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Nowadays, remodeling has been understood as a countermeasure to improve indiscriminate construction behavior in the aspect of environment and economy. Remodeling is able to retrench the resources and costs consumed in construction and the wastes from demolition of building. On the other hand, remodeling makes negative impacts from misunderstanding for the concept of remodeling. For reasons mentioned above, this study took the two-pronged approach consisting of the examination of the existing remodeling construction data of office buildings from the five domestic remodeling companies and the survey of the concerned departments and the employees at the architect's offices. The research content mainly included the demand cycle of remodeling, the type and scope of remodeling construction, analysis of construction costs, and problems in construction. Further, the environmental impacts from construction were quantified by Life Cycle Assesment.