This research is based on the questionnaire survey of residents in remodeled detached houses that were built after 1981. Analyzing satisfaction and implementation details in terms of two aspects – different cost ranges of remodeling, and whether the remodeling projects had been carried out with / without enhanced thermal insulation – we found the following points.
First, from the analysis of difference according the cost ranges, three points become clear: 1) regardless of the cost ranges, many respondents carried out remodeling triggered by “turning point of repairing” or “aged deterioration or breakdown of facilities”, on the other hand, the percentage of people who triggered by “changes in family structure and life stage” grows in higher cost ranges; 2) remodeling contents are not often added to the initial considerations, but the final cost often exceeds the initial budget, especially for high-priced remodeling; 3) the group that carried out high-priced remodeling had been dissatisfied with the housing performance before the remodeling, and the importance at remodeling was high for many items of housing performance. Furthermore, after remodeling, the degree of satisfaction was increased. It is considered that they are realizing the improvement effect by remodeling.
Second, from the analysis of remodeling with / without enhanced thermal insulation, the three points become clear: 1) About 20% of the group that carried out enhanced thermal insulation added “enhancing heat insulation of windows or frames” to the initial considerations, based on their own requests during the process or on proposal from their contractor. The amount of cost increase compared to initial budget is also larger than the group that didn’t carry out enhanced thermal insulation; 2) the group that carried out enhanced thermal insulation had been dissatisfied with the thermal / energy performance before the remodeling, and the importance at remodeling was high. After remodeling, the degree of satisfaction was increased, especially in “warmth in winter”. It is considered that they are realizing the improvement of thermal environment by remodeling; 3) more than 20% of the group that didn’t carry out enhanced thermal insulation is eager to carry out “enhancing heat insulation of windows or frames” in the future. In addition, after remodeling, there are a certain number of respondents who are dissatisfied with thermal environment in winter, and we have concluded that their motivation of thermal insulation remodeling can be improved by appropriate suggestions.
In order to promote the implementation of thermal insulation remodeling in the future, an information provision method that encourages proactive proposals by contractors is necessary.
