🇬🇧 United Kingdom · Cement · Updated 2026
How much cement do you need to build a house in the United Kingdom?
A 150 m² single-storey house in the United Kingdom needs roughly 335 bags (50 kg) of cement — about 2.23 bags (50 kg) per m² of floor area. That is computed from United Kingdom construction conventions: 1:4 mortar, 1:2:4 concrete, and 12 mm internal plaster, including the local wastage allowance.
Cement quantities for a house in the United Kingdom, computed from how buildings are actually put up here rather than from a global average. The tables below run from a small 50 m² dwelling to a 400 m² family home, and the method section shows how to reproduce every figure by hand so you can adapt it to your own plan.
Cement by house size in United Kingdom
| Floor area | Cement required | Per m² of floor |
|---|---|---|
| 50 m² | 138 bags (50 kg) | 2.76 |
| 75 m² | 190 bags (50 kg) | 2.53 |
| 100 m² | 240 bags (50 kg) | 2.40 |
| 150 m² | 335 bags (50 kg) | 2.23 |
| 200 m² | 427 bags (50 kg) | 2.13 |
| 250 m² | 519 bags (50 kg) | 2.08 |
| 300 m² | 607 bags (50 kg) | 2.02 |
| 400 m² | 782 bags (50 kg) | 1.96 |
Single-storey. The per-m² rate falls as the house grows — a small house has more wall and roof per square metre of floor than a large one, which is why these are computed size by size rather than scaled from a single rate.
Where it goes — 150 m² house
Mortar cement 5.3 m³ mortar at 1:4 | 41 bags (50 kg) |
Cement — general concrete Footings and blinding, 12 m³ | 76 bags (50 kg) |
Cement — structural concrete Slabs, 15 m³ at 1:1.5:3 | 121 bags (50 kg) |
Cement — plaster 15 mm external, 12 mm internal, 1:4 | 40 bags (50 kg) |
Floor screed cement 40 mm screed at 1:3 | 57 bags (50 kg) |
What drives the quantity in United Kingdom
| Factor | Local value | Effect |
|---|---|---|
| Mortar mix | 1:4 | A richer mortar burns cement fast — going from 1:6 to 1:4 raises the mortar cement bill by roughly half. |
| General concrete mix | 1:2:4 | Footings and blinding. The leanest mix on the job and usually the largest concrete volume. |
| Structural concrete mix | 1:1.5:3 | Slabs, beams and columns. Richer, and non-negotiable — this is the mix an engineer specifies. |
| Plaster mix | 1:4 | Applied 15 mm externally and 12 mm internally here. |
| Screed mix | 1:3 | At 40 mm thick over the whole floor area. |
How to calculate it yourself
- 01
Work out each wet volume first: mortar, concrete, plaster and screed are all calculated separately because they use different mixes.
- 02
Multiply the wet volume by the dry factor — 1.54 for concrete, 1.33 for mortar and plaster — because dry materials lose volume once mixed and compacted.
- 03
Split the dry volume by the mix parts. For a 1:2:4 concrete that is 1 part in 7.
- 04
Convert the cement volume to mass at about 1,440 kg/m³, then divide by 50 to get bags.
- 05
Round up per delivery, never per calculation — part bags left open on site go hard and are wasted.
Buying and site notes
- —Cement has a shelf life. Bags stored more than about three months, or anywhere damp, lose strength — order to the pour, not to the whole job.
- —Stack bags off the ground on timber and no more than eight high, or the bottom bags compact into unusable lumps.
- —Buy from one manufacturer for the whole structure where you can: strength classes vary between brands and mixing them makes results inconsistent.
Get every material measured off your own plan
This page works from a representative footprint. Upload your dimensioned drawings and get the full schedule — every material, measured from your real geometry and priced in GBP (£).
Take off my drawingsCement in United Kingdom — frequently asked
How much cement does a house need in the United Kingdom?
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A 150 m² single-storey house in the United Kingdom needs roughly 335 bags (50 kg) of cement — about 2.23 bags (50 kg) per m² of floor area. That is computed from United Kingdom construction conventions: 1:4 mortar, 1:2:4 concrete, and 12 mm internal plaster, including the local wastage allowance.
How much cement per square metre in the United Kingdom?
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About 2.23 bags (50 kg) per m² of floor area for a single-storey house. The figure is not linear across sizes — a small house has proportionally more wall and roof per m² of floor than a large one, which is why the table above is computed size by size rather than scaled from one rate.
What changes the quantity of cement needed?
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Mortar mix (1:4) — A richer mortar burns cement fast — going from 1:6 to 1:4 raises the mortar cement bill by roughly half. General concrete mix (1:2:4) — Footings and blinding. The leanest mix on the job and usually the largest concrete volume. Structural concrete mix (1:1.5:3) — Slabs, beams and columns. Richer, and non-negotiable — this is the mix an engineer specifies.
Is wastage included?
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Where it applies, yes — a 5% allowance is carried on the perishable materials (walling units, tiles, paint). Bulk materials like sand and stone carry handling loss instead. Ordering the theoretical quantity with no allowance reliably means a second delivery at a worse price.
How accurate is this for my own house?
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It is a planning quantity derived from a representative rectangular footprint, so it is the right order of magnitude and internally consistent — good for budgeting and for checking a supplier's list. It is not a measured takeoff of your plan. Upload your dimensioned drawings to get quantities measured off your real geometry and priced in GBP.
Are cement prices included?
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No, deliberately. Material prices in the United Kingdom move week to week and vary by region, so a price printed on a static page would be wrong within a month. This page gives you the quantity — take that to two or three local suppliers and the price will be current and competitive.