An environmental performance simulator, which is able to estimate energy consumption and CO2 emission of detached houses and cities, is under development. To evaluate environmental performance of houses and cities, the reference model is required as the standard of energy consumption and CO2 emission because houses have huge variety of conditions. Three types of generic houses in Japan (wooden structure) are researched for setting the reference model of houses. The throughputs, which define the environmental load deference between the reference model and the objective one, are calculated from five constructions. In the city scale, the throughputs of Fukuoka city and Kitakyushu city are evaluated using two energy saving scenario.
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