Project uniqueness and high degree of customization have always been a challenging aspect of construction projects and many related operations . This paper describes the simulation of a production line in a kitchen cabinet manufacturing facility that was carried out with the aim of better understanding and improving the production process. Discrete event simulation (DES) using Simphony.NET, a simulation modeling tool developed at the University of Alberta, is used to investigate and analyze an existing facility process to increase manufacturing productivity, reduce work-inprogress, and decrease idle time. The cabinet manufacturing company in the presented study operates different production lines, produces different product types, and uses varying materials. In the case study, specifically, the simulation tool is used to explore the challenges associated with increasing production to satisfy the rising demand of customized products. The result of the simulation study provides valuable information to achieve this goal.