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Abstract:The block type and structural systems in buildings affect the amount of building materials required as well as the CO 2 emissions that occur throughout the building life cycle (LCCO 2 ). The purpose of this study was to assess the life cycle CO 2 emissions when an apartment housing with 'flat-type' blocks (the reference case) was replaced with more sustainable 'T-type' blocks with fewer CO 2 emissions (the alternative case) maintaining the same total floor area. The quantity of building materials used and building energy simulations were analyzed for each block type using building information modeling techniques, and improvements in LCCO 2 emission were calculated by considering high-strength concrete alternatives. By changing the bearing wall system of the 'flat-type' block to the 'column and beam' system of the 'T-type' block, LCCO 2 emissions of the alternative case were 4299 kg-CO 2 /m 2 , of which 26% was at the construction stage, 73% was as the operational stage and 1% was at the dismantling and disposal stage. These total LCCO 2 emissions were 30% less than the reference case.