The research aims to study the causes and magnitude of wastage of construction materials on construction projects sites in Jordan. To achieve the research aim, the researcher had prepared a questionnaire form included questions about the causes of wastage and the estimated percentages of wastage of ten most popular kinds of materials used on construction sites in Jordan. Prior to the final formulation of the questionnaire form, a pilot survey was conducted. The form was revised in accordance with the feedback received. The number of causes adopted was 60 distributed on the six major categories. The form was distributed to 240 participants (clients, contractors, and consultants). The study revealed that the most important causes of wastage of materials on construction sites in Jordan are frequent design and client’s changes; rework due to workers mistakes; poor contract documents; wrong and lack of storage of materials; poor strategy for waste minimization; shortage and lack of experience of skilled workers; poor site conditions; damage during transportation; theft and vandalism; and mistakes in quantity surveying and over allowance. In addition the study concluded that the percentage of wastage materials is accounted for by values between 15% and 21% on Jordanian construction sites. 1. The Objective of the Research The objective of the research is to identify the major causes of material waste on construction sites in Jordan based on the opinion of contractors, consultants, and owners also to assess the quantities of wastage in main building materials used in the Jordanian construction sites and making comparison with the other countries. 2. The Construction Industry in Jordan Jordan is considered one of the most stabled countries in the Middle East, attracting considerable amounts of investments from surrounding countries. The construction sector has been one of the most active sectors of the Jordanian economy lately. Construction sector accounted for 4.4% of the Gross Domestic Product (GDP) on average over the period 2008–2010. The sector has grown at a Compound Annual Growth Rate (CAGR) of 13.7% during the same period. Credit to the construction sector has also expanded by a CAGR of 20.5%, with the highest growth rates of 34.3% and 24.4% registered for 2009 and 2010, respectively [1]. Construction materials costs are going through a period of price increase for almost all variety of construction materials. In a study carried out by the Ministry of Housing and Reconstruction in Jordan [2], it is found that this increase for the period 2010 to 2012 is
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