By Rabiu Usman
Building collapse in Nigeria is no longer a rare construction accident. It has become a recurring public-safety problem, with failures reported in homes, schools, markets, churches, commercial premises and buildings still under construction. The pattern is particularly worrying during the rainy season, when prolonged rainfall, waterlogged soil, flooding and poor drainage can expose weaknesses that may have remained hidden during dry months.
This makes the present period especially important. Nigeria is already deep into the 2026 rainy season, and the Nigerian Meteorological Agency (NiMet) has projected normal to above-normal rainfall in several parts of the country, with longer-than-normal rainy seasons expected in Lagos, Benue, Enugu, parts of Ebonyi, Ogun, Oyo, Nasarawa, Anambra, Kwara, Kebbi, Kaduna, Gombe and Taraba. NiMet specifically identifies its seasonal climate information as relevant to building and construction and disaster-risk reduction.
The warning is therefore not theoretical. When heavy rain saturates poorly drained ground, the engineering conditions around a building can change significantly. Water can reduce soil strength, wash away supporting material, worsen erosion and enter cracks or poorly protected foundations. Where a structure was already weakened by defective materials, inadequate reinforcement, poor workmanship or an improperly designed foundation, severe rainfall can become the trigger that exposes those underlying defects.
Recent research reinforces this connection. A 2026 study by researchers associated with the Nigerian Building and Road Research Institute (NBRRI), examining selected building-collapse cases across Nigeria, identified substandard construction materials as the leading causative factor, accounting for 35.38% of cases. Geotechnical failures accounted for 21.54 per cent, while poor or non-professional design accounted for 13.85 per cent. The study also found that many of the investigated collapses occurred during the rainy season, when soil saturation can reduce bearing capacity.
This evidence matters because public discussions about collapsed buildings often stop at the immediate trigger: heavy rain, foundation failure or an apparent structural defect. But rain does not ordinarily make a properly designed and properly constructed building suddenly collapse. In many cases, it reveals a chain of earlier failures.
The chain may begin with a developer trying to reduce costs. Cement may be reduced in concrete or mortar. Sandcrete blocks may be poorly mixed or inadequately cured. Reinforcement may be smaller than specified or improperly placed. A foundation may be designed without adequate knowledge of the soil. Columns may be altered to accommodate architectural changes. Drainage may be ignored. Construction may proceed without effective supervision by qualified professionals.
Each decision may appear to save money. Collectively, they can create a structure with little margin for error.
The quality of sandcrete blocks is a particularly important concern. A block that looks solid from the outside may not have the compressive strength required for its intended use. The National Building Code and Nigerian Industrial Standards provide technical requirements for construction, while NBRRI research and professional bodies have repeatedly highlighted material quality as a major concern. Yet the responsibility for checking what reaches a construction site remains fragmented among manufacturers, suppliers, developers, professionals and regulators.
The problem is therefore not simply that Nigeria lacks rules. It is that compliance is often weaker than the rules themselves.
A 2026 study published in Scientific Reports found that Lagos, which accounts for more than half of reported Nigerian building-collapse cases in some historical datasets, continues to experience serious compliance problems despite having institutions responsible for planning approvals, building control and materials testing. The study linked the persistence of collapses to inadequate supervision, non-compliance, enforcement difficulties and institutional weaknesses.
Lagos illustrates the broader national challenge. Rapid urbanisation, pressure for housing, expensive land, informal development and intense construction activity create incentives to build quickly and cheaply. But the same pressures are increasingly visible in other cities.
A 2025 study of Abuja identified 30 reported building-collapse cases between 2008 and 2024, resulting in at least 57 deaths. It ranked substandard materials, structural failures, use of unqualified practitioners, inadequate supervision and poor geotechnical investigation among the leading causes.
The evidence also shows that the problem is not confined to old or abandoned structures. Recent investigations include buildings under construction, demonstrating that some failures occur before a project is completed. A 2025 NBRRI case compilation, for example, recorded collapses in Lagos, Kano, Abuja, Anambra, Abia and other locations associated with factors including substandard materials, poor workmanship and inadequate geotechnical investigation. One case in Fagge Local Government Area of Kano State in July 2025 involved a three-storey building under construction and resulted in four deaths and seven injuries.
That should concern every state government.
The solution cannot be another round of statements after people have died. Prevention must begin before the first block is laid.
State building-control agencies and local planning authorities need sufficient personnel, laboratories, vehicles and digital systems to conduct meaningful inspections. Approval should not end with the issuing of a permit. Inspectors should verify critical stages, including excavation and foundation work, reinforcement before concrete is poured, structural frames, blockwork and roofing where applicable.
Developers should also be required to maintain proper construction records, including evidence of material testing and professional supervision. Where a building deviates materially from an approved design, work should stop until the change is reviewed and authorised.
The current wet season provides an immediate opportunity for governments to act. Building-control authorities should identify structures already showing warning signs: major cracks, leaning walls, exposed or corroded reinforcement, unusual settlement, damaged foundations, persistent water intrusion and buildings affected by erosion or flooding. Such structures should be professionally assessed rather than left until they fail.
The Council for the Regulation of Engineering in Nigeria (COREN) has recognised the seriousness of the problem. In June 2026, it approved a 90-day Engineering Regulation Monitoring and Enforcement Rapid Response Task Force to strengthen project monitoring, combat quackery and support efforts to prevent engineering failures, including building collapse.
That initiative should translate into visible action on construction sites.
The Council of Registered Builders of Nigeria has also warned that preventive maintenance is essential, particularly during the rainy season. Its 2026 rainy-season advisory highlighted blocked drains, neglected roofs and poor site management as factors that can increase flooding and structural risks.
These warnings should not remain professional advice circulated among experts. They should become part of public safety communication.
Homeowners and tenants also have a role. A large crack that suddenly widens, doors or windows that become difficult to close, floors that develop noticeable slopes, repeated water penetration or unexplained movement in walls should not be dismissed as ordinary ageing. Such signs require assessment by qualified professionals.
Government must also confront the economics of unsafe construction. Developers operating under financial pressure may be tempted to substitute cheaper materials, employ unqualified artisans or bypass professional supervision. Enforcement should therefore target the entire chain of responsibility—not only the owner after a collapse, but also professionals, contractors, material suppliers and manufacturers where negligence or deliberate violations are established.
At the same time, sanctions must follow due process and be based on properly documented technical investigations. Every major collapse should generate an independent engineering report identifying the failure mechanism, responsible parties and regulatory gaps. Such reports should inform future inspections and policy rather than disappear after the immediate rescue operation ends.
Nigeria cannot continue treating building collapse as an unavoidable consequence of development. The country has engineers, architects, builders, planners, material scientists, laboratories and regulatory institutions capable of preventing many of these failures.
What is required is coordination and enforcement.
With the rainy season already exposing weak drainage, saturated soils and poorly maintained structures, the priority should be prevention rather than rescue. Governments should inspect vulnerable buildings now, test suspect materials, enforce stop-work orders where necessary, clear drainage around public facilities and ensure that construction professionals remain accountable for the work they certify.
A collapsed building leaves behind more than rubble. It leaves bereaved families, injured survivors, displaced tenants, lost businesses and a community questioning whether the tragedy could have been prevented.
In most cases, the answer will depend on what was done or ignored long before the building fell.
Nigeria must therefore move from reacting to collapsed buildings to identifying and eliminating the conditions that make collapse possible. In a country entering the most demanding months of the rainy season, that is not merely a construction-sector responsibility. It is a public-safety obligation.
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