Over the past five years, there have been signs of rising costs for various construction projects. This shows that the reading of the construction cost index is also increasing. In order to be able to make a comparison of the index of construction costs in different countries of the European Union, it must be concluded that, for the most part, it cannot be implemented correctly. In different countries, the criteria forming the cost index differ in different groups of construction works - housing, civil engineering, etc. A large number of European Union member states publish construction price indices, which mostly differ from each other in terms of the type and purpose of the index, the coverage of construction activity and the items included in the creation of the index. The authors of the research conclude that when developing construction price indices, the European Union member states are recommended to use international or national classifications, noting that national classification systems must be compatible with international classifications.