It is the task of architects and engineers to optimize the life cycle costs of buildings. The result of this work is a comprehensive risk management system that includes tools, forecasting, and decision models for practical application, which allow for the early identification, measurement, assessment, management, and verification of usage cost risks. The application of these tools and models through practical examples provides assistance for architects and engineers in planning. The developed risk management system thus contributes to optimizing the economic efficiency throughout the entire life cycle of residential buildings, particularly well before the construction activity begins.