9.1.1 The Regulatory Framework

The Nigerian National Building Code, first published in 2006 by the Federal Ministry of Works and Housing in partnership with the professional bodies (Nigerian Institute of Architects, Nigerian Society of Engineers, Nigerian Institute of Quantity Surveyors, Nigerian Institute of Building, NIESV, COREN), sets minimum standards across structural design, electrical and mechanical systems, fire safety, accessibility, energy performance, and environmental compliance. The Code has been periodically updated; the most recent comprehensive revision was 2025.

State governments are responsible for enforcement. Lagos has the most developed enforcement infrastructure through LASBCA (Lagos State Building Control Agency) which carries out site inspections, issues stop-work orders, and prosecutes serious violations. Abuja relies on the Federal Capital Development Authority (FCDA) and the Department of Development Control. Kaduna State runs KASUPDA. Rivers, Anambra, Imo, Ogun all have their own equivalents with varying degrees of capability.

The structural design code referenced in the NBC draws on the British Standards (BS 8110 for reinforced concrete remains in widespread use, even though it has been superseded internationally by the Eurocodes). Engineers in larger Nigerian practices increasingly work to Eurocode 2 for reinforced concrete and Eurocode 3 for steel, but the Nigerian-approved version of the Code still defaults to BS 8110.

9.1.2 The Practical Quality Failures

A registered engineer following the Code, using verified materials, and supervised properly should produce a safe building. The Nigerian failures are mostly at one of those three points.

Design failures include using a generic foundation specification that does not match the actual soil bearing capacity, under-specifying column sizes to maximise lettable floor area, omitting lateral bracing, designing for the wrong load combinations. The Ikoyi collapse investigations identified design issues among the contributors.

Material failures are perhaps the most depressing because they are mostly avoidable. Substandard reinforcement bars that fail the standard tensile test. Concrete cubes that fail their 28-day compressive strength test. Cement adulterated with low-grade additives. Sand contaminated with salt (from beach sand used in coastal projects). Steel bars manufactured outside the SON-compliant range.

The Standards Organisation of Nigeria has the regulatory authority over construction materials but enforcement is patchy. Independent material testing — through accredited labs like the Nigerian Building and Road Research Institute (NBRRI) or the established commercial testing laboratories — is essential for any project of consequence.

Construction failures include poor concrete placement, inadequate curing (concrete that has not been kept wet for at least 7 days after placement is significantly weaker than properly cured concrete), incorrect rebar placement (laps in the wrong place, cover insufficient, ties missing), poor scaffolding leading to vertical extensions that should never have been built, and the now-infamous “vertical extension” — adding floors to an existing building beyond what the original foundation was designed to carry.

9.1.3 What a Quality Assessment Looks Like

For a mortgage transaction the lender expects a valuation report, which in practice will be produced by an estate surveyor and valuer registered with NIESV and ESVARBON. That report tends to focus on market value, not structural condition. For high-value transactions or properties where condition is uncertain, a separate building survey by a building surveyor or structural engineer is added. Several PMBs and commercial banks now include building surveys as standard for commercial mortgages and for residential mortgages above ₦100M.

A proper building survey covers:

• Foundation type and apparent condition (cracks, settlement, water damage)
• Structural frame (cracks in columns and beams, deflection in slabs, signs of reinforcement corrosion)
• Roof condition (leaks, sagging, missing or damaged tiles/sheets)
• External walls (cracks, render condition, signs of damp)
• Internal finishes (less critical structurally but important for valuation)
• Mechanical and electrical systems (age, condition, code compliance)
• Plumbing and drainage (leak history, water pressure, drainage flow)
• Fire safety equipment and signage

The surveyor produces a condition report — often colour-coded green/amber/red against each item — and an estimate of immediate, near-term, and longer-term repair and replacement costs.

9.2.1 The Pre-Purchase Survey

A buyer considering a purchase of any significant value should commission a pre-purchase survey. The cost — typically ₦150,000 to ₦500,000 for a residential property in Lagos depending on size — is trivial against the purchase price and what it might uncover.

A broker advising a client should always recommend a pre-purchase survey for second-hand properties, properties over 15 years old, properties showing visible cracks or water damage, properties in high-water-table areas (Lekki, parts of VI), and properties that have had visible alterations or extensions. New-build off-plan properties from credible developers may not need the same level of inspection but the buyer should still have an independent inspection at the snagging stage.

9.2.2 The Lender’s Valuation

The lender’s valuation report is contractual evidence to the borrower of the property’s value. It is not a building survey. Confusing the two has cost Nigerian buyers a lot of money. A valuation report says “this property is worth ₦42M”. A building survey says “this property has structural cracks in the rear elevation that need ₦8M to fix”. The lender does not necessarily commission the second report. The buyer, if sensible, does.

NIESV-registered valuers follow the institution’s professional standards and the International Valuation Standards (IVS) for valuation methodology — typically Sales Comparison, Investment Method (rental capitalisation), or Replacement Cost depending on the property type. The valuer will note material defects in the report but is not the primary professional for structural assessment.

9.2.3 Defects and How They Affect Value

Defects affect a property’s value in measurable ways. Surveyors and valuers categorise them:

Major structural defects — anything affecting load-bearing elements. Foundation movement causing visible cracking. Failed beams or columns. Roof structural failure. These can render a property uninsurable and unmortgageable until rectified.

Significant defects — major water ingress requiring full re-roofing or damp-proofing. Failed electrical wiring requiring full re-wire. Major plumbing failures. Asbestos discovery (rare in Nigerian buildings but possible in pre-1990 structures).

Minor defects — cosmetic issues. Failed paintwork. Damaged but functional finishes. Surface cracks that are not structural.

The mortgage broker translating a survey result for a client should help the client understand the categorisation and the likely cost to remedy. A property with significant defects might still be a good buy at the right price — the broker who can negotiate a reduction from the seller equivalent to the remedy cost has earned their fee multiple times over.

When the client is buying off-plan or building, periodic on-site monitoring through the construction period provides early warning of problems.

Quantity surveyors issue stage certificates (foundations complete, blockwork complete, roof on, M&E first fix, M&E second fix, finishes, handover) confirming work done. The lender’s monitoring surveyor verifies these certificates before authorising disbursement of construction loan tranches.

For the buyer in off-plan, periodic visits to site — quarterly is reasonable — give visibility on progress. Photographic records of each visit are valuable evidence if a dispute later arises. Several Nigerian PropTech platforms have launched in 2024-2026 offering construction monitoring services where the buyer pays a fixed fee and the platform provides monthly photo/video updates with QS commentary. Stutern, Buildflow, and a handful of others operate in this space.

Hazardous materials are less prominent in Nigerian property practice than in older European or American markets, but they are not absent.

Asbestos was used in roofing sheets and some insulation products into the early 1980s. Buildings constructed before 1990 may contain asbestos cement sheeting. Removal requires specialist contractors and is regulated under NESREA (National Environmental Standards and Regulations Enforcement Agency) rules.

Lead paint was common in pre-1990 paint formulations. Modern Nigerian paints are largely lead-free, but old buildings still have lead-based finishes. This is mostly a health risk during renovation rather than a routine concern.

Radon is not a recognised issue in Nigerian housing.

Damp and mould are major concerns. The humidity in coastal Nigeria (Lagos, Port Harcourt, Calabar) combined with poor ventilation and water ingress creates conditions where mould flourishes. Some Lagos flats are made effectively uninhabitable by black mould that cannot be removed without significant remediation.

For mortgage purposes a property with active mould is a problem. The valuer will note it. The lender may require remediation as a condition precedent to disbursement. The broker should flag the issue early.

Every property condition assessment generates documentation: the surveyor’s report, the lender’s valuation report, photographs, test results from material testing, certificates of completion, occupancy permits, fire safety inspections, lift inspection certificates if applicable.

This documentation matters at three points: at acquisition (it informs the buy decision and the negotiating position), during ownership (it is the baseline against which condition can be tracked), and at eventual sale or refinance (it is evidence of the property’s condition history).

A brokerage maintaining proper client records — as IMBL requires — should hold this documentation for each transaction. Cloud-based document storage with version control has largely replaced paper files in serious brokerages. Backed-up, retention-policy-compliant storage is now table stakes.

Construction quality in Nigeria continues to be a credit risk despite the National Building Code framework. The Ikoyi collapse and subsequent incidents underline the reality that approvals do not guarantee safety, that material quality varies, and that buyers and lenders must independently verify condition rather than rely on the regulatory chain. Pre-purchase surveys, lender valuations (which are not the same as building surveys), and construction monitoring all play roles in managing this risk.

Defects fall into categories — major structural, significant, minor — that affect mortgageability and value differently. Hazardous materials are less common than in older markets but mould and damp are real issues. Documentation discipline through acquisition, ownership, and resale is the broker’s friend.

1. Name three categories of construction failure (design, materials, execution) and give one specific example of each from Nigerian practice.
2. Explain the difference between a lender’s valuation report and an independent building survey. When should a client commission the latter?
3. What is BS 8110 and how does it relate to current Nigerian engineering practice?
4. List five elements a building survey should cover and the typical cost range for a Lagos residential survey.
5. Why does damp and mould merit specific attention in coastal Nigerian markets?

Your client is considering a four-bedroom semi-detached duplex in Magodo, Lagos, listed at ₦68M. The property is 18 years old. During the inspection visit the client noticed step-cracks along the south wall, a slightly out-of-plumb roof line, and visible damp on the bathroom walls. The seller is willing to negotiate, citing “minor maintenance issues.”

Discussion: What pre-purchase survey would you recommend? What specialists should be involved? How would you advise the client to use the survey findings in negotiations? At what point would the defects make the property uninsurable or unmortgageable?

A client is buying off-plan in a 60-unit estate being developed in Sangotedo by a mid-sized developer. The unit is a three-bedroom terrace at ₦42M, with 30% paid as deposit at signing and the balance due across 12 monthly instalments tied to construction milestones. The client is asking how they can monitor construction quality given they live in Ibadan and cannot visit the site weekly.

Discussion: What construction monitoring approach would you recommend? Which professionals or platforms could be engaged? What documentation should the client be receiving as part of the milestone certification process? How does monitoring tie into the mortgage disbursement schedule?

— End of Lesson 9 —

Next: Lesson 10 — Sustainable Housing, Environmental Risk, and Green Mortgage Practice