The United Nations’ World Cities Report 2026 puts the global housing shortfall at up to 3.4 billion people, a number that reframes housing as a worldwide development problem rather than a story about a few expensive cities. This article explains what that figure covers, where the pressure is greatest and which fixes the UN and the World Bank point to.
What does the 3.4 billion figure actually measure?
According to the United Nations, the World Cities Report 2026 estimates that “up to 3.4 billion people lack access to adequate housing, secure tenure, basic services or affordable living conditions.” The words “up to” matter. The estimate is a ceiling that combines several kinds of shortfall, not a count of people with no roof at all.
That breadth is deliberate. The UN treats adequate housing as more than four walls. Secretary-General António Guterres is quoted by the UN as saying, “Housing is more than just shelter. It is foundational to tackling inequality and speeding sustainable development.” A household can have a physical structure and still fall short if it has no legal protection from eviction, no safe water or sanitation, or rent that consumes the family budget.
The practical lesson is to read the headline as a measure of several overlapping problems. Someone in an informal settlement without services and someone in a formal apartment paying unaffordable rent are both counted, though their situations and the policies that would help them differ greatly.
How many people live in slums and informal settlements?
Slums are the most visible subset. The UN’s World Cities Day page says the report counts “more than one billion people living in informal settlements and slums.” The UN’s SDG 11 page gives a more precise figure of 1.16 billion people living in slums or informal settlements without basic services. The World Bank, for its part, says roughly one quarter of the world’s urban population, over one billion people, lives in such settlements, without giving a year.
These numbers agree on the order of magnitude: more than a billion people. The differences in precision reflect different dates and definitions, which is common in global housing statistics.
The SDG 11 page also describes where slum residents live:
| Region | People in slums or informal settlements |
|---|---|
| Eastern and South-Eastern Asia | 362 million |
| Central and Southern Asia | 334 million |
| Sub-Saharan Africa | 265 million |
Together those three regions total 961 million (362 + 334 + 265). Against 1.16 billion, that is about 83%, so the large majority of slum residents are concentrated in a small number of regions.
Why is housing a global story and not just a local one?
Cities now hold a majority of humanity. According to the UN, around 55% of the world’s people live in towns and cities, a share projected to reach almost 70% by 2050. The UN notes that these figures come from its Department of Economic and Social Affairs, and that urban areas passed rural areas in population in 2009.
The UN’s SDG 11 page adds that rapid urbanization often outpaces the growth of housing, infrastructure and services, which fuels slum expansion. It also says most urban growth happens in small cities and intermediate towns, where it can deepen inequality and poverty. In other words, the strain is not limited to megacities that dominate headlines.
The same page says up to 3 billion people struggle to afford housing. That is a separate framing from the 3.4 billion estimate, and the two should not be added together.
Is the crisis only about cost?
Cost is central, but not the whole picture. The World Bank identifies a lack of affordable housing as a key global issue and says cities must meet growing demand, especially in informal settlements. Yet the UN’s definition also includes secure tenure and basic services, and the SDG 11 page links housing to other urban risks.
Some of those risks are physical. According to the UN, in 2025 one billion people lived in areas prone to severe riverine flooding, and half of them lived in cities. By 2040, more than 2 billion urban residents could face an extra warming of at least 0.5°C, and over a third of the global urban population may experience average annual temperatures of 29°C or higher. Poor-quality housing in hot or flood-prone areas amplifies these hazards, which is why climate resilience appears among the policy priorities for housing.
Which fixes does the UN point to?
The UN’s description of the 2026 report outlines several policy areas:
- Affordable housing in well-located areas, so that low-income households are not pushed to distant urban edges.
- Better land governance, including clearer and more secure tenure.
- Climate-resilient development.
- Inclusive, community-led approaches to planning.
The theme of this year’s World Cities Day, observed on October 31 with a programme running through November 2 in Fuzhou, China, is “Regenerating the City: Adequate Housing for All.” The UN describes it as favoring integrated approaches that connect affordable housing with improvements to public space. It also stresses participatory regeneration with safeguards against displacement, so that existing residents benefit from upgrades rather than being priced out.
That last point addresses a long-standing criticism of urban renewal: improved neighborhoods can raise rents and push out the people they were meant to help.
What do successful projects look like?
The World Bank offers several examples of its own financed projects, though the page gives no dates for most:
- Indonesia: a National Slum Upgrading Project improved living conditions for 8.7 million people and upgraded more than 11,000 hectares of slum areas.
- Mexico: an affordable housing project supported more than 28,000 low-income beneficiaries in acquiring energy-efficient homes, with 70% of support going to the lowest-income households.
- Colombia: a housing project aims to improve access to formal housing and upgrade precarious settlements, including for Venezuelan migrant households.
- Ukraine: a World Bank-financed project is helping repair housing damaged by Russia’s invasion, according to a feature dated July 9, 2025.
The Bank says it invests an average of $6 billion a year in urban development, resilience and land, and that as of 2026 its active urban portfolio includes more than 200 projects worth over $40 billion. These are the institution’s own descriptions, so they show the type of intervention on offer rather than independent evaluations of results.
How does housing connect to other global pressures?
Housing sits at the crossing point of several themes covered elsewhere. The World Bank says over half of forcibly displaced people now live in urban areas, which ties the topic to the recent decline in global forced displacement: displaced families often join the informal rental and settlement markets that are already stretched.
Population change matters as well. Cities in regions with aging populations face a different set of needs, such as accessible homes and services, than fast-growing cities where young households crowd into informal housing. Resource limits also show up in urban life, as explored in the growing global pressure on water supplies, because a home without reliable water or sanitation is not adequate under the UN’s definition.
Cost is the final link. When rent absorbs a large share of income, households have less room for other essentials, the dynamic behind the IMF’s guidance on cost-of-living crises.
What counts as progress by 2030?
The measuring stick is SDG target 11.1, which calls for ensuring access for all to adequate, safe and affordable housing and basic services, and upgrading slums, by 2030. The UN’s SDG 11 page does report some progress on adjacent urban goals: in 2025, 61.5% of urban residents had convenient access to public transport, up from 53.2% in 2020, a gain of 8.3 percentage points. The page also says 131 countries now have national and local disaster risk reduction strategies, up from 57 in 2015.
Those improvements are real but do not translate directly into housing. With more than a billion people in informal settlements and an estimated ceiling of 3.4 billion with inadequate housing, the 2030 deadline looks distant from where the numbers stand.
A big number with a narrow set of levers
The 3.4 billion estimate is best understood as a map of overlapping shortfalls: insecure tenure, missing services, unaffordable rents and unsafe locations. The levers the UN and the World Bank describe, from land governance to slum upgrading to community-led regeneration, are well known. What the new report adds is scale, and a reminder that adequate housing underpins health, climate resilience and economic opportunity in the cities where most people will soon live.
This article is general information about world affairs and is not legal, policy or financial advice.
Sources: United Nations; World Bank
