Promotion and provision of information on subsidized housing for low-income communities (MBR) is still carried out conventionally, such as throught brochures, banners or exhibitions. This method is considered less effective in reaching the wider community, especially the younger generation who are more familiar with digital technology. This research aims to design and create a web-based information system for sales promotion of subsidized housing at Mutiara Gerden Housing. This system is expected to increase the attractiveness and trust of potential buyers towards the products offered, as well as help developers in conveying information more quickly, widely and interactively. This research uses the waterfall method which includes problem identification, problem analysis, goal determination, literature study, data collection (observation, interviews, dan document study), system design including problem analysis, design, coding, and testing. System implementation is carried out after the design is completed, followed by testing using the black box method to ensure functionality and error handing. The programming lannguages used are HTML and PHP for web services, and MySQL as the database. System design also utilized the Unified Modeling Language (UML) with diagrams such as use case diagrams, and activity diagrams. The result of thir research is a web-based subsidized housing sales, promotion information system application thet helps promote houses in Mutiara Garden Housing. This application includes a login page for accesing the system, a product deatil page for complete information, a product booking page for unit reservations, and a home menu for a product overview. This system is expected to make it easir for employees to promote homes more effectively and efficiently.