Infrastructural development projects including road projects are key in improving living standards of a nation and ensuring economic growth. However, despite the increase in number of road construction projects over the years, a good number have been portraying poor sustainability as well as cost and time overrun. Even though, participatory project design is considered an important phase of a project, most project managers do not consider the participation of the stakeholders in project design as an important aspect. This paper analyzes the influence of participatory project design on sustainability of road construction projects. The study specifically sought to determine the influence of participatory goal setting, participatory resource planning and participatory project scheduling influences and sustainability of road construction projects. The study was anchored on System theory and Stakeholder theory. The findings indicated that participatory project design has an influence on sustainability of road construction projects. Specifically, the study found that participatory goal setting has a significant influence on sustainability of road construction projects. The participation of stakeholders in needs assessment, development of objectives and identification of indicators leads to an improvement in the sustainability of road construction projects. In addition, the study found that participatory resource planning has a significant influence on sustainability of road construction projects. This implies that the participation of stakeholders in identification of resource requirements, resource mobilization and resource allocation/budgeting has a significant influence on sustainability of road construction projects. Also, the study established that participatory project scheduling has a significant influence on sustainability of road construction projects. This shows that the participation of stakeholders in identification of tasks, prioritization of tasks and task duration estimation has a significant influence on sustainability of road construction projects.