Ready Mix Concrete vs Site Mixing: Which Option Fits Your Project?
Choosing how to get concrete for a building job often comes down to two methods: ordering ready mix concrete delivery or mixing it on site. Each approach has its own strengths and weaknesses, and the right choice depends on the size of the project, the site conditions, and the time available. This article compares the two options so you can decide which one suits your needs.
How each method works
Ready mix concrete is produced at a batching plant and delivered to the site in a truck mixer. The driver controls the mixing process during transit, and the concrete is discharged directly at the pouring area. This method gives a consistent, pre-engineered mix that meets a specific strength grade, such as C10, C30 or C40.
Site mixing, on the other hand, involves bringing cement, aggregates and water to the job site and combining them in a drum mixer or a pan. The crew measures the ingredients, often by shovel-load, and mixes them in batches as work progresses. This approach gives the team full control over the timing and volume of each batch.
Consistency and quality
One of the main advantages of ready mix concrete is its consistency. The material is batched under controlled conditions, with precise proportions of cement, sand, stone and water. This means the concrete you receive on site matches the specified strength and workability. For structural elements like foundations, floor slabs or retaining walls, this reliability is essential.
Site mixing can produce good concrete, but the quality varies more. The accuracy of the mix depends on the skill of the operator and the consistency of the materials. Variations in moisture content in the sand, the size of the aggregate, or the amount of water added can change the final strength. For a small garden path or a shed base this may not matter, but for load-bearing work it introduces risk.
Volume and scale
Ready mix concrete delivery is best suited to medium and large volumes. A standard truck mixer carries around 6 to 8 cubic metres, and orders below a certain volume may incur a minimum charge. For a driveway, a garage floor or a house extension, ordering ready mix is often the most practical route. The concrete arrives in one go, and the pour can be completed quickly.
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Site mixing works well for very small jobs. If you need less than about half a cubic metre, mixing by hand or with a small electric mixer can be more economical. There is no minimum order, and you can make exactly what you need. For a few fence posts, a small repair or a stepping-stone path, site mixing avoids the cost of ordering a full truck load.
Time and labour
Ready mix concrete delivery saves time on site. The concrete is ready to place as soon as it arrives, and a single truck can discharge a full load in a matter of minutes. This allows the crew to focus on placing, levelling and finishing the concrete without the interruption of mixing batches. For larger pours, multiple trucks can be scheduled to arrive in sequence so the work flows continuously.
Site mixing is more labour intensive. Someone must measure and load the mixer, add water, run the drum for the correct time, then discharge the batch and clean the equipment. This cycle repeats for every batch. For a one cubic metre pour, that could mean twenty or more separate batches. The work is slower and requires more hands, but it can be spread across a longer period if the team is small.
Site access and logistics
Ready mix concrete delivery requires good site access. The truck needs a clear route to the pouring area, with enough width, height and turning space. Overhead cables, narrow gates, soft ground or steep slopes can prevent the truck from getting close. The driver also needs a stable surface to park on while discharging. If the truck cannot reach the pour area, the concrete must be moved by wheelbarrow, which adds time and labour and may limit the usable life of the mix.
Site mixing is more flexible in tight spaces. A small mixer can be wheeled through a standard gate or positioned close to the work area. There is no need for a large vehicle to enter the site. This makes site mixing a good choice for back gardens, narrow alleyways or extensions where vehicle clearance is a problem. However, the materials themselves still need to be delivered and stored, so some access for a delivery vehicle is usually needed.
Weather and timing
Weather affects both methods but in different ways. Ready mix concrete is delivered at the right consistency for the conditions, and the supplier can adjust the mix design for temperature or humidity. Once the truck arrives, the concrete must be placed within a certain window, usually a few hours. Delays on site can mean the concrete starts to set before it is fully placed, which reduces the final strength.
Site mixing allows you to work at your own pace. If the weather turns, you can stop mixing and start again later. The cement and aggregates can be stored under cover, so you are not committed to a single pour window. This flexibility can be useful for small projects done in spare time, where the work proceeds in stages over several days or weekends.
Waste and environmental considerations
Ready mix concrete generates less waste because the mix is tailored to the order. The supplier calculates the exact volume needed, and the truck carries only that amount. Leftover concrete can sometimes be used for other small jobs on site, but any surplus that sets must be disposed of properly.
Site mixing can produce more waste if the mix design is not accurate. Over-ordering of materials is common, and bags of cement left open can spoil. On the other hand, small batches reduce the risk of having a large amount of concrete that cannot be placed in time. The choice depends on how carefully the materials are managed.
Cost considerations
Cost is often a deciding factor. Ready mix concrete includes the material, mixing and delivery in one price. For a medium-sized job, this can be very competitive because it saves labour time and reduces the risk of material waste. For very small volumes, the delivery charge makes it less attractive.
Site mixing has lower material costs per cubic metre in some areas, but the labour cost is higher. The time spent mixing, cleaning equipment and managing materials adds up. For a small job where labour is free or low cost, site mixing can be cheaper. For a larger job where time matters, ready mix often works out better overall.
Which one should you choose?
There is no single right answer. Ready mix concrete delivery is the better choice when you need a consistent, high-strength mix for a medium to large pour, when site access is good, and when you have a crew ready to place the concrete quickly. It is the professional choice for most structural work.
Site mixing is worth considering for very small volumes, for projects in confined spaces where vehicle access is impossible, and for work that proceeds in stages over a longer period. It gives you full control over the timing and avoids the pressure of a single large pour.
For many contractors and homeowners, the decision comes down to the specific conditions of the job. Checking the site access, the required volume, and the available labour will point to the right method. If you are unsure, talking to a local supplier can help. For example, Stacey Concrete Ltd, a Derbyshire-based supplier of ready-mix concrete grades C10, C30, C40 and more with delivery across the East Midlands, can advise on the volumes and access requirements for your project. Their team understands the practical constraints that affect concrete delivery and can help you plan the pour.
Stacey Concrete Ltd offers a range of standard and specialist mixes, and their delivery fleet covers a wide area. Whether you choose ready mix or site mixing, getting the concrete right is the foundation of a durable, long-lasting structure. Taking the time to match the method to the job saves money, time and frustration in the long run.
Stacey Concrete Ltd · Ryder Point Works, Wirksworth, Matlock DE4 4HE, UK · +44 1629 825188