Despite negative perspectives on their consequences, GATED communities continue to spread in cities for structural reasons such as globalization and economic neo-liberalism. Hence, there is a need to find a way of achieving a better balance between these and social factors to make these communities more livable. Together with economic market perspectives, livability principles might offer a solution for mediating the social consequences of GATED communities. This research aimed to examine the physical factors influencing social livability of GATED communities and identify the degree of their prominence. To collect the data, four GATED communities in Tehran were selected through cluster sampling. An analysis of 258 questionnaires and observation of the physical features of the GATED communities indicated five physical features affecting social livability of GATED communities. The results showed that mixed uses had the biggest effect on the social livability of GATED communities followed by mixed housing, accessibility, walkability and sociability respectively. Although it might be impossible to put a halt to the expansion of GATED communities in the short run, attempts can be made to attract different classes of people to these communities through mixing different uses and prevent from the fragmentation of GATED communities. Well-connected and walkable streets help many daily activities occur within walking distance promoting the security of the neighborhood. Designing sociable public places where everyone is welcomed without any type of exclusion or limitation increases social bonds within GATED communities which in turn promotes resident’ s sense of community.