Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 54 2 2022 04 21 Cost overruns as significant factors affecting the sustainable management of building projects in Iran (The Causes of Cost Overruns) Cost overruns as significant factors affecting the sustainable management of building projects in Iran (The Causes of Cost Overruns) 413 434 4481 10.22060/ceej.2021.18877.6989 FA Omid Ilka Shahed University Mahdi Rojhani Civil Engineering Department, Engineering Faculty, Shahed University, Tehran, Iran 0000-0002-5220-5716 Journal Article 2020 08 20 The building industry is a large part of Iran's economy. A considerable amount of national resources, including energy and materials, are consumed in this sector. Therefore, the efficiency of this industry has an essential role in the sustainable development of the country. Cost overruns of construction projects or deviating from the budget is one of the most influential factors in reducing the efficiency of this industry and the occurrence of numerous problems in it. Therefore, identification of the causes of costs overruns is a significant factor in managing the cost of building projects. In this paper, a review of similar research was conducted and a long list of reasons for cost overruns was prepared. Then, the list was modified, completed and categorized based on the ecology of Iran's building industry. The list has been distributed as a questionnaire among 230 experts, and the severity and frequency of each factor were asked. Based on the obtained data, statistical analyzes such as ANOVA were performed. According to the results, inflation, project delay, bureaucracy, weak resource planning, and low efficiency and rework due to incorrect or non-integrated design in various fields are among the most critical factors causing cost overruns. The building industry is a large part of Iran's economy. A considerable amount of national resources, including energy and materials, are consumed in this sector. Therefore, the efficiency of this industry has an essential role in the sustainable development of the country. Cost overruns of construction projects or deviating from the budget is one of the most influential factors in reducing the efficiency of this industry and the occurrence of numerous problems in it. Therefore, identification of the causes of costs overruns is a significant factor in managing the cost of building projects. In this paper, a review of similar research was conducted and a long list of reasons for cost overruns was prepared. Then, the list was modified, completed and categorized based on the ecology of Iran's building industry. The list has been distributed as a questionnaire among 230 experts, and the severity and frequency of each factor were asked. Based on the obtained data, statistical analyzes such as ANOVA were performed. According to the results, inflation, project delay, bureaucracy, weak resource planning, and low efficiency and rework due to incorrect or non-integrated design in various fields are among the most critical factors causing cost overruns. https://ceej.aut.ac.ir/article_4481_6c530aae768250b8d9c3c908a13ee287.pdf