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Buying a house for personal use is an infrequent investment for most people because of the high sales cost. Most buyers only make one housing purchase in their lives, most often for personal use. Real estate developers evaluate decisions for housing development projects often according to market- and sales-oriented factors. In addition to the fact that the industry involves fierce competition, real estate developers frequently neglect using healthy building materials and comfortable interior designs, focusing instead on a luxurious building facade to attract customers and the use of high-quality imported materials in the common spaces inside the building. To identify the factors affecting the comfort of living in houses and satisfy customer demands, this study combined three decision theories, Delphi method, the analytical hierarchy process and utility theory, to develop a customer health-oriented housing comfort assessment model. This model can be used to assess and compare the quality of living of various houses, providing housing agents with an evaluation tool that accounts for both sales and customer health that can be used in the evaluation process before a house is introduced to customers. Thus, the effectiveness of decision-making can be improved and the risk of investment reduced.
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