Cause of Defects, Cost of Correction and Guideline to Prevent the Recurrence of Defects in Construction: Case Study of a Hotel Construction

Abstract

The purpose of this research was to study and analyze the defect data of architectural and interior works of a hotel located in Bangkok, Thailand as a studied project during final inspection and handing over processes. The researcher used database from computer software called “FINALCAD” which has been keeping the quantities, types, locations as well as issued dates and closed dates of all defects in the focused project. In-depth data analysis with various assumptions had been undertaken in the research in purpose of obtaining significant factors that could show main causes of defects and preventions of defect’s recurrence. Cost and Time of rectification were also considered in order to recognize approximated costs and delays of rework. The research has found that “Less of supervision”, “Improper sequence of works” and “Workers have no skill” are 3-main causes of defects, 7.87 days were delayed from 30 days normal working time due to occurrence of defective works and 2.50% of contract price is cost of defect’s rectification. Additionally, 3-key factors to prevent recurrence of defects in studied project consisting of “Control sequence of works”, “More supervision” and “Improve inspection process”. Researcher hope that   the result of this research can be applied to improve project quality and prevent defect’s recurrence in other similar projects.