In order to develop a sustainable society; it is necessary to assess environmental loads such as CO2 and NOX emissions, and the use of natural resources. The Life Cycle Assessment (LCA) can provide useful information for decision-making purposes in order to solve this problem. In this paper, we focus on the analysis only, using an input-output table. The housing types assessed were apartments, terraced houses, semidetached houses, detached houses and so on. We found that the main source of CO2 emissions during the construction phase came from building structures, foundations or finishes. Finally, methods for the reduction of CO2 emissions during the construction phase and operation phase were discussed.