The stages of pre-project and design preparation are fundamental for the further implementation of the investment and construction project. The success of construction and commissioning of facilities depends on the successful completion of these stages. The duration of the stages depends on the competence and consistency of interaction between the participants in the investment and construction project, the rationality of decision-making by the technical customer (developer) and a number of other factors. Identifying factors and finding options for rational planning of the stages of pre-project and design preparation is very relevant. As part of the study, a formula was derived for determining the duration of the stages of pre-design and design preparation of objects for construction, taking into account the influence of negative factors. The results of the study are used in planning the stages of pre-design and design preparation of a facility for construction.

Keywords: factors, stages of pre-project and design preparation of objects for construction, duration of procedures