Construction sectors play a major role in developing Egyptian country; moreover the cost is the keyword at the construction cycle. This study presents the basis of implementation of Value Engineering (VE) at each stage that can be used to reduce the total cost for the construction project. Value Engineering improves the product cost by reducing the unnecessary costs associated with the product. In this paper Value engineering processes have been explained, on the other hand a case study for constructing the Greater Cairo Metro (Line 3–Phase 3) has been discussed and an analysis has been done by this process to reach the final optimization. In December 2016, The contractor signed contract with the client at the same prices of the previous phase which issued in 2013, so that he try to implement Value engineering technique to reduce the cost of execution phase considering the same function of the project. The application of VE is must be done parallel with respecting and checking if there any obstacles for the new design which may affect the routes of other activities like (MEP works, rails activity or mechanical works). This condition will be clear if the tool like Building Information Modeling technique (BIM) is used which is the one of its main function to preview any clash might happened with different activities. At the final, it is concluded that the cost decreased by 23% of the total price of typical slabs and 1.7% of the overall contract amount without changing the basic purposes of the element.