In many large cities today, spaces of extreme wealth and poverty often exist in proximity. City officials, private developers and wealthy residents often 'correct' this cheek-by-jowl situation of proximate yet drastically unequal communities by building physical walls and fences between them. What is the interface between spaces inside and outside the walls built around low-income communities in elite neighbourhoods? How do people living inside the walls built to contain their communities engage with this infrastructure of control? This article addresses these questions by presenting the politics of socio-spatial separation of a low-income and informally built walled community called France Colony in a wealthy neighbourhood in Islamabad (Pakistan). It shows how the wall around France Colony is not only an ineffective sealing device; its porosity has also ironically prompted adjacent wealthy residents to retreat inside their large homes and raise their boundary walls. Not only do walls make obvious the intentions and anxieties of people on the outside trying to control the presence and growth of a low-income community, but spatial practices and negotiations around involuntarily built enclosures can minimise their restrictive intent and provide opportunities for enclosed communities to demand their rights to space.