Design Criteria-Based Probabilistic Estimation Method for Aged Apartment Remodeling Projects in Korea

As apartment get older, it is required to extend the life of the buildings through remodeling and reconstruction. In this situation, members of the apartment choose one of two options. The most important thing in this choice is economical feasibility, which is greatly influenced by the construction cost. There are many cases of reconstruction projects, and accurate construction cost can be calculated. However, remodeling projects are very rare and it is difficult to calculate accurate construction cost. In addition, the remodeling is not only difficult for the members to communicate the design criteria to contractors, but also takes time to reflect them in the estimation, which also affects the decision making. Therefore, this study proposes an estimation method that can integrate the design criteria with in cost. To do this, this study analyzes design criteria based on the previous remodeling cases and classifies them to derive Design Criteria that are required by the members. And it also proposes a range of construction cost by introducing range estimation process to measure the effect of construction cost on each design criterion. In conclusion, this study has been developed an easy-to-use estimation program by combining Excel and Sketchup software. If remodeling cases accumulate in the future, the accuracy and usability of the program are expected to increase. © 2019 The Authors. Published by Budapest University of Technology and Economics & Diamond Congress Ltd. Peer-review under responsibility of the scientific committee of the Creative Construction Conference 2019.