Concrete is bought differently from most construction materials. There is no catalogue price that means much, the unit rate is only part of the cost, and several of the charges that appear on an invoice are consequences of how the job ran rather than of what was ordered. This page explains the commercial structure so that an estimate can be built on it honestly.
How concrete is priced
The headline is a unit price per cubic yard for a specified mix, and it is composed of four things that move for different reasons: cementitious materials, aggregates, admixtures, and delivery. Cementitious cost tracks the specified strength and the exposure requirements, because both drive the binder content. Aggregate cost tracks haul distance from the pit. Admixture cost tracks the performance requirements. Delivery cost tracks cycle time — and therefore tracks the site's own efficiency more than anything the producer controls.
Because delivery is a real and substantial share, the same mix is genuinely not the same price to a site fifteen minutes from the plant and one an hour away, or to a crew placing eighty yards an hour and one placing twenty. Quotations are therefore job-specific and time-limited rather than list-priced.
The charges that surprise people
Short-load charges. A truck carrying two yards costs almost the same to load, drive and wash out as one carrying ten. Loads below a minimum quantity therefore carry a surcharge, usually stepped by yardage. This is arithmetic, not opportunism, and it is why combining small pours is worth real money.
Standby or demurrage time. Each load includes an allowance of unloading time, commonly in the region of five to seven minutes per cubic yard, and time beyond that is chargeable by the minute. A site that keeps trucks waiting is consuming fleet capacity that cannot be sold to anyone else — and is also ageing its own concrete against the discharge window described under delivery geography.
After-hours, weekend and holiday delivery. Reflects driver and plant staffing premiums. In hot climates, night placement is often technically preferable, so this cost is frequently worth paying rather than avoiding.
Cancellation and returned concrete. Once batched, concrete cannot be put back. Late cancellation of a scheduled load, or the return of unused concrete, is chargeable, and disposal of returned material is a real cost to the producer.
Environmental, fuel and energy surcharges. Common, variable, and generally indexed to something published rather than set at will.
Winter heating and summer cooling. Heated water in cold weather, ice or liquid nitrogen in hot weather, and cold-weather protection materials all carry cost, and they are seasonal rather than constant.
Admixture and mix premiums. Accelerators, retarders, high-range water reducers, fibres, colour and shrinkage-reducing admixtures are priced per dose and can add materially to a unit rate.
Escalation
Cement, aggregate, fuel and admixture prices move, and concrete quotations for long-duration projects normally carry an escalation mechanism or a validity period. Fixing a price for the whole of a multi-year project requires either a genuine hedge or a risk premium; there is no third option, and a supplier who agrees to a long fixed price without either has simply mispriced the risk.
Accounts and credit
Concrete is sold on trade credit, so a new customer will normally go through a credit assessment before an account is opened: trade references, bank reference, an assessment of financial standing, and personal guarantees where the trading history is short. Cash-on-delivery terms are the usual alternative for occasional or small buyers.
The producer's exposure is real and structural. Materials are delivered and consumed immediately, payment follows the construction payment chain, and that chain is long. This is why construction lien statutes exist and why material suppliers are usually entitled to file against the improved property. Requirements, deadlines and notice obligations are jurisdiction-specific and unforgiving of missed dates, so the mechanics belong with a qualified adviser in the relevant state rather than in a general reference.
Sales and use tax treatment is likewise jurisdictional, and varies with whether the concrete is sold as a material or as part of an improvement to real property, and with the tax status of the purchaser. Exemption certificates are commonly involved. Again, a general reference can flag the issue but cannot resolve it: get local advice.
What a purchaser can do to lower the real cost
The largest savings in concrete procurement are usually operational rather than negotiated.
- Place at a steady, realistic rate. Waiting time and short loads are the two most avoidable charges on a typical invoice.
- Prepare the site before the first truck. Forms complete, reinforcement inspected, pump primed, crew present, access firm and drained.
- Combine small pours. Several two-yard loads on separate days cost far more than one combined placement.
- Specify honestly. Strength specified higher than the design requires, or an unnecessarily small aggregate size, adds cementitious cost to every yard for no benefit.
- Bring special requirements forward. A mix that needs trial batching costs nothing extra if it is submitted in time and a great deal if it is discovered at the chute.
- Schedule outside peak traffic. Shorter cycle times reduce delivery cost and improve the concrete at the same time.
Documentation to keep
Delivery tickets are the primary record and should be retained with the test reports: they carry batch time, mix identification, quantity, water withheld and water added, and they are the evidence in any later dispute. Mix submittals, materials certificates, calibration records and testing reports complete the file. The investigative sequence when results are questioned is set out under testing, and the standard purchase specification that governs the relationship is published by ASTM International, with industry guidance from the National Ready Mixed Concrete Association.
About this page
This is an independent reference and is not legal, tax or financial advice. It sells nothing, opens no accounts and represents no supplier.