The article reveals the interaction system features of construction companies, substantiates the need to introduce special management means into the organizational and management practice of construction companies, which include management consulting. The features of management consulting, its methodology and methods are considered. The author’s approach to the formation of managerial decisions in the system of interactions between construction companies, focused on the implementation of the principle of joining internal and external consultants’ efforts within the framework of combined consulting, is stated. It is shown that combined consulting acts as universal mean that provides a full suite of services in management, creating preconditions for the successful implementation of the principles of the concept of interaction in the management of construction companies, and is the most important factor that activates the construction companies’ interaction with the subjects of the regional investment and construction market.