With a steady global increase in urban stressors, and the effects of global warming and climate change such as adverse weather events and natural disasters, urban communities worldwide need to grow stronger rapidly. Strong networks and social cohesion mean that communities and the individuals that constitute them are better able to cooperate and take actions to support each other. People who feel invested in the place where they live may be more likely to care for it, and be motivated to take action when it is affected by a negative environment event. These acts are in addition to the services and support provided by formal authorities. This report explores the relationship between urban built environments and “pro-community” behaviours and psychological responses: positive acts and states of mind beneficial to communities and their constituent individuals. Its context is both urban development projects and frameworks (13) and natural disaster contexts (4) in 12 countries in the global north and south. Its core argument is that built environments planned, designed, built, located, and managed with social interaction in mind can support pro-community behaviours which contribute to communities’ daily social sustainability, and help strengthen their resilience to unplanned environmental adversities.