Unlike building a new project, the maintenance and rehabilitation of an existing project are complex. The complexity is driven by different factors such as limited access to the site, limited working hours, restricted storage area, and a limited number of allowed crews to work simultaneously. Considering all these factors is essential for construction process planning. Hence, testing the maintenance project under different project scenarios will help to identify the optimum resources configuration. In this paper, we present a case study of a maintenance project located in Al Khodh, Oman. It is required to model and simulate the maintenance operation, given many client-based work constraints. The project was modeled using a Simphony simulation environment. The simulation model was tested in different resource configurations, including several floor accesses, different tiles breaking and tiles installation teams, and a different number of waterproofing teams. This study demonstrated that the tiles installation team is the most influencing resource in the project. Given one floor access at a time and using two tiles installation teams produces the most economical resources configuration. Three tiles installation teams are the best selection for two-floor accesses, and seven tiles installation teams are the best selection for three floors.