The realization of any investment project involves various types of risks, due to the presence of uncertainty in the economic activity of the enterprise. The reasons of occurrence risks are not the full amount of information about the future. Distinction between risks and uncertainty: for understand we should know what conception has risks. Risk-probability a risk event, but if the question is about uncertainty, we can’t determine the likelihood of associated events. What assessment methods exist today? The various methods of risks assessment in construction and investment projects we described in this article.