This literature review explores the causes and impacts of cost overruns in construction projects in Oman. It discusses various factors that contribute to cost overruns and delays, including poor project planning, change orders, inadequate resources, and lack of skilled personnel. The review also includes case studies of government projects in Oman that experienced cost overruns and provides insights into the reasons behind these overruns. Overall, this review highlights the importance of effective project management and planning to mitigate cost overruns in construction projects.