The requirement for environmentally friendly methods of construction has increased the demand for regionally customized rating systems. In Oman, the prevailing use of the LEED rating system has shown limitations in addressing the unique economic, environmental and social needs of the country. This study introduces the utilization of Omani Developed Sustainability Rating System (ODRS) as a more accurate and contextually relevant tool for evaluating the current sustainability practice of construction projects in Oman. Through a comprehensive evaluation of 25 case studies encompassing governmental, semigovernmental, and private projects, this research highlights the varying acceptance and effectiveness of sustainable practices across different financial ranges and project types. The findings indicate that projects with higher budgets, such as the PDO Ras Al Hamra housing project (sustainability rate of 81%) and the OAAM project of Royal Court Affairs (sustainability rate of 88%), achieved superior sustainability scores compared to smaller, private projects and some governmental projects. A mixed-method approach combining quantitative analysis and qualitative stakeholder interviews was employed. Quantitative data were analyzed using R Studio software to evaluate sustainability indicators, while interviews provided insights into specific risk factors and challenges faced by stakeholders. The study also identified barriers that hinders sustainable construction, including waste management, resource efficiency, regulatory constraints, and economic priorities. The comparison between LEED certified projects and (ODRS) scores for the same projects underscored the discrepancies in sustainability assessments to approximately (10-15%), emphasizing the need for a localized system. The ODRS was shown to offer a more accurate reflection of Oman's sustainability criteria, driving more relevant and impactful sustainability initiatives. This research concludes that while the ODRS provides a robust framework for sustainability assessment in Oman, further enhancements are necessary. Recommendations include expanding stakeholder engagement, increasing the diversity of case studies, and implementing continuous monitoring and evaluation of the ODRS. Addressing these aspects can significantly advance sustainable construction practices in Oman, ensuring alignment with the country's specific needs and fostering a more resilient built environment.