Project delays are a problem that often occurs in various types of projects, especially construction projects, and have a significant impact on increasing costs, decreasing quality, and stakeholder dissatisfaction. One factor that often contributes to project delays is the design aspect, whether related to completeness, quality, or design changes during the implementation stage. This research aims to comprehensively examine the role of design in project delays based on findings in the scientific literature. The method used is a literature review by examining relevant national and international journal articles, published within the last ten years, and obtained through reputable scientific databases. The study process was carried out through the stages of identification, selection and literature analysis to group design factors that contributed to project delays. The results of the study show that project delays are largely influenced by design problems such as incomplete planning documents, design errors, weak design coordination between disciplines, and design changes that occur during the construction stage. These factors have implications for rework, work flow disruptions, and adjustments to project schedules. The conclusion of this research confirms that design has a strategic role in determining project time performance, so that improving the quality of the planning process and design coordination from the early stages of the project is key in minimizing the risk of delays.