This dissertation explores the issues of contemporary circumstances that have had a significant impact on prince changes in constriuction contracts in the last few years. The legal regulations that shape construction contracts are analyzed, with special emphasis on the regulation governing contracted prices and have possibility of their amandments. The introductory part of this thesis discuss the construcstion contracts in general, its legal nature, characteristic and legal sources that regulate it. Since the thesis explores the contemporary circumstances that caused changes after the conclusion of contract, a key aspect in this thesis was the institut of changes circumstances, known as the rebus sic stantibus clause. It analyzes how this institute operates in comparison with the institute of force majeure and with the provision on price immutability from the Civil Obligations Act. Special attention is paid to price increases that are particularly problematic for contracts that have a provision on price immutability, which is the cause of the intervention of the Government of the Republic of Croatia with two adopted Conclusions to help solve the new problems of global market disruptions, which was also discussed in this thesis. In addition, the thesis analyzes the new Special Construction Certificates that were adopted and published on December 13, 2021, with an emphasis on their legal application. Their comparison with the binding provisions of the Civil Obligations Act is carried out and discusses the advantages and disadvantages they bring in the context of construction activities. By observing the developments, it becomes a clear chronology of efforts in solving challenges, starting from the development of new legal regulations to the intervention of the Government of the Republic of Croatia. Furthermore, the paper highlights and analyzes sliding scale safeguard clauses and index clauses, which are increasingly becoming commonplace in contracts, taking into account the principle of freedom of contracting. Their importance is recognized by the Civil Obligations Act itself, which includes them as naturaliu negotti in the provisions of Articles 626, 627, 629, which regulate price changes in construction contracts. Through this dissertation, the importance and complexity of the legal framework of the construction sector, which represents one of the key pillars of the modern economy, is visible.