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Remodeling for an aged building is emerging as a potential alternative toward a long service life of the building. However, unsuitable remodeling which does not review important factors on the remodeling causes to inefficiency in view of LCC. Some elements, components and/or equipments of an aged building were seriously deteriorated for its' age because of the poor maintenance and operation for them. Therefore, it is demanded for remodeling at the right way and process to lengthen the service life of the aged buildings.The purpose of this study is to suggest a decision procedure and method for a priority of remodeling. The procedure and method lead the required remodeling for a deteriorated building to be carried out reasonably within the budget. The primary factors critical to the priority decision making of the remodeling are obtained through the literature review, survey with relevant experts, and so on. Selected factors are 'importance degree of a remodeling activity', 'deteriorated level of the remodeling activity', and 'user's(or dweller's) priority requirement of remodeling'. The priority decision making for remodeling begins with breakdown the whole remodeling works into activities, and then multiply each other by current degree or level of the above mentioned 3 factors for every remodeling activities. The activity having the least score is the first candidate for remodeling.