Purpose –This study aims to identify and assess the most important factors affecting the quality of construction projects in Lebanon before and after the economic crisis (in 2019), and to determine their impact on the cost overrun of the project. Design/Methodology/Approach –A quantitative statistical analysis was conducted to achieve the research objectives through a survey of 22 factors (distributed under 6 categories) filled out by 80 engineers working in the construction field. Collected data were used to rank and categorize these factors and to determine their impact on the cost overrun ...