This work describe the cost structure in construction projects. In first part of this work the project, project management and it’s cost and quality was described. It represent traditional and contemporary approach of quality managing as his moving in time. Second part of work contains a review model of managing quality expenses, and analysis the main determinants of each particular model. It shows great connectivity and expenses in construction projects and how one item affect on other. Except the cost and quality, there are the third item that is also important, and it is time. If time and expenses limit the project we can expect that project quality will also be worse. Since every construction project is a unique process, it is important that the quality, costs and time of the project are linked and that they have only one goal, which is the satisfaction of all the contracting parties of this project. At the end of the work, a list of poor quality sources was made in construction projects and there are proposed ways to reduce the number of projects in the future, which the execution results with poor quality and extremely high costs.