Today's era, accompanied by low birth rates and often by high standards, requires a precise assessment of the performance of the required facilities. The population strives for better, more modern, more innovative design, execution of works and the very use of facilities. In accordance with the above, Investors are increasingly entering the issue of works. In order to keep the chances of failure to a minimum, an investment study is decided. The word itself says that this term indicates the success or failure of the project. Economically, the cost of making the Study is only a small part of all the costs that are following through the project. Therefore, it is very wise to make a study and in some way, make sure and keep in mind future possible additional costs. This paper mentions the concepts needed to make the study easier to understand. For the sake of easier understanding, an example of a kindergarten was conducted in which the necessary parameters for the functioning and use of the building or educational institution are stated. This implies the construction of the facility itself, but also the later use and the necessary staff, expenses and receipts that will be used in the coming years. In order to justify the Investment Study, a calculation will be used that will show the payback period of the investment, which is of great importance for the Investor when making a decision or entering into further design and execution of works. The end result will be a display of the internal rate of return for a period of 10 years. When calculating, various external influences will be taken into account, such as the location of the construction, the size of the building. Equally, given the financial possibilities, the assumption is that the project will include an economy that will turn its economic benefits into financial benefits, all for the purpose of a positive outcome of the Study and thus a positive outcome of the project. After obtaining the internal rate of return and the precise net present value, the Investor decides to continue the work. The study is considered successful if its results, in the opinion of experts, show positive results and cost-effectiveness of further project implementation.