The advantages and disadvantages of combining independent companies into holding structures, as well as individual components of the synergy effect, are disclosed. The possibility and features of applying the method of assessing the value of companies based on the net increase in invested capital to a group of construction companies are shown. The financial condition of individual companies and the group as a whole is analyzed, and the features of the preparation of consolidated financial statements when combining construction companies related to production and financial relationships into a group are identified. Variable cost calculations were performed, the main factors influencing the resulting cost of capital indicator were identified, and it was shown that the indicators characterizing the market situation in the construction industry have the greatest impact on the cost of this group. Based on the analysis of the value of the group and independent companies, recommendations are made for making decisions on the reorganization of the group, taking into account possible options for changing the market situation in the construction industry. It is shown that the merger of companies into a group does not lead to an automatic increase in value, since it is necessary to take into account a number of indicators that affect it, such as indicators that characterize the financial relationships between the group companies, as well as the profitability of external construction contracts.