This article discusses the system of construction control of capital construction objects, its participants and their interaction. Purpose: analysis of the building control system, interaction of its participants, determination of the main factors influencing the functioning of the building control system. Methods: the method of synthesis and scientific analysis was used. Results: the authors identified the main factors influencing the efficiency of the construction control system. Conclusions: the identified main factors provoke a decrease in the efficiency of the construction control system. The prospect of the study is further analysis of the factors to find their elimination.

Keywords: construction control system, interaction of participants, factors