The number of construction service companies spread across Indonesia requires a construction service company to have the right strategy to survive amid a large number of other construction service companies. This research discusses how a marketing mix strategy can achieve a company's competitive advantage. The methodology used in this research is qualitative using data collection techniques through interviews, observations, and documentation related to the research. The results of this study explain the marketing mix strategy at PT. Intishar Berkah Globalindo is by always maintains product quality standards, serving their consumers by communicating all forms of constraints and agreements that exist, promoting through direct marketing, lowering experts, having a company profile to attract clients, involving their clients in determining the quality of raw materials to match the agreed costs and the company's current location is used as the administrative center of PT. Intishar Berkah Globalindo. To get a client of PT. Intishar Berkah Globalindo will participate in the auction and compete with other construction service companies. The use of the right experts is also very important so that the resulting product can be following the wishes of consumers. Timely workmanship and cost accuracy are the competitive advantages owned by PT. Intishar Berkah Globalindo.