Reviewed, sourced guidance

Ready-mix concrete or mixing on site?

Published 23 Sept 2026Reviewed 24 Sept 20262 min read

Direct answer

There is no universal volume at which ready-mix becomes cheaper than site mixing. Compare the supplier quote and minimum-load terms with the product yield, bag cost, mixing time, delivery access and placing plan for your job.

Both routes produce concrete. The decision comes down to how much you need, how fast you can place it, and whether a lorry can reach the pour.

Key takeaways

A supplier minimum load or part-load charge can change the comparison.
The amount you can mix and place in time depends on the crew, equipment and job.
Long delays can make concrete harder to place and compact; agree the placement sequence before delivery.
Confirm vehicle access and discharge method before comparing quotations.

Evidence note

Source-led homeowner information with its scope, limits and commercial status recorded.

View the full evidence note

Produced by: My Concrete Calculator
Jurisdiction: Applies to work in the United Kingdom; specification requirements vary across England, Wales, Scotland and Northern Ireland
Page scope: Choosing between a delivered load and site mixing for a straightforward pour.
Default subject: Concrete quantity estimation for slabs, footings and similar straightforward pours, including waste allowances and optional product-specific bag estimates.
Excludes: Structural, engineering or specification advice; Mix design or strength class selection for any specific job; Prices, quotations or supplier comparisons; Supplier recommendation, ranking or referral; Concrete supply, delivery, placing or finishing
Published: 2026-09-23
Reviewed: 2026-09-24
Commercial status: Information publisher only. No supplier is active, no lead capture runs, no enquiries are collected and no affiliate links are present.

Suppliers apply different minimum loads and charges. Confirm the minimum, the delivery charge and any part-load fee with the supplier before deciding.

How this guidance is produced · Correction submission status

Compare the real constraints

There is no single break-even volume that applies to every product, supplier or site. A delivered load may have a minimum or part-load charge, while bagged mix has a product-specific yield and takes time to batch consistently.

Compare like with like: the supplier quote and its terms, the selected bag yield, labour and equipment, delivery access, and the time available to place the concrete.

Ask the supplier for the minimum order, part-load charge and delivery terms.
Use the product packaging to calculate bag quantities and compare the total cost.
Confirm that the crew and equipment can mix and place the planned quantity in time.

Sources for this section: BRMCA, Ready-Mixed Concrete practical guide for site personnel (July 2020; observed 2026-09-25)Tarmac, Blue Circle Multi-Purpose Concrete product data sheet (December 2023; observed 2026-09-25)Heidelberg Materials, 40N Concrete technical data sheet (July 2025; observed 2026-09-25)Heidelberg Materials, Merchant concrete guide (December 2025; observed 2026-09-25)

Time is the real constraint

BRMCA recommends placing concrete in its final position as soon as practicable. Extended delays can reduce consistence and make placing or compaction more difficult.

If concrete is placed in successive layers, a cold joint is possible when the earlier layer has started to set before the next is placed. The relevant time depends on the mix and conditions.