The study is intended to analyze the tendency of the remodeling for the high schools in Seoul, with the potential challenges thereof, determining the principle for the remodeling projects in the days to come. To that end, the analysis to identify the school facilities in a bid to accommodate the current curriculum was conducted, along with the case study on remodeling projects. The $7^{th}$ curriculum demands for a significant change in school facilities. The number of student in a class that has been on the decline, despite of steady increase in number of schools, and the population getting concentrated in Seoul and its suburbs have resulted in an increase in number of class. Consequently, more investment in the facility, rather than improving a substantial education environment, has been made. The study, thus, is aimed at identifying the facility of the high school required by the $7^{th}$ curriculum, as well as implementing a fact-finding investigation into the remodeling works far high schools in Seoul so as to come up with the guideline for remodeling projects.