Comparing Project Performance of Design-Build and Design-Bid-Build Methods for Large-sized Public Apartment Housing Projects in Korea

The project delivery method has a great impact on project performance and construction quality. The numerous studies on the project performance of the two project delivery methods, design-bid-build (DBB) and design-build (DB), have found differing results depending on the project locations, the project types, and the project sizes. Since no previous studies have been conducted with regard to large-sized apartment housing projects, this paper presents the comparative analysis results for the project performance of the DB and DBB methods, focusing on the large-sized public apartment housing projects built in Korea. The project performances considered include cost, cost growth, construction duration, construction duration growth, and quality performance. The cost and schedule performance analysis results show that the cost growth of the DB method is about 5% lower than that of the DBB method and the construction duration is shortened by twelve days per floor. The quality performance analysis results demonstrate that the satisfaction with the DB method is higher in terms of the construction quality and efficiency of the DB method. This paper contributes to the growing body of research into the efficiency of project delivery methods, expanding the body of knowledge for large-sized public apartment housing projects.