GMP Calculation Process in CM at Risk for Public Construction Project

공공 건설사업 CM at Risk 적용시 GMP 산출 프로세스

  • 김건성 (서울시립대학교 건축공학과) ;
  • 김정훈 (한국건설기술연구원 공사비원가관리센터) ;
  • 현창택 (서울시립대학교 건축공학과)
  • Published : 2020.06.12

Abstract

Recently the diversification of construction market and the continuous reduction of construction amount are raising the need of alternative delivery method in the construction industry. The foreign advanced companies actively adopted the CM at Risk delivery method where they perform the service of agent CM in the design phase, and agree GMP(Guaranteed Maximum Price) with the client at the time of 50~80% completion of design. Even in Korea they began to apply that method to pilot projects. In CM at Risk, through the early participation of builder, the level of design completion can be improved and the change order and construction period delay can be minimized. On the other hand, GMP is usually calculated when the design is about 80% complete, so there is uncertainty in the construction cost. Therefore, in this research, the increased amounts of construction cost are analyzed in a number of public construction projects, and GMP calculation process is proposed using the analysis results and CBR(Case-Based Reasoning) technique to reduce the construction cost increase in the construction phase.

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