Ready‑Mix vs Site‑Mixed

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Compare ready-mix concrete and site-mixed concrete for UK projects in 2026. Estimate volume, cost, labour, delivery, pump hire, mixer hire, waste allowance and the best concrete supply method for slabs, footings, bases, paths and foundations.

Ready-Mix vs Site-Mixed Concrete UK — What Is the Difference?

Ready-mix concreteis batched at a concrete plant, loaded into a mixer truck and delivered to site at the required strength, slump and quantity. It is usually the preferred choice for slabs, driveways, garage bases, foundations and any pour where consistency, speed and compliance matter. The supplier controls batching accuracy, mixing time, water content and delivery timing, so the finished concrete is more predictable than a hand-mixed batch.

Site-mixed concreteis made at the property or construction site using cement, ballast or separate aggregates, water and a mixer. It can be mixed by a homeowner, builder or contractor. Some people also use “site-mixed” to describe volumetric concrete trucks, where the ingredients are carried separately and mixed on site immediately before discharge. This page separates those methods clearly because hand-mixed concrete, contractor mixed concrete and volumetric concrete have very different cost, speed and quality profiles.

2026 Practical Rule

For very small quantities under about 0.5m³, dry bags or a small site mixer can be convenient. For 1m³ or more, ready-mix or volumetric delivery often becomes better value once labour, mixer hire, material delivery, waste, fatigue and quality risk are included.

Ready-Mix Concrete

Best for larger pours, structural jobs, time-sensitive work, reinforced slabs, driveway slabs, footings and any project where a consistent BS 8500-style specification is important.

Site-Mixed Concrete

Best for small repairs, fence posts, kerb bedding, awkward access, remote locations, staged work or situations where a delivery truck cannot reach the property.

Cost Is Not Only £/m³

The real comparison includes labour, time, waste, delivery fees, pump hire, partial-load charges, mixer hire, material storage, weather risk and the cost of a failed pour.

Ready-Mix vs Site-Mixed Concrete — 2026 UK Comparison

The table below summarises the practical differences between delivered ready-mix and concrete mixed on site. The right choice depends on the size of the pour, the required strength grade, access, budget, labour available and whether the concrete is structural or non-structural.

  • Factor: Best Use; Ready-Mix Concrete: Slabs, footings, driveways, garage bases, structural work; Site-Mixed Concrete: Small repairs, posts, kerbs, short staged work; Volumetric / Mixed-On-Site Truck: Variable volumes, multiple mixes, uncertain final quantity
  • Factor: Typical Volume; Ready-Mix Concrete: 0.5m³ to large pours depending on supplier; Site-Mixed Concrete: 0.05m³ to 1m³ practical for most domestic users; Volumetric / Mixed-On-Site Truck: Small to medium pours where paying only for used material helps
  • Factor: Quality Control; Ready-Mix Concrete: Highest plant batching and delivery records; Site-Mixed Concrete: Variable depends on water, ratios and mixing time; Volumetric / Mixed-On-Site Truck: Good supplier calibrated equipment
  • Factor: Labour Required; Ready-Mix Concrete: Low if direct discharge; medium with barrows; low with pump; Site-Mixed Concrete: High — loading, mixing, barrowing, placing, cleaning; Volumetric / Mixed-On-Site Truck: Medium — similar placing labour to ready-mix
  • Factor: Main Cost Risk; Ready-Mix Concrete: Part-load charge, waiting time, pump hire; Site-Mixed Concrete: Slow labour, wasted materials, inconsistent mix; Volumetric / Mixed-On-Site Truck: Higher availability cost, travel, minimum call-out
  • Factor: Best Verdict; Ready-Mix Concrete: Best for most 1m³+ UK concrete pours; Site-Mixed Concrete: Best for small jobs where convenience matters; Volumetric / Mixed-On-Site Truck: Best when exact quantity is uncertain

Ready-Mix Concrete Cost vs Site-Mixed Concrete Cost UK 2026

Concrete prices in the UK are affected by cement, aggregates, energy, haulage, driver availability, plant distance, minimum load rules, waiting time, pump hire and regional labour costs. The cheapest headline figure is not always the cheapest completed job. A £130/m³ ready-mix quote can become expensive if you need a pump and only order a tiny part-load, while a seemingly cheap site-mix option can become costly if two workers spend a full day mixing and barrowing concrete.

For 2026 budgeting, treat the numbers below as planning ranges rather than fixed quotes. Local suppliers may be cheaper or more expensive depending on plant location, load size, delivery distance, access and whether you need a certified mix. Always obtain written quotes that state the grade, volume, delivery method, waiting time allowance, VAT status and any part-load fees.

VAT and Minimum Loads

Many online price examples exclude VAT, pump hire and part-load charges. A small 0.6m³ delivery can sometimes cost almost as much as 1m³ once dispatch, driver time and truck operating costs are included. Always compare the final delivered price, not only the advertised price per cubic metre.

  • Supply Method: Ready-Mix Concrete; 2026 Planning Range: £120–£220/m³ before complex extras; What It Includes: Plant-batched concrete delivered by mixer truck; Watch Out For: Part-load fee, waiting time, pump/barrow labour
  • Supply Method: Volumetric Mixed-On-Site; 2026 Planning Range: £130–£230/m³ equivalent; What It Includes: Ingredients mixed on site, pay-for-used volume often available; Watch Out For: Availability, access, call-out and calibration/specification checks
  • Supply Method: Cement + Ballast Site Mix; 2026 Planning Range: £150–£260/m³ equivalent once labour is counted; What It Includes: Cement, ballast, water, mixer hire and manual labour; Watch Out For: Slow production, inconsistent water content, fatigue
  • Supply Method: Ready-Mixed Dry Bags; 2026 Planning Range: Usually highest per m³; What It Includes: Pre-blended dry material, just add water; Watch Out For: Very high bag count for slabs; heavy manual handling

Cost-Saving Tip

Measure carefully, add a sensible waste allowance and ask suppliers for both a ready-mix quote and a volumetric/mixed-on-site quote. For uncertain excavations such as footings, volumetric supply can reduce over-ordering because the truck only mixes what is used.

Quality, Strength and Standards — Why the Supply Method Matters

Concrete is not just grey material that hardens. It is an engineered construction product where strength, durability and workability depend on cement content, aggregate grading, water/cement ratio, admixtures, compaction, curing and temperature. In the UK, concrete specification is normally aligned withBS 8500 and BS EN 206 context, especially when the concrete is structural or needs defined durability.

Ready-mix concrete generally gives better consistency because the batching process is controlled at a plant. The supplier can provide a named grade, delivery ticket and mix information. That matters for footings, reinforced slabs, garage bases, driveways, external paving exposed to freeze-thaw risk and any project inspected by Building Control. Site-mixed concrete can still be perfectly suitable for non-critical work, but the person mixing must control the batch ratios carefully and avoid adding excessive water just to make placement easier.

Batching Records

Ready-mix suppliers normally provide a delivery ticket showing volume, grade, time and mix details. That record is useful for contractors, clients and Building Control queries.

Water/Cement Ratio

Adding too much water weakens concrete and increases shrinkage. Site mixing often fails because water is added by eye rather than controlled consistently.

Designed Mixes

Structural or exposure-class concrete should be specified properly. For complex projects, confirm the grade with an engineer, supplier or Building Control officer.

Concrete Grades Commonly Compared

  • C10 / GEN1:blinding, kerb bedding, non-structural fill and light domestic use.
  • C20 / GEN3:light slabs, shed bases, paths and domestic hardstandings where loads are modest.
  • C25 / ST2:domestic footings, strip foundations and garage bases where specified by the designer or Building Control.
  • C30 / PAV1:driveways, external slabs and areas exposed to cars, light vans and weather.
  • C35–C40:reinforced slabs, heavier structural applications and engineered designs.

Do Not Guess Structural Concrete

If the concrete supports a building, retaining structure, heavy vehicle load or reinforced element, do not choose a mix grade by price alone. Use the specification from your drawings, structural engineer, supplier or Building Control notice.

When Ready-Mix Concrete Is Usually the Better Choice

Ready-mix concrete is usually the better option when the pour is large enough to justify delivery, when timing matters, when the concrete grade must be consistent and when the job would be physically exhausting or slow to mix by hand. Even a modest 3m × 4m slab at 100mm thick is 1.2m³ before waste. That is more than two tonnes of wet concrete and can require dozens or hundreds of individual shovel loads if mixed manually.

Ready-mix also reduces the risk of cold joints. A cold joint occurs when one batch begins to set before the next batch is placed and compacted against it. With site-mixing, this can happen on slabs because the first mix is already stiffening while the next batch is still being loaded into the mixer. Ready-mix allows continuous placement, especially when combined with a pump or enough people to rake, tamp and finish the surface quickly.

Garage Bases & Slabs

Ready-mix provides consistent strength and faster placement across the whole slab, reducing cold-joint risk and finishing problems.

Driveways

Driveway concrete benefits from controlled strength, lower water content and faster placement because vehicle loads expose weak concrete quickly.

Foundations

Footings often need a specified grade and a fast pour. Ready-mix or volumetric supply is usually easier to coordinate with inspections.

Ready-Mix Advantages

  • Faster placement:large volumes can be discharged in minutes rather than hours.
  • Better consistency:batching is controlled by the plant or supplier rather than shovel counts.
  • Lower labour:fewer people are needed if chute access or a pump is available.
  • Cleaner site:fewer bulk bags, cement sacks, mixer washout areas and unused material piles.
  • Better for specified grades:easier to order C20, C25, C30, RC mixes or PAV mixes with supplier guidance.

When Site-Mixed Concrete Can Be Better

Site-mixed concrete still has a place in UK building work. It is useful where the quantity is tiny, the site is too awkward for delivery, the work is staged over several days, or the concrete is not structurally critical. For example, a few fence posts, a small repair patch, a kerb haunch, a drain surround or a very small path repair may not justify booking a mixer truck.

The key is to stay realistic about time and physical effort. A Belle-style mixer typically produces small batches, and each batch needs materials loaded, water controlled, concrete discharged, barrowed, placed and the mixer cleaned. For a larger slab, a small site mixer can become the bottleneck. The first concrete begins to set while the last concrete is still being mixed, making it difficult to achieve a consistent finish.

Biggest Site-Mix Mistake

The most common problem is adding too much water. Wet concrete feels easier to place, but excess water reduces strength, increases shrinkage, encourages dusting and can shorten the service life of slabs and external paving.

Site-Mixed Concrete Is Sensible For

  • Fence post holes, gate posts and small garden structures.
  • Small repair patches where a truck delivery would be uneconomic.
  • Remote rural sites where delivery charges are high or access is limited.
  • Low-risk non-structural work such as haunching, bedding and small infill sections.
  • Projects where materials are already on site and labour cost is not the main concern.

Site-Mixed Concrete Is Risky For

  • Large slabs where consistent finish and continuous placement matter.
  • Structural footings or reinforced concrete without a clear specification.
  • Driveways carrying vehicles unless mix control and compaction are excellent.
  • Cold weather pours where slow mixing extends exposure time.
  • Projects where delayed placement could create cold joints or uneven strength.

Delivery, Access, Pump Hire and Labour Planning

The supply choice is often decided by access rather than by raw material price. If a ready-mix truck can reverse close to the pour and discharge directly by chute, delivered concrete is usually fast and economical. If the lorry must park on the road and the concrete needs to travel 30 metres through a narrow side path, costs and risks change. You may need extra labour, a line pump, permission to occupy the highway or a smaller mini-mix lorry.

Pump hire can look expensive at first, but it can save time and reduce labour on awkward sites. A line pump may be the most practical option for rear extensions, garden rooms, terraced properties and pours behind the house. A boom pump is normally used for larger or more obstructed sites where the pump arm needs to reach over obstacles. For simple front driveways and garage bases, direct chute discharge or barrow-in labour may be enough.

Direct Chute

Lowest placement cost if the lorry can get close. Check chute reach, ground stability, overhead cables and whether the truck can turn safely.

Barrow-In

Works for small pours but needs enough labour. Waiting time charges can apply if the truck is held on site too long.

Concrete Pump

Useful for restricted access, rear gardens, extensions and long carries. Budget for pump setup, washout area and minimum hire charge.

Before Booking

Confirm exact volume, grade, slump/workability, delivery time, access route, standing position, washout plan, cancellation policy, waiting time, VAT and what happens if you need slightly more or slightly less concrete on the day.

Worked Examples — Which Method Wins?

These examples show how the decision changes by project size. They are simplified planning examples, not fixed quotes. Always price your exact postcode, volume, grade, access and delivery method.

Fence Posts — 0.15m³

Site-mixed or bagged concrete usually wins because a ready-mix delivery would be too small and part-load charges would dominate the price.

Shed Base — 0.8m³

Either option can work. Site-mixing is possible but labour-intensive. Mini-mix delivery may be better if access is good and time matters.

Garage Base — 2.5m³

Ready-mix usually wins because it places quickly, gives consistent strength and avoids a long day of batching, barrowing and finishing.

Extension Footings — 4m³+

Ready-mix or volumetric supply is normally preferred. Confirm the grade with drawings and Building Control before ordering.

Awkward Rear Garden Pour

A line pump may make ready-mix practical. Without a pump, site-mixing could be cheaper only if the quantity is small and labour is available.

Unknown Trench Volume

Volumetric mixed-on-site concrete can reduce waste because the supplier can stop when the trench is full rather than forcing a pre-ordered volume.

Site-Mixed Concrete Ratios, Batching and Practical Control

When comparing ready-mix with site-mixed concrete, the most important technical difference is batching control. A ready-mix plant weighs and measures the ingredients consistently. On a small domestic site, the mix is often measured by shovel, bucket or part-filled bag, and the water is added until the concrete “looks right”. That method can work for low-risk jobs, but it creates variation from batch to batch. One batch may be stiff and strong, while the next may be wetter, weaker and more prone to shrinkage.

For traditional site mixing, many builders talk in ratio terms such as 1:5 cement to ballast for general concrete, or 1:4 for stronger small-batch work. These ratios are only rough guidance because the actual strength depends on ballast grading, moisture content, cement type, compaction, curing and water control. If you are mixing by volume, keep every batch identical: use the same bucket, same number of measures, same water method and same mixing time. Do not allow one worker to mix “by eye” while another worker places the concrete; that is how uneven slabs and weak patches happen.

Ratio Guidance Is Not a Structural Specification

For structural concrete, reinforced slabs, foundations, retaining walls or work inspected by Building Control, do not rely on generic 1:4 or 1:5 site-mix ratios. Use the specified concrete grade and confirm with your supplier, engineer or inspector.

  • Job Type: Fence posts / small repairs; Site-Mix Suitability: Good; Ready-Mix Suitability: Often uneconomic; Key Control Point: Keep water controlled and compact around posts
  • Job Type: Shed base / small slab; Site-Mix Suitability: Possible; Ready-Mix Suitability: Often better; Key Control Point: Place continuously and finish before setting starts
  • Job Type: Driveway / garage base; Site-Mix Suitability: Risky; Ready-Mix Suitability: Recommended; Key Control Point: Use correct grade, compaction, joints and curing
  • Job Type: Foundations / structural concrete; Site-Mix Suitability: Only if specified and controlled; Ready-Mix Suitability: Preferred; Key Control Point: Follow drawings and Building Control requirements

Decision Checklist — Choose Ready-Mix or Site-Mixed Concrete

Use this checklist before ordering. The cheapest supply method on paper can become the expensive option if the site is not ready, access is poor, labour is short or the mix is not suitable. A good concrete decision starts with measurement and ends with placement planning.

Choose Ready-Mix If…

  • Your measured volume is around 1m³ or more and you want the pour completed quickly.
  • The concrete needs a reliable grade such as C25, C30, PAV1, RC35 or a supplier-recommended mix.
  • You are pouring a slab, driveway, garage base, raft, strip foundation or reinforced element.
  • You need a delivery ticket, consistent batching and easier proof of what was supplied.
  • You have enough people or equipment ready to place, level, compact and finish the concrete immediately.

Choose Site-Mixed If…

  • The quantity is very small and a truck delivery would be uneconomic.
  • The work is non-structural, such as post holes, small repairs, haunching or bedding.
  • The site has no practical lorry access and pump hire would cost more than the project.
  • The job can be completed in small controlled batches without cold-joint or finish problems.
  • You already have the labour, mixer, clean water, storage space and material handling plan in place.

Best Professional Approach

For most UK domestic construction work, price both options honestly. Include labour, equipment, delivery, waste, VAT, access, pump hire and the cost of delay. The more important the concrete is to the building, the more weight you should give to consistency and specification rather than the cheapest headline price.

Pour-Day Planning, Finishing and Curing

The supply method only solves the first part of the job. Concrete also needs to be placed, compacted, levelled, finished and cured correctly. Ready-mix can arrive quickly, but that speed becomes a problem if the formwork is unfinished, reinforcement is not fixed, the sub-base is dry and dusty, or the team has not planned where the truck, pump and washout will go. Site-mixing gives more time between batches, but too much time can create poor bonding and uneven surface finish.

Before the concrete arrives or mixing starts, check formwork dimensions, levels, DPM, reinforcement cover, expansion joints, drainage falls and access route. Wet down dry sub-base lightly where appropriate, but do not leave standing water. Prepare rakes, shovels, tamping beam, float, edging resources, curing sheet, wheelbarrows, protective gloves and washout area before the first batch is discharged.

After placement, concrete should be protected from rapid drying, frost, heavy rain and early traffic. Curing is especially important in warm, windy or sunny weather because the surface can dry faster than the concrete gains strength. Poor curing can cause dusting, crazing and weak surface layers even when the concrete itself was supplied correctly.

Before Pour

Check dimensions, levels, reinforcement, DPM, sub-base compaction, access and resources. Do not order concrete until the site is fully ready.

During Pour

Place continuously, compact properly and avoid adding water on site unless the supplier confirms it is acceptable.

After Pour

Protect the slab from sun, wind, rain, frost and early loading. Follow supplier curing and traffic guidance.

2026 Data, Standards and Source Notes

This guide is written for practical UK homeowner and small-builder planning. It combines standard concrete volume working with 2026 UK cost context, material price movements, tax/levy changes and concrete specification references. It should not replace a structural engineer’s design, a Building Control requirement or a supplier’s project-specific mix recommendation.

ConcreteMath.co.uk Accuracy Policy

planning figures are planning estimates. Always check the final grade, delivery method, site access and specification with a qualified contractor, concrete supplier, structural engineer or Building Control officer where the work is structural or regulated.

Professional Advice for Structural Concrete

Use this page to compare cost and logistics, but do not substitute it for a structural specification. For foundations, retaining walls, reinforced slabs, suspended slabs or Building Control work, confirm the concrete grade and placement method before ordering.

Ready-Mix vs Site-Mixed Concrete — FAQs

Common UK questions about ready-mix concrete, site-mixed concrete, volumetric supply, concrete costs, ordering volume and 2026 building guidance.

Related ConcreteMath.co.uk Resources

Use these free UK guides to plan concrete volume, bags, ballast, sub-base, delivery loads and total project cost.

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