Understanding Informal Settlements: Types and Challenges in Urban Areas

In cities across the developing world, a silent transformation is taking place. As the sun rises over urban landscapes, millions of people wake up in homes that exist outside official city maps, built without permits on land they don’t legally own. These are informal settlements, where residents create their own shelter and communities despite lacking formal recognition or government support. Understanding these settlements is crucial because they house nearly a billion people worldwide and represent one of the most pressing challenges in urban development today.

What are informal settlements? 🔗

Informal settlements emerge when people build homes and establish communities through unregulated processes, without proper legal rights or official authorization. These residential areas develop organically as people respond to the urgent need for affordable housing in cities where formal systems fail to meet demand. According to UN-Habitat, these settlements share several defining characteristics: residents typically lack secure land tenure, neighborhoods often lack basic services and infrastructure, and housing frequently violates planning and building regulations while being situated in environmentally vulnerable locations.

The formation of informal settlements stems from multiple interconnected factors. Rural-urban migration brings thousands of hopeful job-seekers to cities every day, but limited affordable housing options force them to create their own solutions. Weak governance, particularly in urban planning and land management, creates gaps that informal settlements fill. Economic vulnerability and low-wage employment mean that formal housing remains financially out of reach for many urban residents. Additionally, displacement from conflict, natural disasters, and climate change pushes people toward these makeshift communities.

What distinguishes informal settlements from simple poverty is the process through which they develop. While the term “slum” focuses on deteriorated physical conditions and deprivation, informal settlement emphasizes process and agency. Residents aren’t passive victims but active agents who mobilize resources, create social networks, and build communities despite systemic exclusion from formal urban systems.

The diverse types of informal settlements 🔗

Not all informal settlements look or function the same way. They vary considerably based on location, origin, and legal status, creating a complex typology that urban planners must navigate.

Slums and squatter settlements 🔗

The terms “slum” and “squatter settlement” are often used interchangeably, but they highlight different aspects of informality. Slums focus on environmental and quality-of-life aspects, describing highly congested urban areas marked by deteriorated, unsanitary buildings and poverty. These areas may have existed for generations, with buildings that were once formal but have degraded over time.

Squatter settlements, by contrast, emphasize the legality of land occupation. Squatters settle on land without legal right or title, typically on public or unoccupied land. They might establish themselves on urban peripheries, marginal agricultural land, along railway corridors, beside highways, in drainage networks, or on riverbanks. Migrants build their shelters with whatever materials they can access-dry leaves, plastic sheets, bamboo, and mud-creating immediate housing solutions that impact existing land use patterns.

Jhuggi-jhompri clusters 🔗

In the Indian context, jhuggi-jhompri clusters represent a specific form of informal settlement. These are non-notified squatter settlements built without permission from land-owning agencies, mostly on public land. In Delhi alone, jhuggi-jhompri clusters accommodate approximately 2.5 million people. The term has become part of the legal and administrative vocabulary, appearing in court judgments and government policies as authorities grapple with how to address these settlements.

These clusters often develop near employment centers where residents work in domestic service, construction, or informal commerce. Despite lacking formal recognition, jhuggi-jhompri settlements become established communities over time, with residents obtaining ration cards, voter identification, and participating in local elections-creating an awkward tension between their illegal land status and their social integration into urban life.

Unauthorized colonies 🔗

Unauthorized colonies present a different variation of informality. These settlements develop through illegal subdivision and development of land, often on private property, without required approvals from municipal or planning authorities. Unlike squatter settlements where residents occupy land they don’t own, unauthorized colonies typically involve land transactions-people purchase plots in developments that lack official sanction.

In cities like Delhi, unauthorized colonies represent a significant portion of urban housing, sometimes housing middle and lower-middle income groups alongside the poor. The Delhi government has periodically attempted regularization programs, recognizing property rights for residents while bringing these colonies into the formal urban system with proper infrastructure and services.

Pavement dwellers 🔗

At the most extreme end of housing insecurity are pavement dwellers-individuals and families who literally live on city sidewalks and streets. These residents lack even the basic shelter that jhuggi-jhompri dwellers have constructed. They survive in the most exposed conditions, vulnerable to weather, traffic, and forced removal by authorities. Pavement dwelling represents absolute landlessness, where people have no space to call their own except the public thoroughfare they occupy each night.

Resettlement colonies 🔗

Resettlement colonies occupy a unique position in the typology of informal settlements. These planned relocations emerge when governments evict slum and squatter settlement residents, moving them to peripheral urban areas. While residents may receive legal land tenure in resettlement colonies, these sites often lack adequate infrastructure, employment opportunities, and connectivity to the city center where jobs exist. Residents find themselves caught between formal land rights and informal living conditions, often far removed from the social and economic networks that sustained their livelihoods.

Living conditions and everyday challenges 🔗

Life in informal settlements presents daily challenges that compound poverty and limit opportunities for advancement. The physical environment in these communities reflects their informal status, creating hardships that affect health, safety, and quality of life.

Overcrowding and inadequate infrastructure 🔗

Overcrowding defines the spatial reality of informal settlements. Small dwellings house multiple family members, with limited personal space and privacy. This density, combined with poor ventilation and natural lighting, creates uncomfortable and unhealthy living environments. Houses constructed from scavenged materials-recycled lumber, repurposed zinc sheets, and salvaged corrugated iron-offer minimal protection from heat, cold, and rain.

Infrastructure deficits compound these challenges. Residents often lack access to piped water, instead relying on contaminated sources, shared standpipes, or expensive water vendors. Without proper sanitation facilities, communities resort to shared latrines, open defecation, or disposal into nearby drains and waterways. The absence of waste management systems means garbage accumulates in settlements, creating breeding grounds for disease vectors. Electricity comes through illegal tapping of nearby power lines-a dangerous practice that risks electrocution and fire.

Health and environmental hazards 🔗

The concentration of people without adequate services creates serious health risks. Waterborne diseases like cholera and dysentery spread through contaminated water sources. Stagnant water in blocked drains breeds mosquitoes that transmit malaria and dengue fever. Overcrowding facilitates the rapid transmission of respiratory infections and other communicable diseases. Poor nutrition, stress, and limited healthcare access further compromise residents’ health.

Environmental hazards add another layer of vulnerability. Informal settlements frequently occupy land that formal developers avoid-flood-prone areas, unstable slopes, sites near polluting industries, or zones adjacent to waste dumps. These locations expose residents to flooding, landslides, industrial pollution, and other environmental dangers. When disasters strike, informal settlement residents suffer disproportionately because their housing offers little protection and they lack resources for recovery.

Economic and social marginalization 🔗

Beyond physical hardships, residents of informal settlements face systematic exclusion from urban opportunities. Without legal addresses, children struggle to enroll in schools. Lack of formal tenure prevents residents from accessing credit or using their homes as collateral for business loans. Women in informal settlements bear particular burdens, spending extra time and energy accessing water and other services, limiting their ability to engage in paid employment.

The constant threat of eviction creates psychological stress and discourages long-term investment in housing improvements or community development. Why build a better home or start a business when authorities might bulldoze everything tomorrow? This insecurity traps residents in survival mode, unable to plan for the future or accumulate assets that might lift them from poverty.

Yet despite these immense challenges, informal settlements demonstrate remarkable resilience. Residents develop sophisticated social networks, create informal economies that provide essential goods and services, and build communities with their own forms of organization and mutual support. They prove that human ingenuity and determination can create meaningful lives even in circumstances designed to exclude and marginalize.

What do you think? How can urban planning systems better accommodate the housing needs of low-income residents before informal settlements emerge? What responsibilities do governments have toward people who build homes on land they don’t legally own?

References

1. https://unhabitat.org/habitat-iii-issue-papers-22-informal-settlements
2. https://gsdrc.org/topic-guides/urban-governance/key-policy-challenges/informal-settlements/
3. https://unhabitat.org/sites/default/files/2025/08/definitions_-_informal_settlements_-annex_14.08.2025.pdf
4. https://www.gdrc.org/uem/squatters/slumsandsquatters.html
5. https://tos4thyear.wordpress.com/2016/12/03/informal-settlements-and-the-masterplan-by-dendup-tashi-namgyel-lalbiakzuala-ngente-tenzin-shera/
6. https://link.springer.com/chapter/10.1007/978-81-322-2154-8_8