Foundations

Legal status over time

How Brazilian law has classified, criminalized, ignored, and slowly recognized favela housing across the twentieth and twenty-first centuries.

For most of their history, Brazilian favelas have existed in a legal gray zone: physically present, demographically counted, economically integrated, but treated by formal law as irregular settlements without the standing accorded to titled property. The shape of that gray zone has changed considerably over time, and continues to change. The trajectory is from prohibition to invisibility to selective recognition to a still-incomplete framework of regularization.

The early 20th century: prohibition without provision

Rio de Janeiro's first detailed building code, the 1937 Código de Obras, declared favela construction illegal and instructed authorities to dismantle existing settlements and prevent new ones. The code offered no path to regularization, no replacement housing, and no recognition of property held in the favelas. Similar municipal regimes elsewhere followed the same logic: the law denied the legitimacy of the housing while taking no effective steps to provide alternatives. The result was a sustained gap between legal text and lived practice.

Federal-level law during this period treated land tenure conservatively, building on civil-code provisions that privileged formal title and made adverse possession (usucapião) a slow and limited remedy. Where favelas occupied public land, the question of whether the state could be deemed to have acquiesced was not seriously entertained.

Mid-century: counted but not titled

By 1948 Rio's municipal government conducted its first comprehensive favela census, identifying roughly 119 communities. The act of counting was itself a recognition. But administrative counting did not translate into legal status. Favela residents had no titles, no postal addresses recognized by the federal mail service in many cases, and no legal protection against summary eviction.

The 1964 military coup and the establishment of the National Housing Bank (BNH) and the metropolitan housing coordination CHISAM produced an era of state-led removals, particularly in Rio. From the late 1960s into the early 1970s, residents were relocated to peripheral housing projects, including Cidade de Deus, Vila Aliança, and Vila Kennedy. The removals proceeded under emergency powers and did not require the legal recognition of prior tenure; on the contrary, they relied on residents' lack of title.

1988: a constitutional turn

The 1988 Constitution included a chapter on urban policy (Articles 182 and 183) that bound the function of property to a "social function" and recognized, for the first time at constitutional level, the possibility of acquiring urban property by adverse possession after five years of uninterrupted possession of a property of up to 250 square meters for residential use. This usucapião especial urbano was a foundational change: residents who had held favela housing for years could, in principle, acquire title through judicial recognition.

Implementation was slow. The Constitution required infralegal statutes to operationalize most of its urban provisions, and these came in stages: the Estatuto da Cidade (City Statute) of 2001, the regularization-of-public-lands provisions of 2009, and the consolidated regularization framework of 2017.

The 2001 City Statute

Law 10.257/2001, the Estatuto da Cidade, regulated the urban-policy chapter of the Constitution and introduced specific tools for informal settlements. Among them were Zonas Especiais de Interesse Social (ZEIS, Special Zones of Social Interest), an urban-planning category that municipalities could apply to favelas and other low-income areas to allow flexible building standards, prioritize public investment, and enable group regularization. ZEIS became a workhorse of progressive municipal planning over the following two decades.

The City Statute also clarified the use of usucapião coletivo (collective adverse possession), under which groups of residents in informal settlements could file jointly to acquire title, removing the requirement that each household demonstrate exclusive possession of a defined lot — a requirement that had been impossible to meet in many favelas because lots blurred into one another.

2009: federal lands and Law 11.977

Law 11.977/2009, which created the federal Minha Casa Minha Vida housing program, also contained a chapter on land regularization. It established a framework for the regularization of informal settlements on federal and other public lands, including a streamlined administrative procedure that did not require individual lawsuits. This chapter was the first sustained federal mechanism for the mass titling of favela land. Its uptake was uneven, and many of its provisions were superseded by the 2017 framework.

2017: REURB

Law 13.465/2017 — Regularização Fundiária Urbana, or REURB — consolidated the regularization framework into a single statute. REURB created two tracks: REURB-S, for low-income settlements (effectively, for favelas), and REURB-E, for higher-income irregular subdivisions. REURB-S provides for free or subsidized titling, recognizes a wide range of evidence of possession, and allows the municipal government to drive a collective regularization process rather than requiring individual filings.

The law has been criticized from several directions. Some housing-movement organizations argue that it weakened protections against speculative regularization in REURB-E and that its accelerated procedures favor formal recognition over genuine urban upgrading. Some legal scholars argue, conversely, that the law's provisions on REURB-S are appropriate but that municipalities have not allocated sufficient resources to implement them. Uptake has been uneven across states and cities.

Where legal status sits today

The current legal landscape for favela residents can be summarized as follows. Constitutionally and statutorily, urban property serves a social function, and long-term residents of informal settlements have access to multiple legal pathways to title: individual usucapião, collective usucapião, ZEIS-based municipal regularization, and REURB-S. In practice, titling remains slow, partial, and concentrated in a small number of well-resourced municipalities.

For housing not yet regularized, the legal protections against eviction are also substantial. Federal jurisprudence has repeatedly held that long-standing informal occupations create obligations on the state — including notification, social-impact assessment, and provision of alternative housing — before any removal can proceed. The 2014 court rulings on Olympic-era removals in Rio reinforced these obligations.

Day-to-day, however, a great deal of favela life still proceeds without formal documentation: properties change hands through private agreements (contratos de gaveta) that have no register; utilities are connected formally or informally according to local arrangements; and access to credit and to some public benefits remains constrained by the absence of titles. The gap between legal recognition and bureaucratic recognition remains the structuring feature.

What is contested

Three questions remain open in the legal literature and in housing-movement politics. The first is whether large-scale regularization, of the kind REURB envisions, is a tool for citizenship or a precondition for displacement through real-estate appreciation. The second is the appropriate role of judicial adverse possession versus administrative regularization, particularly where occupations are on contested public land. The third is the place of community-recognized property arrangements — long-standing in many favelas — in the formal civil-law register. None of these questions has been resolved.