The thesis we want to show and demonstrate the possibility of influencing the preparation and planning of the project and changes in the implementation of construction projects. In the thesis we chose the example of the project of the construction works and renovation and enlargement works of the hotel building "Palace Hotel" in Portorož. First of all it is made, an analysis of the project and on this basis, it is made a model of organization for the implementation phase of preparation and planning projects for the construction and renovation of facilities. With the model of organization, we determined that it would be possible to carry out successful renovation of the facility and thereby prevent the occurrence of some major changes, which are also presented in this thesis. In the next step, it is necessary to examine the theoretical foundations for the management of change control and present them. With the examination of the theoretical model for managing changes control, in the thesis, we give the opinions on the conducted performed procedures, which have been taken to carry out the changes. Based on the analysis procedures carried out are presented as measures and improvements that could contribute to the effective implementation of individual project changes. Using a model for monitoring change control in the construction phase of the facility could contribute to the successful achievement of goals of the entire project.