Key points
- The wall does not remove risk: it pushes it onto the outside street, which loses the eyes that watched it, and justifies the next wall.
- Evidence on crime reduction is mixed; residents feel safer but their sense of community is weaker.
- Sabatini and Brain: in Latin America walls brought rich and poor closer at metropolitan scale while separating them at street scale.
Security through walls is the answer millions of Latin American families have given to fear: gated compounds with a perimeter, a gatehouse, cameras and spaces of their own that privatise functions that used to be urban, surveillance, the park, children's play, sometimes even rubbish collection and asphalt. The street ends at a wall with no door and no pavement, and a girl going to the school on the other side must skirt the perimeter for almost a kilometre along a path with no shade or shops while inside there is lawn, a pool and a camera watching her.
The question is not whether anyone has the right to protect their home but whose the street is when every compound protects itself alone, and the answer of urban research is that the wall does not remove risk: it pushes it a few metres away and leaves it on the side of those who cannot pay.
The mechanism: from Jane Jacobs to Caldeira's fortified enclaves
Jane Jacobs described the mechanism decades ago: a street's real safety depends on the eyes watching it from windows and shops, and a blind perimeter removes exactly that. The better protected the inside, the more deserted and less watched the outside, and the empty street is perceived as dangerous, which justifies the next wall in a self-feeding cycle. The anthropologist Teresa Caldeira studied that process in São Paulo and called it fortified enclaves in City of Walls (2000): privatised, enclosed and monitored spaces for residence, consumption and work that turn their back on the street and use security as a criterion of status. Fear stops being a reaction and becomes a commodity sold with the flat, the pool and the gym.
Measurable urban form: big blocks, cars and vanishing shops
The resulting urban form is measurable. Blocks grow until they lose pedestrian scale, routes lengthen and force the car even for short trips, and literature reviews on gated communities consistently find greater car dependence and lower walkability. Mixture disappears: local shops find no customers on a pavement without people, and without shops the pavement is lonelier still. What is lost is not only urban beauty but the place where different people coincide without planning to, which is the simplest definition of public space.
What the data say: felt safety, crime and community
The data are less clear-cut than either side claims. A comparative study of gated and open high-income developments found that walled residents felt clearly safer but that there was no significant difference in the actual crime rate, and that their sense of community was weaker; other research finds fewer burglaries inside the enclosures, and a South African study found more robberies in the enclaves and their immediate surroundings. Recent reviews conclude that the evidence on crime reduction is mixed and warn of a false sense of security. Setha Low, interviewing residents of American gated communities, found that inside the walls people reported insecurity, status anxiety and constant worry: enclosure did not calm fear, it kept it active.
Santiago, São Paulo, Buenos Aires and Sabatini's counterargument
The Latin American cases show how far the model goes. In Santiago de Chile, gated condominiums became the main form of residential production for the middle and upper classes, first in the wealthy east and then in peripheral municipalities of working-class origin; in São Paulo and Buenos Aires, with Alphaville and Nordelta as emblems, the format combined with motorways and shopping malls until it allowed a whole life without setting foot on an open street.
The counterargument is strong: Francisco Sabatini and Isabel Brain argue that in Latin America the walls allowed high-income families to settle beside working-class neighbourhoods instead of concentrating in a single wealthy sector, reducing the distance between classes at metropolitan scale even while raising a barrier at street scale; and in contexts of real violence, closing a compound is a reasonable response by families who receive insufficient public protection.
It can still be argued that this rational response produces an irrational collective result: a city of protected islands and abandoned streets where safety is bought and insecurity is shared out. The alternative is not to ban walls but to make them unnecessary: legitimate police presence and services in the neighbourhoods where violence is real, rules obliging compounds to keep active façades, continuous pavements and public access, and quality public space that returns to the street the eyes that watch it. Security built with walls protects those who can pay for it; security built with city protects everyone.
Frequently asked questions
Do gated communities reduce crime?
The evidence is mixed: a comparative study found walled residents felt safer with no significant difference in actual crime and a weaker sense of community, other research finds fewer burglaries inside and a South African study found more robberies in the enclaves and their surroundings; reviews warn of a false sense of security.
What are fortified enclaves according to Teresa Caldeira?
They are the privatised, enclosed and monitored spaces for residence, consumption and work that Caldeira described in São Paulo in City of Walls: they turn their back on the street, use security as a criterion of status and turn fear into a commodity sold with the flat, the pool and the gym.
