Purpose: This investigation aims to explore the influences of project success in construction company settings, particularly focusing on the related role of project management innovation, project governance, support mechanisms, and technical complexity. This study aims to fill the existing gap in already conducted research, by implementing a comprehensive approach to incorporate these variables and find out their collective impact. Method: A careful methodological approach is used to conduct this research, by utilizing 232 employees of construction sites of the Kingdom of Saudi Arabia. The scales used in this research are adopted, which confirms the reliability and validity of the instruments, while STATA-SEM is used as an analysis tool. Findings: The findings show that project governance and technical complexity, have a direct influence on project success, additionally, project management innovation is found to be an important mediator, while project management support acts as a moderator forming the relationship among the variables. Thus, fruitful understanding can be grasped from this insightful project management dynamics in the construction industry. Implications: A contribution is added to the theoretical concept by providing the momentous role of mediating and moderating variables in understanding project success contributors. Moreover, it addresses past gaps by examining these relationships within the construction industry, particularly in a unique cultural and industrial context. The study’s significance lies in its potential to provide actionable insights for practitioners, guiding decision-making and optimizing project management practices within the construction sector.