There were no cases of re-certification of school facilities until G-SEED ver.2016 because there were no separate criteria for re-certification of school facilities and no institutional guidelines. Therefore, it did not meet the purpose of the certification system, known as the sustainable development throughout buildings life cycle. The most important feature of the G-SEED ver.2016 is that the criteria are divided into those for new and existing buildings. Therefore, buildings assessed on new certificates can be recertified in accordance with the ‘G-SEED for Existing Buildings’ when their five-year certification expires. In this study, the users and managers of school facilities that acquired green building certification were investigated for a post-occupancy evaluation and on-site verification was conducted to verify the performance of eco-friendly buildings. The contents of the survey examined the perception of G-SEED and issues of satisfaction and maintenance in seven professional accreditation categories. This study aims to suggest improvements in the criteria for certification of the G-SEED for School Facility.