The theme that is elaborated in this thesis is the application of the concept of Lean construction in construction projects. Given the poor management of construction projects that are represented in world practice, the introductory part explains the concept of wastes and their division and provides theoretical knowledge about the possibilities of their elimination using Lean construction. Theoretical analysis of Lean management includes a description of its historical origin and the definition of Lean principles and tools/techniques based on Lean thinking. In addition, the benefits that are mentioned in the literature and realized during its implementation are listed (and recognized in the examples from practice). In order to better understand the way Lean construction is applied in the project, a detailed case study was approached on the well-managed project of building a production plant in Austria. By conducting a case study, data was collected on the applied Lean tools/techniques and the manner of their application, with special emphasis on the participants in the application of Lean tools/techniques and their roles and responsibilities. Of the known tools/techniques from the literature review, 65% of them were applied in the observed project, which is proof of the seriousness of the top management to accept Lean as a new way of managing. The main participants in the application are the Lean construction engineer and site managers who were responsible for all Lean tools/techniques, and accountable for the delivered result ormconsulted about certain aspects of the application. Also, the application of Lean principles and tools/techniques in the project had an impact on reducing certain types of wastes, which ultimately leads to savings in management, as is the case in general practice.