Construction encompasses a large number of different activities related to the realization of new facilities and the reconstruction, adaptation and maintenance of existing ones. In order for the project to be successfully implemented from the idea to the return on investment, it is necessary to review and evaluate it beforehand and during the implementation of the project to monitor and control it in order to know the time and financial situation of the project at all times. As a basis for the development of investments in modern construction, increasingly demanding project financing is emerging. This graduate thesis is based on monitoring one of the largest indicators of project success, and that is the cost. The focus is on the construction phase in which the project is executed and requires constant monitoring. The work describes the financial and contractual aspect of the projects and the elements of financial control that is necessary for the successful execution of the project, and the mentions some methods, tools and processes for monitoring and control. On the example of the Sorting Centre of the Croatian Post project, the theoretical facts described through the text are supported. The method of project contracting, financing, method of payment, project control and other financial and contractual aspects mentioned through the work are described.