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Usually on-line construction information system for housing usually supports basic design type of houses and their estimating data. But they are fixed and far from the exact cost of construction. This study suggests a simple method to make an approximate estimating for steel-house, and it makes it possible to monitor the cost of change when some items are changed. This study also suggest the case study of approximate estimating which can show us accuracy of this method. This method can be a part on-line construction support system for a specific facility.