Slum Upgrading Through Resident-Led Design And Natural Building

The history of forced relocation from informal settlements is one of the most extensively documented failures in twentieth-century urban policy. Patrick Geddes observed in his 1917 report on Indian cities that demolition of existing urban fabric, however inadequate, systematically produced worse outcomes than incremental improvement. Charles Abrams documented the same dynamic across Africa, Asia, and Latin America through the 1960s. John F.C. Turner's research in Peru in the 1950s and 1960s produced perhaps the most rigorous evidence: residents forcibly relocated to government housing blocks consistently moved back to informal settlements when given any choice, because the social and economic infrastructure of the settlement outweighed the physical disadvantages of inadequate construction.

The research consensus on forced relocation is clear: it destroys social capital, disrupts livelihood networks, increases commuting time and cost to employment, and produces mental health deterioration associated with the loss of community and familiar environment. Physical housing quality improvements, if they occur, are typically offset by these other factors. Residents who are relocated often cannot afford the ongoing costs of formal housing — utilities, maintenance, association fees — and either fall behind or sublease illegally, recreating the informal dynamics the relocation was supposed to eliminate.

The persistence of relocation as a policy tool, despite this evidence, requires explanation. The explanation is primarily political: demolition and reconstruction produce visible monuments to government action, generate construction contracts that flow through formal procurement channels, and satisfy the aesthetic preferences of middle-class urban planners and politicians who find informal settlement visually offensive and do not live in the communities affected. Upgrading, by contrast, is incremental, messy, and difficult to photograph as a completed achievement.

The most comprehensively documented evidence for resident-led upgrading comes from a series of programs that span several decades and multiple continents. Each demonstrates, in different institutional and cultural contexts, that the participatory approach consistently outperforms top-down delivery on dimensions that matter to actual residents: affordability, appropriateness, durability, and community satisfaction.

Orangi Pilot Project, Karachi (1980-present): Architect Arif Hasan and social organizer Akhtar Hameed Khan developed the Orangi Pilot Project in what was then one of the world's largest squatter settlements, housing approximately one million people in conditions of near-total sanitation failure. The OPP approach rejected external provision of infrastructure in favor of resident-organized lane committees that designed, financed, and built their own internal sanitation systems to government-provided trunk mains. By 2002, over 95,000 houses in 334 lanes had installed sanitary latrines and sewers at a cost of approximately $50 per household, compared to government contractor estimates of $800 per household for equivalent work. The OPP model has since been replicated in Bangladesh, India, and several African countries. The key design element was not technical but organizational: the recognition that residents could manage their own construction if given technical information and legal recognition of their organizational role.

Shack/Slum Dwellers International (SDI) (1996-present): SDI is a network of federations of slum dwellers operating in 33 countries across Africa, Asia, and Latin America. Its model centers on savings groups as the organizational foundation for upgrading — not because the savings produce sufficient capital (they typically do not, alone) but because the savings process creates the regular meeting, the shared accounts, the trust relationships, and the community inventory of assets and needs that serve as the organizational infrastructure for negotiating with government and accessing external resources. SDI federations have negotiated land tenure regularization, infrastructure provision, and housing finance in dozens of cities, consistently achieving better terms and outcomes than communities organized around external advocacy.

Medellín Urban Acupuncture (2004-2011): Mayor Sergio Fajardo's approach to informal hillside settlements in Medellín combined targeted infrastructure investment — gondola transit connections, escalators on steep slopes, library and civic space construction — with neighborhood-level planning participation that allowed residents to identify priority interventions. The approach did not replace informal housing but connected it to the formal city, dramatically reducing commute times and improving access to employment and services. Crime rates fell by over 70 percent in targeted neighborhoods between 2002 and 2011. The Medellín case demonstrates that the organizing principle of upgrading — work with existing settlement structure, not against it — applies to infrastructure as much as to housing construction.

The specific relevance of natural building to slum upgrading is not that it produces better individual structures than alternative approaches — in some dimensions it does, in others it does not — but that it is amenable to the incremental, self-help, resident-managed construction process that upgrading requires.

Consider what a typical informal settlement improvement cycle looks like. A family starts with a corrugated metal sheet structure on a compacted earth floor. Over time, they add: a proper foundation, masonry walls, a more weather-tight roof, interior finishes, additional rooms as the family grows, a second story as the first becomes secure. This process takes years and proceeds in stages defined by available cash, available family labor, and available technical knowledge. Each stage is a discrete construction decision made with the resources available at that moment.

Natural building techniques fit this incremental model precisely. Compressed earth block production can begin immediately with an on-site machine — the earth itself is often available from the foundation excavation. Earthen plaster applied over existing masonry walls immediately improves thermal performance and moisture resistance. A lime-washed interior dramatically reduces the humidity and mold that make corrugated metal structures unhealthy. A compressed earth block extension to an existing structure, built by family members with basic training, costs a fraction of contractor-built masonry and can be completed in stages over months.

The technical assistance required to enable this is not professional design services — it is technical extension: trained community workers who can teach material selection, mixing proportions, construction sequence, and quality checking to people who will do the work themselves. This is the model used by the Undugu Society in Kenya, by FUNDASAL in El Salvador, and by numerous community development organizations across the global south. The knowledge transmission is direct, peer-to-peer, and local — the antithesis of the expert-delivery model that characterizes formal housing programs.

The single most important institutional barrier to resident-led upgrading using natural materials is the regulatory requirement for complete code compliance before any improvement receives legal recognition. In most jurisdictions, a structure either fully meets the building code or it does not — there is no legal category for partial compliance, incremental improvement, or conditional habitability recognition. This means that an informal settlement resident who wants to make legally recognized improvements to their structure must first bring it to full code compliance, which typically requires professional engineering, full permit processing, and reconstruction of elements that may be structurally adequate but not code-prescriptive. The cost and complexity are prohibitive. The result is that the resident either makes no improvements or makes illegal ones — which is what most residents do, rationally, because the alternative is no housing at all.

Several jurisdictions have developed regulatory frameworks that address this problem. Brazil's Special Social Interest Zones (ZEIS) create a legal category for informal settlements that allows incremental improvement without requiring full code compliance as a prerequisite. South Africa's Enhanced People's Housing Process provides a subsidy framework for self-help construction that includes technical assistance and recognizes owner-built structures as subsidy-eligible. Thailand's Baan Mankong (Secure Housing) program, which has reached over 90,000 households since 2003, provides community block grants for settlement upgrading that communities manage themselves, with technical assistance but without prescriptive requirements about construction methods.

These frameworks share a critical design feature: they define the goal of intervention as improvement of actual living conditions, not achievement of a regulatory standard. They measure success by outcomes — habitability, structural safety, access to services, security of tenure — rather than by process compliance. This is the appropriate measure for housing policy. A building code that makes better housing legally impossible is a policy failure, not a legal success.

Scaling resident-led upgrading with natural building technical support requires investment in several specific areas that are underrepresented in current housing policy:

Community technical extension workers: Not architects or structural engineers, but trained practitioners who can teach natural building techniques, identify structural problems, and support residents in the construction decisions they are already making. Training these workers is relatively fast — a six-month intensive program can produce competent extension workers — and the multiplier effect is substantial: each worker supports dozens of households simultaneously.

Material supply infrastructure: On-site earth block production is often possible, but consistent access to quality lime, appropriate stabilizers, and basic tools requires supply chain development. Community building material centers — cooperative enterprises that provide materials, tools, and technical advice to settlement residents — have been piloted in several countries and represent a viable infrastructure model.

Progressive tenure security: Security of tenure is the most basic precondition for housing investment. Residents do not invest in improving structures on land they can be removed from without notice. The regularization of tenure in informal settlements — not necessarily through full freehold title, which can trigger gentrification — through community land trust models, occupancy certificates, or ZEIS-type zones is a prerequisite for any upgrading investment to be durable.

Community savings and progressive finance: Mainstream mortgage finance does not work for incremental self-help construction. Community savings groups, progressive stage-release loans, and material revolving funds have all demonstrated viability for financing slum upgrading. The institutional infrastructure to provide these at scale — community finance cooperatives, savings-linked housing finance programs — exists in prototype and requires deliberate scaling.

The combination of these elements is not complicated. It does not require new technology or novel institutional design. It requires the political decision to allocate housing policy resources toward what works, rather than toward what looks impressive in a ribbon-cutting photograph.