The purpose of this study is to suggest a method to improve the current building construction change order process, which has been a major cause of inefficiency and cost increases. Due to the non-standardized nature of design and construction projects, it is inevitable that design changes will occur frequently. Through a case study, the reasons for design changes and the elements of such changes were derived. Using the suggested assessment techniques, an objective and reasonable approach to design changes can be realized to support the design and construction process.