The need to communicate is one of the most important human requirements, which the designer seeks to provide its means in interior and exterior spaces, by providing the designed environment the capability for people to meet individually or groups, including designed spaces for movement, gathering and sitting with special characteristics such as providing adequate lighting, audio processors to improve sound quality and noise prevention, The study emphasizes that participatory design is the power of change in the creation and management of communities for people by an analytical descriptive Method: based on gathering information to build the theoretical framework and the analysis of two examples in Cairo – Egypt, where its strength lies in a movement that transcends traditional professional boundaries and cultures. Its roots lie in the ideals of participatory democracy where residents' decision-making is highly decentralized in all sectors of the society, So that all individuals learn the skills of participation and can participate effectively in different ways in making all the decisions that affect them and their lives, where interior designers and architects who facilitate the design process are described as "design colleagues" with benefits such as creating spaces that allow for social interaction and the development of a sense of community through direct interactions and community values. Objective: to discuss the community interaction between users and citizens of a residential community toward the space around them, and how this interaction leads to an innovative design that meets social needs, and consolidate social values which revitalize the identity of the Egyptian community to become a symbol for a sustainable residential community that supports the interior urbanism fabric, also adding a vibrant, liveable atmosphere to the residential community intended to this study. Conclusion: Interior Urbanism and population development processes involve all stakeholders in identifying priority issues and needs to take the necessary decisions and implement them, by participatory design which is one of the design approaches that engages the user in the design process to help effectively use the product and realize the real needs of users. Community participation leads to mobilizing the energies of citizens in the local community to contribute the challenges of human development. Strengthen the link between people and social projects that serve their interests and expand the scope of services.