How Many Bags of Cement to Build a 3-Bedroom House in Nigeria?

Understanding Cement Consumption in Nigerian Construction

Cement is the most indispensable construction material and often the most under-budgeted. Unlike blocks or roofing sheets where you can count units, cement consumption is less intuitive — it depends on mix ratios, surface area, thickness, and the skill of your artisans. Over-rich mixes waste cement; under-rich mixes produce weak structures that fail prematurely.

This guide provides both theoretical calculations and real-world benchmarks so you can accurately estimate your cement requirement, plan your purchases, and avoid mid-project shortages or over-buying.

Stage-by-Stage Cement Consumption: 3-Bedroom Bungalow

Stage 1: Foundation Concrete

Standard strip foundation concrete uses a 1:2:4 mix (1 cement : 2 sharp sand : 4 granite). For a 3-bedroom bungalow with a strip foundation approximately 500mm wide × 300mm deep on a 44-linear-metre perimeter:

Foundation concrete volume = 44 × 0.5 × 0.3 = 6.6 cubic metres

At 1:2:4 mix: approximately 6 bags of cement per cubic metre = 40–50 bags

For raft foundations (common in Lagos), the slab volume is much larger: a 100 sqm raft at 250mm thickness = 25 cubic metres = 120–150 bags

Stage 2: Foundation Block Laying Mortar

Mortar for block laying uses a 1:6 mix (1 cement : 6 sharp sand). Each 9-inch block requires approximately 0.003–0.004 cubic metres of mortar for bed and perpend joints. For 500 foundation-level blocks:

Cement required: 15–20 bags

Stage 3: Superstructure Block Work (Ground to Ring Beam)

For approximately 2,800 blocks above ground (external + internal walls combined):

Cement required: 55–80 bags

Stage 4: Columns and Ring Beam Concrete

A typical 3-bedroom bungalow has 12–16 columns (each 225×225mm, 3m high) and a full-perimeter ring beam. Column and beam concrete uses a 1:1.5:3 structural mix:

Cement required: 25–40 bags

Stage 5: German Floor or Ground Floor Slab

A 100 sqm ground floor slab at 150mm thickness = 15 cubic metres at 1:2:4 mix:

Cement required: 40–55 bags

Some builders use a German floor (dense compacted laterite with a thin screed rather than a full concrete slab) which uses significantly less cement — approximately 15–20 bags for the screed alone.

Stage 6: Lintels Over Doors and Windows

Each cast-in-situ lintel uses 0.5–1 bag of cement depending on span. For 15–20 openings:

Cement required: 8–18 bags

Stage 7: Internal and External Plastering

Plaster uses a 1:5 cement-sand mix at 12–15mm thickness. Total plaster area for a 3-bedroom bungalow (both faces of all walls) = 420–560 sqm.

At 1.5 bags per 10 sqm: Cement required: 60–85 bags

Stage 8: Floor Screed (Preparation for Tiling)

A 50–75mm floor screed at 1:4 mix over 100 sqm floor area:

Cement required: 18–28 bags

Stage 9: Tile Adhesive and Pointing

Tile adhesive mortar at 1:4 mix for 200 sqm of tiling:

Cement required: 12–20 bags

Summary: Total Cement Requirement

Rule of thumb: budget for 350–450 bags for a standard strip-foundation 3-bedroom bungalow, or 420–500 bags for a raft foundation version. This includes a reasonable wastage allowance.

Cement Cost at 2025 Prices

Cement Purchasing and Storage Tips

• Never buy more than 3 months' supply at once. Cement loses strength progressively during storage. After 3 months in Nigerian humidity conditions, 15–25% of strength may be lost.
• Store on wooden pallets — never directly on bare concrete or earth, where moisture wicks up from below.
• Cover with waterproof tarpaulin but allow some ventilation to prevent condensation buildup inside the stack.
• Rotate stock FIFO — first in, first out. Use older bags first.
• Check bag weight on delivery — short-weight bags are common from unscrupulous suppliers. A standard bag should weigh 50kg.
• Test each batch if in doubt: Mix a small sample at 1:3 and check it sets hard and does not crumble within 24 hours.