Currently investment and construction activities are based on the implementation of development projects. As any project’s success heavily depends on joint efforts of a project team members, there is an urgent need for a motivation system able to stimulate team members’ result-orientation and satisfy their individual needs. The Project Management Body of Knowledge (PMBOK) methodology is suggested as a basis for building a sound development team motivation system, with its motivational tools correlating to stages of project management. The purpose of this article is to build methodical approach to system of motivation of the development project team. The methodological approach is formed taking into account the correspondence of the goal and the type of motivation depending on the stage of project management, as well as on the basis of the principles of forming the motivation system of the project team. The result is a constructed conceptual model for the development of a motivation system for the development project team based on the principles of PMBOK. Methods of comparative, empirical, system and economic analysis were used to substantiate the propositions put forward in the article.