The article contains substantiation of the need for investment and construction projects in various sectors of the construction production. On the basis of domestic and foreign experience it describes the concept of the client (customer) and his functions and tasks in the implementation of such projects. It also systematizes the main stages of the customer's activities, which are presented as a preparation for the construction, development of construction sites, monitoring the progress of the

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... nstruction, commis-sioning and commissioning of facilities. There is also a determination of time intervals at each stage, the final formula for calculating the duration of the investment project due to the given the shared stages. The article also gives optimization variants in some sectors of construction production.