Project management (PM) has been a demanding profession in construction industry due to its dynamic nature originating from the uncertainties in budget, technology, and development processes, which put emphasis on the necessity for highly capable project managers. This study develops an extensive PM success model and investigates the influence of project manager’s competencies on the PM success. The resulting model reveals that the project manager’s competencies can play a big role in determining the PM success in construction projects. Leadership is identified as the most influential project manager competency followed by responsibility and commitment. Researchers and senior industry practitioners such as managers or boards of directors are expected to benefit from the developed model by recognizing the influences of project managers on the PM success and taking notice of the recommendations provided.