A 4-bedroom duplex in Nigeria typically needs 6,000 to 9,000 blocks — far more than a bungalow because it walls two floors plus the staircase core. You’ll also need roughly 1,000–1,500 bags of cement across the blockwork. At 2026 prices, the blocks alone come to about ₦2.7M–₦6.3M. The exact count depends on your drawings, but this gives you a reliable planning figure. (Current as of July 2026.)
A 4-bedroom duplex is the sweet spot for many Nigerian families and diaspora builders — big enough to live in comfortably, not as heavy as a 5-bedroom. Here’s how many blocks it takes, how that’s worked out, and the 2026 cost.
How many blocks does a 4-bedroom duplex need?
Plan for 6,000 to 9,000 blocks. As a two-storey building, it carries roughly double the wall load of a single-floor house of similar size, plus the staircase core, boundary and internal partitions. A compact design sits near 6,000; a large duplex with a boys’ quarters, thick external walls and high ceilings pushes toward 9,000 or beyond.
Worth knowing: The precise number comes from a quantity take-off — total wall area divided by blocks per square metre (about 10 blocks per m² for 9-inch blocks). Use the ranges here to plan and budget; use your surveyor’s figure to order.
Blocks by building type (for comparison)
| Building type | Approx. blocks needed |
|---|---|
| 3-bedroom bungalow | 2,600–3,200 |
| 3-bedroom flat | 2,700–3,600 |
| 4-bedroom duplex | 6,000–9,000 |
| 5-bedroom duplex | 8,000–12,000 |
What the blocks will cost in 2026
Block prices move with cement, so treat this as a current snapshot. In mid-2026, moulded blocks commonly run about ₦450–₦700 each depending on type, location and whether you buy commercially or mould on site.
| Blocks | At ₦450 each | At ₦700 each |
|---|---|---|
| 6,000 | ₦2,700,000 | ₦4,200,000 |
| 7,500 | ₦3,375,000 | ₦5,250,000 |
| 9,000 | ₦4,050,000 | ₦6,300,000 |
For current block, cement and rod prices, see our Construction Cost Tracker.
Costing the whole duplex? See the full stage-by-stage cost of building a 4-bedroom duplex in Lagos, and every price in the complete cost library.
Watch out: Order in planned batches but lock your price — builders who under-estimate buy the final thousands of blocks at peak market rates. A take-off from your drawings prevents both over- and under-ordering.
Frequently asked questions
How many blocks for a 4-bedroom duplex in Nigeria?
Roughly 6,000–9,000 blocks. A duplex needs far more than a bungalow because it walls two floors plus a staircase core. Your exact number comes from a take-off based on your drawings.
How many bags of cement for a 4-bedroom duplex?
Around 1,000–1,500 bags across blockwork, setting and rendering. Foundation, decking and finishing add their own cement requirements.
How much do the blocks cost?
At about ₦450–₦700 per block in 2026, 6,000–9,000 blocks come to roughly ₦2.7M–₦6.3M. Confirm the current price before ordering.
How many blocks for a 5-bedroom duplex instead?
A 5-bedroom duplex needs more — roughly 8,000–12,000 blocks. See our dedicated guide on how many blocks to build a 5-bedroom duplex.
Sources & method: Block-count and cement ranges from Nigerian construction estimating sources (2025–2026); pricing from current market. Estimates only — a quantity surveyor’s take-off gives the exact figure. Last updated: July 2026. Journalists and researchers may cite this with attribution to LandsofNigeria.com.
