Recently, the sustainable buildings are stirring up great interests as the efficient energy saving and reduction of CO2 emission plan for the preservation of earth environment. Sustainable building technologies, which realizes sustainable buildings, generally shares the life cycle with buildings, and saves operation costs by reducing energy consumption and CO2 emission that are occurring at the operation stage of buildings. Accordingly, the economical efficiency evaluation of sustainable building technologies shall be analyzed in proportion to the saved costs through environment performance of sustainable building technologies during the life cycle of building. As this study presents the concrete evaluation method of economical efficiency using LCC Analysis, in which environment cost is considered, it is expected that the sustainable building technologies may be utilized at the time point of building design.