PT Deltamas Surya Indah Mulia just launched “Customer Delight” project on the previous year on 2017. The aim of that project is to improve customer satisfaction by giving good service quality. They believe that service quality is important because it can increase customer satisfaction which will result in higher sales. The purpose of this research is to reveal and analyse the impact of service quality towards customer satisfaction at PT Deltamas Surya Indah Mulia. The research is done with quantitative approach. The population and sample in this research are the customers of PT Deltamas Surya Indah Mulia. The analysis methods used are validity test, reliability test, normality test, linearity test, linear regression test, correlation test, determination test and hypothesis testing with z-test.