Reduction in project implementations is one of the most important challenges in construction management. In our country, after the revolution, there has been a significant leap forward in the construction of national civilization projects. However, despite the increase in the number of projects being implemented or commissioned, the problem facing these types of projects is the lack of start-ups and their operation on time according to the schedule. These delays also increase the cost of construction and reduce their quality. Comprehensive Quality Management (TQM) is the process by which management, with the participation of employees, customers and creditors, continuously improves quality. In other words, the final product in any industry must be tailored to the standards required by that industry to bring customer satisfaction. The construction industry is not an exception to this rule, and even the high cost of construction in this industry makes it necessary to ensure the control of the final product more than other industries. On the other hand, one of the goals and perspectives of TQM is to satisfy the customer completely with the least cost and attention to the optimal point of life cycle costs. In some cases, it increases so much that it takes the plan out of the being economic. In this article, while defining the basic topics of management, it deals with the role and position of time management, in the occurrence of delays and providing appropriate solutions to solve them. The aim of this study was to investigate the effect of quality management on optimal changes in construction costs for the construction projects.