The current era is favorable for the expansion of renewable energy sources and their integration into the energy economy of buildings for residential or commercial use. According to the long-term statistics, buildings consume about 40 % of all energy produced. At the same time, the buildings together with the industry provide a huge potential for the installation of renewable energy sources. The article presents advantages and disadvantages of particular types of the most commonly used photovoltaic systems integrated in buildings. It describes the ways to maximize the use of the installed renewable sources, the assessment of the rate of return of the particular types of photovoltaic systems, not counting the subsidy support, and evaluation of the installation complexity (both financial and technical).