The construction industry in Egypt faces numerous challenges that demand effective leadership and cohesive teamwork to ensure project success. Multiple studies have emphasized the substantial significance and influence of construction on the Egyptian economy in many aspects. Recently, teamwork quality and leadership style have been the focus of many studies because of their pivotal role in the project’s success. This study investigates the impact of transformational leadership on project success, with a particular focus on the mediating role of teamwork quality. Drawing on existing literature, which underscores the significant impact of leadership styles on organizational outcomes, this research extends these findings to the construction field. The empirical study conducted to test the hypotheses regarding the effect of transformational leadership on project success with the mediating effect of TWQ using data from 357 professional team members in the construction industry in Egypt demonstrates that transformational leadership has a strong direct effect on project success. Moreover, the quality of teamwork acts as a critical mediator, further enhancing project outcomes. The results indicate that transformational leadership not only directly contributes to project success but also indirectly affects the fostering of high-quality teamwork. These findings provide valuable insights for construction industry practitioners and highlight the importance of adopting transformational leadership practices to achieve superior project performance. This study advises companies in the construction sector in Egypt to enhance the leadership styles of project managers to achieve optimal project outcomes and improve the cooperation quality of project teams.

Transformational leadership, Teamwork quality, Project success, construction, Egypt