Global Housing Crisis Leaves 3.4 Billion Without Adequate Homes

UN-Habitat’s World Cities Report 2026 warns that 3.4 billion people lack adequate housing worldwide, turning housing into one of the most urgent global urban challenges. The report’s findings connect with recent Mexican reforms that define adequate housing through nine criteria and with the government’s plan to build 1 million new homes and regularize 1 million housing deeds.

The global housing crisis has reached unprecedented levels, with up to 3.4 billion people lacking access to secure, safe, and adequate housing, according to UN-Habitat’s World Cities Report 2026: The Global Housing Crisis: Pathways to Action. The report, launched during the 13th World Urban Forum in Baku, Azerbaijan, warns that housing has become one of the most urgent development challenges facing cities worldwide.

The crisis is no longer limited to the absence of shelter, as more than 1 billion people live in informal settlements and slums, often facing insecure tenure, overcrowding, exposure to environmental risks, and limited access to basic services. The global housing deficit has also widened, rising from 251 million units in 2010 to 288 million in 2023, driven by displacement, conflict, climate-related disasters, economic pressures, and rapid urban growth.

UN-Habitat estimates that addressing the crisis will require between US$3 trillion and US$4 trillion annually through 2030, underscoring the scale of investment needed to close housing gaps. However, experts warn that the solution cannot be reduced to simply building more housing units. At the World Urban Forum, civil society representatives argued that the real question is not only how much housing is built, but where it is built, who can afford it, and whether communities are protected from displacement.

Paula Sevilla, Housing Justice Researcher, International Institute for Environment and Development, says the crisis also reflects unequal access to financing, as many vulnerable populations remain excluded from formal credit systems. She stresses the importance of civil society in mapping informal settlements and mobilizing alternative resources. 

The United Nation has called for a broader response that treats housing as a human right and a foundation for sustainable urban development. According to the report, governments should move beyond homeownership-centered policies and consider rental housing, cooperatives, community-led models, and upgrading initiatives for informal settlements. The report highlights examples from countries including Brazil, Cambodia, Jordan, the Philippines, Tanzania, and Thailand, where participatory housing approaches have helped communities shape more inclusive urban solutions.

Climate resilience is also becoming central to housing policy. UN-Habitat warns that inadequate housing increases exposure to floods, heat, storms, and other climate-related hazards, particularly in informal settlements. The agency recommends energy-efficient, low-carbon housing, and resilient urban infrastructure, alongside community-led upgrading projects that improve existing neighborhoods instead of displacing residents.

The report also points to a broader role for the UN system in helping countries move from short-term responses to long-term housing strategies. This includes supporting national housing policies, promoting housing as a human right, coordinating international cooperation, advancing climate-resilient planning, and backing community-driven urban upgrading.  

UN-Habitat argues that housing must be placed at the center of development policy. Without stronger financing, community participation, climate adaptation, and protection against displacement, the global housing crisis could continue to deepen, leaving millions more without access to a safe and dignified home.

Mexico’s Role in the Global Housing Agenda

Mexico appears in the report as an example of how large-scale housing institutions can support social housing delivery. UN-Habitat highlights Mexico’s National Workers Housing Fund (INFONAVIT) as a major social housing mechanism, noting that it has helped expand access to housing finance for formal workers. However, the report also places this type of model within a broader global debate where the housing policy must move beyond unit production and mortgage access to ensure homes are affordable, well located, connected to services, and resilient to climate risks.

This framing aligns with Mexico’s recent reform to the Housing Law, which formally defines adequate housing through nine criteria: affordability, access to services, habitability, legal security of tenure, location, cultural adequacy, accessibility, sustainability, and inclusive design. The reform also connects with Mexico’s broader housing strategy, which includes the construction of 1 million new homes, with 500,000 units to be developed by Infonavit and 500,000 by CONAVI. It also includes the regularization of 1 million housing deeds, aiming to strengthen legal certainty for families.

As part of UN-Habitat’s recommendations include: strengthening the social function of housing, expanding affordable and rental options, improving land governance, and aligning housing with compact, connected and climate-resilient urban planning, echo long-standing concerns in Mexico over peripheral housing, access to infrastructure, and the distance between affordable homes and employment centers.

UN-Habitat selected Mexico City to host the 14th World Urban Forum in 2028, citing the city’s organizational capacity, political commitment, infrastructure readiness and vision for inclusive, sustainable and resilient urban development. The decision positions Mexico as a key platform for advancing debates on adequate housing, urban inequality, land use, and climate resilience in Latin America.