact on the perfor- mance of the solar modules. During sunny days of spring the temperature of the modules increase which decrease their efficiency and hence the generated power. The results also indicate that the actual power output from both the BIPV and the BAPV overall are performing as expected from the theoretically generated power in SAM. There are cases where the facade-integrated photovoltaics exceed its theoretical power output values. In contrast, roof-applied photovoltaics exhibit a closer correlation with theoretical values, although with a tendency to underperform overall.The life cycle cost analysis indicates that for both buildings, Magasin X and Celsius, only the BAPV system is profitable. In contrast, the BIPV installation is not cost-effective without subsidies. However, as shown in the sensitivity analysis, the electricity price is a factor which has a large impact on the profitability of the system. With a doubled electricity price the entire solar cell installation of Mag- asin X has a pay-back time of 10.6 years and is considered profitable. It can also be concluded that there is a lack of knowledge of how to implement BIPV in the most efficient way as well as what amount of energy the BIPV systems are expected to generate. To expand the BIPV market, stakeholders need to share their knowledge and a standardized process will need to be developed for choosing BIPV for new buildings. Subventions can motivate companies to implement BIPV in practice which is crucial for the spreading of such knowledge and the future development of BIPV.