Delay is one of the most common issues in construction industry worldwide associated with imposing additional costs upon parties involved in projects. Likewise, majority of construction projects are suffering from time extensions. This study aims to investigate the main causes and effects of delay in Iranian construction projects. A comprehensive literature review conducted during this research identified 32 causes and 6 corresponding effects. Factors contributing to delay were further classified into five categories namely project-related, site-related, client-related, contractor-related and consultant-related. Results of this study are based on a well-structured questionnaire distributed within 230 construction project professionals. The results of the survey demonstrated that the main five causes of time overrun were ‘delay in payment to contractor/supplier’, ‘alteration in project scope’, ‘problems with neighbors’ lands’, ‘delay in preparation and approval of drawings’ and, ‘financial constraints of contractors’. Furthermore, cost overrun, time overrun, and dispute were recognized by the respondents as the three most important effects of delay.Current Output:Publication (In Process)
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