In the context of Primavera P6 implementation, this research integrates lean construction principles into schedule optimization techniques. The study explores lean methodologies such as Time delivery, pull planning, and continuous improvement in reducing waste, improving workflow reliability, and improving project timelines compression when incorporated into the scheduling platform. The analysis was performed, and it was found that the systematic application of lean construction principles in Primavera P6 will greatly improve project schedule adherence, resource utilization, and project delivery performance. Construction firms that do lean and the right kind of advanced scheduling successfully merge the two and get measurably better results in meeting their deadlines and using their resources efficiently.