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Unreasonable planned duration and cost often cause different contract disputes, such as project overdue and contractor bankruptcy, which make the project unable to be completed within as-planned schedule and with anticipated quality and consequently result in financial losses to multiple contract parties. Previous researches mainly focused on dealing with duration and cost estimates for new construction projects. There are limited researches related to historic building restoration projects, which have attempted to address the issues of productivity and cost estimate for some types (i.e., traditional temples) of historic buildings. This study found that there is no approach to forecast project duration and cost for historic building restoration in its early stage, which results in the situations of budget and schedule planning and control being problematic. Based on the investigation reports and construction records from the “Rehabilitation or Reuse Plan” and “Work Report” in past historic building restoration projects (only temples and houses are investigated), this study collected key project features and performed statistical analysis to figure out key variables for forecasting project duration and cost. This study proposes a forecast model that uses the restoration area of historic building restoration project as a variable in a regression-based forecast model to produce a reasonable duration and cost quickly. The main contribution of this study is to develop a reliable duration and cost forecast model that can generate reasonable duration and cost. The developed model is a convenient approach, with which even non-engineering background personnel can use it easily.
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