Two quotes for the same driveway can differ by more than £100, even when the volume, delivery date and supplier look identical. The difference often comes down to two characters on the order form: the grade. UK construction material prices in 2025 stood at more than double their 2005 level, making it more important than ever to know exactly what you pay for at each grade.
Yes, concrete grade affects ready mix concrete cost, with prices rising from about £95 per cubic metre for C10 to around £160 for C40 because stronger mixes need more cement.
The grade is only one part of the final ready mix concrete cost, though. Volume, delivery, access and pumping all add to the bill, and choosing the wrong grade can cost far more than the price gap between mixes. We help customers across London match the grade to the job before they order, which keeps both the budget and the build on track.
Ready Mix Concrete Cost by Grade
Prices climb steadily as the grade rises. The table below shows typical London prices per cubic metre before VAT, alongside the jobs each grade usually suits.
| Grade | Typical Price per m³ | Common Uses |
| C10 | £95 to £110 | Blinding, kerb bedding, non-structural fill |
| C15 | £100 to £115 | Pathways, shed bases, light house floors |
| C20 | £100 to £120 | Domestic floors, garage bases, light foundations |
| C25 | £110 to £125 | Foundations, footings, ground-bearing slabs |
| C30 | £120 to £135 | Driveways, reinforced slabs, external paving |
| C35 | £125 to £145 | Structural frames, heavy-duty floors, piling |
| C40 | £140 to £160 | Commercial structures, high-load and exposed work |
These figures cover the concrete itself. Delivery, part-load charges, pumping and VAT sit on top of the grade price, and each one is covered further down.
Reasons Higher Grades Cost More
Stronger concrete uses more of the most expensive ingredient and needs tighter control at the batching plant. These are the main reasons the price rises with the grade.
More Cement per Cubic Metre
Cement is the costliest part of any concrete mix, and strength depends heavily on the amount used. A typical RC28/35 mix assumes about 325 kg of cementitious content per cubic metre, far more than a light general-purpose mix. As a result, every step up in grade adds cement, and the price per cubic metre rises with it.
Tighter Mix Design and Quality Control
Higher grades leave less room for error. The water content must stay low, the aggregates must be well graded, and the batching must be precise to reach the target strength. Plants also carry out more testing on structural mixes, which adds to the production cost.
Admixtures for Strength and Workability
Stronger mixes often need chemical admixtures to stay workable. Low-water mixes can become stiff, and plasticisers help the concrete flow into formwork without adding water that would weaken it. Retarders, accelerators, and waterproofing additives can also be added for specific site conditions.
These extras improve performance, but they also raise the price per cubic metre. Higher grades use them more often, which widens the cost gap between light and structural concrete.
Real Price Gap of a Grade Upgrade
The difference between grades looks large on a price list, but the real effect on a project is often smaller than expected. On a typical domestic pour, moving up one or two grades usually adds a modest amount compared with the total job cost.
Budget Example
For a 10 m³ ground-bearing slab, C25 at around £118 per m³ costs about £1,180. The same slab in C30 at around £128 per m³ costs about £1,280, and in C35 at around £135 per m³ about £1,350. Moving from C25 to C35 adds roughly £170 to the concrete bill before VAT.
Set against excavation, labour, reinforcement and pumping, that difference is small. For this reason, the grade decision should be led by the job’s structural needs, not by the price gap alone.
Cost Risks of the Wrong Grade
Choosing a grade affects much more than the invoice. Both over-specifying and under-specifying carry real costs.
Paying for Strength the Job Does Not Need
Ordering a higher grade than the job requires adds cost with no practical benefit. Structural engineers note that concrete is often given far more strength than the design needs, mainly because cement contents run higher than necessary. A garden path or shed base gains nothing from C35, while the extra cement raises both the price and the carbon footprint.
Saving Money on a Grade That Falls Short
Under-specifying carries the bigger risk. A grade too weak for the load or exposure can crack, scale or fail inspection, and fixing it means breaking out and replacing the concrete. The cost of that repair will far exceed the small saving made at the ordering stage.
Building Control and structural engineers often set a minimum grade for foundations, reinforced slabs and external surfaces. Following that specification protects the project and avoids expensive rework.
Choosing between two grades is easier with expert input. Tell Pro-Mix Concrete what you are building, along with the ground conditions and any engineer’s specification, and our team will confirm the right grade before you place an order.
Other Factors Behind Ready Mix Concrete Cost
Grade sets the base price, but several other factors shape the final bill. These are the main ones to budget for:
- Order volume: Small orders below a full load often carry a part-load charge, which raises the price per cubic metre.
- Delivery distance: Sites farther from the batching plant cost more to supply, and central London deliveries often carry higher rates.
- Site access: Narrow streets, rear gardens and upper floors may need a line or boom pump, which adds a separate hire charge.
- Waiting time: Trucks held on site beyond the agreed unloading window can incur hourly waiting charges.
- Additives and fibres: Fibre reinforcement, waterproofing and rapid-set admixtures add to the price per cubic metre.
- VAT: Concrete supplied on its own is usually standard-rated at 20%, while materials a builder installs in a qualifying new dwelling can be zero-rated.
Comparing quotes on a like-for-like basis means checking all of these items, not just the grade price. Two quotes with similar per-metre rates can end up far apart once delivery, pumping and waiting time are added.
Ways to Control Cost Without Lowering the Grade
Cutting the grade is rarely the right way to save money. These steps reduce the ready-mix concrete cost while keeping the specification intact:
- Measure accurately and allow a sensible 5% to 10% margin
- Order full loads where possible to avoid part-load charges
- Prepare clear access before the truck arrives
- Book concrete and pump hire together for one schedule
- Confirm the grade with an engineer before ordering
- Avoid adding admixtures the job does not need
Small planning decisions like these often save more than dropping a grade would. They also protect the strength and durability the project depends on.
Ordering Note
Have your volume, grade, site address and access details ready before calling for a quote. Accurate information leads to an accurate price and avoids surprise charges on the day.
Is designated concrete cheaper than designed concrete?
Designated mixes such as GEN, RC and PAV are often cheaper because they follow standard recipes. Designed mixes are tailored to a specific performance requirement, which adds design and testing work. Most domestic projects suit designated concrete.
Does adding fibres change the grade of concrete?
Fibres do not change the strength grade. They help control early shrinkage cracking and can reduce the need for steel mesh in some slabs. Fibres add to the price per cubic metre but may lower overall reinforcement costs.
Is VAT charged on ready mix concrete in the UK?
Concrete supplied on its own is usually charged at the standard VAT rate of 20%. Concrete a builder installs in a qualifying new dwelling can be zero-rated. Check the VAT position with your supplier or accountant before ordering.
Why does ready mix concrete cost more in London?
London prices reflect longer delivery times, traffic, congestion charges, restricted access and higher operating costs. Many sites also need pumps or smaller loads, which add charges. Outer areas with easier access usually cost less per cubic metre.
Can you get a discount on large concrete orders?
Many suppliers offer better rates on large or repeat orders because full loads cost less to deliver. Booking several loads for the same day can also reduce delivery charges. Ask for a volume quote when ordering more than a few loads.
Ordering the Right Grade at the Right Price
Concrete grade has a clear effect on price, with higher grades costing more because they need more cement, tighter control and extra admixtures. On a typical domestic pour, the gap between grades is usually modest compared with the total project cost. Over-specifying adds cost without benefit, while under-specifying risks expensive repairs. Delivery, access, pumping and VAT also shape the final ready-mix concrete cost, which makes a full like-for-like quote the best way to compare suppliers.
We supply every grade from C10 to C40 across London, delivered ready-mixed or mixed fresh on site, with pumps available for difficult access. Our team checks the grade against your project before the first load is batched, so the concrete arriving on site matches the job it needs to do.
Work out your volume with our free online concrete calculator, then call the Pro-Mix Concrete team on 0800 772 3808 for a clear quote on the grade your project needs. One call covers the concrete, the delivery and the pump.
- Dennis Broderick is the founder and owner of Pro-Mix Concrete Company, a trusted name in ready-mix concrete solutions across the UK. With over 20 years of hands-on experience in the construction and concrete industry, Dennis brings unmatched expertise, practical insights, and a commitment to quality on every project - from residential driveways to large-scale commercial developments.
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