Impact of Reworks on Project Delivery in the Nigerian Construction Industry

Abstract

Rework may be induced either by errors or omission made during the design or as a result of poor workmanship at the construction stage. This research paper focuses on the effect of reworks on project time and cost in some selected building projects in Nigeria. A research schedule was designed and self administered along with structured questionnaires to professionals involved in those projects (25 building projects) to access the cost data of the selected projects and as well identify the influencing factors that are responsible for cost and time overrun as a result of rework. Analysis of the cost data was done using simple percentile table to identify projects that experience overruns and also analysis of the response from professionals was also carried out using relative importance index to identify factors leading to cost and time overruns as a result of rework. The findings revealed that some projects having cost overrun as high as 9.88% and 37.88% in the case of time overruns, and rework cost on average for the entire projects considered was 3.466%. The entire participants in the industry agreed that the most prominent effect of rework on projects is time and cost overruns, followed by quality.