The study examined the implementation and perceived effectiveness of various Agile principles in enhancing construction project time performance in the Nigerian construction industry. The results revealed that some principles, such as top management support and employee empowerment, co-located high-performing teams, test-driven development, collaborative development, and adaptive control, are moderately implemented and considered fairly effective. Top management support and employee empowerment were identified as crucial factors for successful Agile implementation. Co-located teams were found to enhance communication and collaboration, positively impacting project performance. Test-driven development practices help ensure the quality and functionality of construction projects. Collaborative development fosters innovation and improves project outcomes by encouraging teamwork and knowledge-sharing. Adaptive control allows project teams to respond and adapt to changing project requirements and conditions. The study adopted quantitative method in data collection and descriptive statistics in analysing the data. However, there is room for improvement in implementing some of the principles to further enhance project outcomes. The study indicates that the Nigerian construction industry has the potential to benefit from Agile implementation to improve project time performance. However, further research is needed to explore potential challenges and barriers to successful Agile adoption in the Nigerian context and propose strategies to overcome them. By embracing Agile methodologies and fostering a more adaptive and collaborative approach, the Nigerian construction industry can position itself for greater success in delivering projects on time, within budget, and meeting the expectations of all stakeholders involved.