Cost of Building a Duplex in Nigeria: City-by-City Breakdown

Last Updated: July 2026

The cost of building a duplex in Nigeria now varies sharply by city, finish level, and material choice, with a standard 4-bedroom duplex often landing in the broad range of ₦52 million to ₦98 million depending on location and specification.

Current market trackers also show cement around ₦9,500 per 50kg bag nationally, while branded bags such as Dangote, BUA, and Lafarge are often higher in dealer surveys.

What Drives Duplex Cost

A duplex costs more than a bungalow because you are paying for a suspended slab, heavier reinforcement, more columns, stairs, and more complex labour sequencing. A suspended slab alone can run about ₦35,000 to ₦75,000 per square metre in Nigeria depending on city and specification. That is why two projects with the same floor area can end up with very different totals.

The biggest cost drivers are usually:

• Foundation type and soil condition.
• Structural concrete and reinforcement.
• Roofing design and material grade.
• Finishes such as tiles, POP, doors, kitchens, and sanitary ware.
• City-specific labour and logistics costs.

Current Material Prices

Building-material price data in Nigeria shows cement at about ₦9,500 per 50kg bag, 12mm iron rod around ₦9,800 per length, 9-inch blocks in Lagos around ₦750 each, and 6-inch blocks around ₦550 each. Other frequently used inputs include sharp sand at about ₦4,500 per tonne, granite at about ₦8,500 per tonne, and long-span aluminium roofing sheets at about ₦7,500 per square metre.

City-by-City Breakdown

For a standard duplex, Lagos usually sits at the top end because of labour, logistics, and market pricing, while Ibadan and some other southern inland cities often come in lower. Abuja usually sits below Lagos but above many lower-cost markets because of land-development standards and labour pricing. Port Harcourt often tracks close to Abuja, with site conditions and logistics affecting the final figure.

Lagos Versus Abuja

A common question is how much it costs to build a 3-bedroom duplex in Lagos versus Abuja, but the same cost logic applies to a 4-bedroom or standard family duplex: Lagos usually carries higher material delivery and labour pressure, while Abuja often has slightly lower pricing on some trades but still stays above many smaller markets. For a standard fully detached duplex, the reported cost bands are higher in Lagos than Abuja across both economy and luxury finishes.

Stage Cost Guide

A duplex budget is easier to understand when broken into stages. Foundation work can absorb a large share of early spending, especially if the soil requires stronger structural treatment. The suspended slab, staircase, roofing, and finishes then determine how quickly the total rises.

Example Budget

If you are estimating a standard 4-bedroom duplex in a city like Abuja or Port Harcourt, a mid-spec build can reasonably be modeled in the broad ₦60 million to ₦85 million range when structure, finishes, and services are all included. In Lagos, the same specification can move upward because blockwork, reinforcement, transport, and trades often price in higher.

For a simpler planning method, I usually separate the estimate into:

1. Substructure and frame.
2. Slab and stairs.
3. Roofing.
4. MEP services.
5. Finishes.
6. External works.

That structure helps you see where the money goes rather than only staring at one final total.

Labour Or Materials

A useful clarification for readers is that many online estimates refer to materials only, while others include labour, transport, and wastage. The all-in figures in the duplex BoQ references above include labour in the quoted work sections, while the material-price tables are unit prices only. That difference is important because a cement-only price check does not equal a complete building budget.

Tax And Business Note

When a building is used wholly for trade or business, the Nigeria Tax Act, 2025 provides for capital allowance on qualifying capital expenditure, and the published schedule includes building expenditure in the qualifying asset classes. For business property budgeting, that means the construction cost may have tax implications in the context of allowable capital expenditure, but treatment depends on the facts and the applicable tax rules.

ToolBase Use

If you want to test different room counts, finishes, or city inputs, ToolBase’s Construction Cost Estimator can help turn these ranges into a more structured projection.
For document handling and project paperwork, the platform’s templates section can also support planning and records management.
ToolBase.com.ng is a free collection of practical online tools and templates built for everyday planning, finance, and construction needs.

References And Sources

The current material figures and city bands in this article are based on Nigerian building-material trackers and duplex cost guides published in 2026. The cement reference point of ₦9,500 per 50kg bag comes from a dated national price tracker, while brand-specific bag prices were also recorded in dealer surveys. The duplex cost bands by city were taken from 2026 breakdowns for standard and fully detached duplexes across Lagos, Abuja, Port Harcourt, and Ibadan. The tax note references the Nigeria Tax Act, 2025 and its capital allowance framework.

This article is for educational purposes only and does not constitute professional advice. Consult a qualified professional for your specific situation.