A building is supposed to provide safety, shelter and protection. Yet across Nigeria, building collapses have repeatedly turned ordinary homes, schools, workplaces and construction sites into disaster scenes.
A building collapse occurs when a structure or part of it fails and falls because its structural components can no longer safely support the loads placed upon them. The consequences can include deaths, injuries, displacement, loss of property and interruption of community activities.
Nigeria’s National Emergency Management Agency (NEMA) lists structural incidents, including building and bridge collapse, among the human-induced hazards capable of causing mass fatalities.
The important lesson is that many building collapses should not be treated as unavoidable accidents. Problems with design, construction, materials, supervision, maintenance and land use can sometimes be identified before a structure becomes dangerous.
Why Do Buildings Collapse?
There is rarely one explanation for every building collapse.
A building is a system in which different components must work together. The foundation must safely transfer loads to the ground. Columns, beams, slabs, walls and other structural elements must be properly designed and constructed.
When one or more important components are inadequate, the safety of the entire structure can be affected.
Research on building projects in Nigeria has identified factors such as inadequate planning, structural problems, improper scheduling and failure to engage qualified professionals as important contributors to project failure.
Other possible problems include poor-quality construction materials, unauthorized alterations, overloading, inadequate foundations, poor workmanship and lack of maintenance.
This is why building safety begins before the first block is laid.
Poor Construction Practices
One major concern is the use of inappropriate or substandard construction practices.
A building may look complete from the outside while serious problems exist within its structural components.
For example, using unsuitable materials, incorrect proportions in concrete mixtures, inadequate reinforcement or poor workmanship can compromise structural strength.
The problem may remain hidden until the building experiences a significant load or environmental stress.
This is why construction should be supervised by appropriately qualified professionals rather than relying solely on the experience of unqualified workers.
Building Codes and Approval Matter
Building regulations are not simply bureaucratic requirements.
They exist to ensure that buildings meet minimum safety standards.
NEMA’s response to the 2024 Jos school building collapse emphasized the importance of complying with building codes. The agency’s Director General described the tragedy as avoidable and called for adherence to building regulations.
Proper approval processes can help authorities assess whether proposed developments meet relevant planning and structural requirements.
However, approval is only one part of the process.
There must also be effective inspection during construction and action against unsafe or unauthorized development.
A Nigerian Case Study: The Jos School Collapse
A tragic example occurred in Jos, Plateau State, in July 2024, when a school building collapsed while students were inside.
NEMA reported that its Director General visited the site and described the loss of lives as an avoidable tragedy. Search-and-rescue operations involved NEMA, the state emergency agency, police, civil defence, fire service and other stakeholders.
The incident demonstrates why structural safety is particularly important in schools.
Children spend several hours inside educational facilities every day. A school should therefore be among the buildings receiving careful attention from authorities.
A structural problem in an empty building is serious.
The same problem in a crowded classroom can become a mass-casualty disaster.
Building Collapse Is Also an Ilorin Issue
This problem is not restricted to Lagos or other large cities.
Kwara State has also experienced structural-collapse incidents.
In June 2025, two construction workers reportedly died and another person was seriously injured when part of the old fence at Kwara Hotels in the GRA area of Ilorin collapsed during construction work.
Although the incident involved a section of a fence rather than an entire multi-storey building, it illustrates the risks associated with construction and demolition activities.
Construction sites can contain weakened structures, excavations, heavy equipment and temporary supports. Workers and members of the public can be exposed if these hazards are not properly controlled.
This is why construction-site safety should form part of environmental and occupational health planning.
Distressed Buildings Can Give Warning Signs
One of the most important opportunities for prevention is recognizing signs that a building may be unsafe.
Warning signs can include:
- Large or rapidly developing cracks.
- Cracks appearing around columns or beams.
- Significant tilting of walls.
- Doors or windows suddenly becoming difficult to open.
- Floors becoming noticeably uneven.
- Unusual sagging of ceilings or slabs.
- Separation between walls and structural elements.
- Water damage affecting structural components.
- Unusual sounds such as persistent cracking.
- Visible deterioration of important structural elements.
These signs do not automatically mean a building will collapse.
However, they should not be ignored.
A qualified building or structural professional should assess serious structural concerns.
People should not attempt to determine structural safety simply by looking at a crack and deciding that it is harmless.
An Important Lesson From Lagos
A 2024 incident in Lagos provides a particularly useful example of why early reporting matters.
NEMA reported that a two-storey building in Sari Iganmu had already been marked as distressed and residents had been instructed to evacuate. The occupants initially remained in the building, but they eventually evacuated before the structure collapsed. No casualty was recorded.
This case contains a powerful lesson.
A warning only saves lives if people act on it.
When authorities identify a building as unsafe, residents should not continue occupying it because they believe the building “still looks strong.”
A structure can fail suddenly.
Overloading Can Create Problems
Buildings are designed to carry specific loads.
Changing how a building is used can alter the loads it experiences.
For example, a building originally designed for residential use may later be converted into a warehouse, shop or other facility without adequate structural assessment.
NEMA documented a 2024 building collapse in Chanchaga, Niger State, where a residential building had reportedly been illegally converted into a warehouse and became overloaded with beverages.
This demonstrates why changes in building use should be properly assessed.
A structure designed for one purpose should not automatically be assumed to be suitable for another.
Rainfall Can Expose Structural Problems
Heavy rainfall can also become relevant to building safety.
Water can weaken surrounding soil, expose drainage problems and affect already-vulnerable structures.
In July 2024, NEMA reported the collapse of a newly completed two-storey building in Mushin, Lagos, during heavy rainfall. Seven people were rescued, with several sustaining injuries. NEMA also reported that the collapsed building and an adjoining building had previously been marked for structural testing.
This does not mean that rainfall alone caused the collapse.
Rather, it demonstrates why structural condition, drainage and environmental conditions need to be considered together.
What Can Be Done?
Building-collapse prevention requires action at several levels.
Before construction
Site conditions should be investigated.
Plans should be prepared by qualified professionals.
Appropriate building materials should be specified.
Necessary approvals should be obtained.
During construction
Construction should follow approved designs.
Materials should meet required standards.
Qualified professionals should supervise important structural work.
Authorities should carry out appropriate inspections.
Unauthorized alterations should be stopped.
After completion
Buildings should be maintained.
Structural problems should be investigated promptly.
Major renovations or changes of use should receive professional assessment.
Distressed buildings should be evacuated when authorities determine that they are unsafe.
The Role of Environmental Health Professionals
Building safety may appear to be primarily an engineering issue, but it also has an environmental-health dimension.
Environmental health professionals are concerned with conditions that can affect human health and safety.
A poorly maintained or unsafe building can expose occupants to physical hazards.
A collapsed building can also create sanitation problems, injuries, displacement and disruption of essential services.
This is why environmental health practice benefits from collaboration with engineers, urban planners, emergency agencies, building-control authorities and community leaders.
From my Environmental Health Science training, one lesson that stands out is the importance of identifying hazards before they cause harm. The late Professor Henry Sawyer was among the lecturers who contributed to my academic foundation, and that preventive approach remains relevant when looking at structural hazards in Nigerian communities.
What Should Residents Do?
Residents should take structural warning signs seriously.
If a building develops significant cracks, begins to tilt or shows other worrying changes, occupants should report the situation to the relevant building-control or emergency authority and seek professional assessment.
If a building has been officially declared unsafe, people should evacuate rather than waiting for visible collapse.
Neighbours also have a role.
If an obviously distressed building is being occupied, reporting the situation could potentially prevent injuries or deaths.
Conclusion
Building collapse is a serious Nigerian disaster that can affect homes, schools, workplaces and construction sites.
Recent incidents in Jos, Lagos and Ilorin demonstrate that structural failure is not limited to one part of the country.
The best response is not simply to rescue people after a building has fallen.
Prevention must begin with proper planning, appropriate design, qualified professionals, good construction practices, effective inspection, responsible maintenance and respect for building regulations.
Most importantly, warning signs must be taken seriously.
A building collapse can happen in seconds, but the conditions that make a building unsafe may develop over months or years.
Recognizing those conditions early gives Nigeria an opportunity to prevent the disaster rather than simply respond to it.
References
- National Emergency Management Agency (NEMA). National Mass Fatality Response Plan.
- National Emergency Management Agency (NEMA). DG NEMA assesses Jos school building collapse and sympathizes with victims, 2024.
- National Emergency Management Agency (NEMA). NEMA responds to a 2-storey building collapse in Lagos, 2024.
- National Emergency Management Agency (NEMA). Building collapse at Mushin, Lagos State, 2024.
- National Emergency Management Agency (NEMA). NEMA responds to building collapse in Chanchaga LGA, Niger State, 2024.
- Oyekola, T. (2025). Kwara Hotels fence collapses, kills two, injures one. The PUNCH.
- Assessment of early warning signs predisposing building projects to failure in Nigeria. International Journal of Construction Management.
- Assessment of factors influencing the failure and abandonment of multi-storey building projects in Nigeria. International Journal of Construction Management.
