Sources and Causes of Material Waste and Effect of Material Waste on Cost Overrun in the Construction Industry: A Case Study

摘要

This research work studies the sources and causes of Material Waste and effect on Cost Overrunat preconstruction and construction phases of abuilding projecton some selected Construction companies inNigeria. The Relative Importance Index (RII) method was employed to analyse the primary data gotten from theresponses to the structured questionnaires sent to the respective selected construction companies. From thefindings, last minute client requirement was ranked highest as the factor that leads to design variation withrelative importance index value of 3.97; cost of construction materials was ranked highest as a factor thataffects selection of construction materials with relative importance index value of 4.05.