Concrete Pump Hire: How UK Homeowners Actually Book a Line or Boom Pump
Line pump vs boom pump for domestic foundations, how to book through your ready-mix supplier, pump-grade concrete premiums, priming, washout, and avoiding standby charges.
The mixer pulls up at the kerb with eight cubic metres on board. The driver looks at his chute, looks at your side passage, and says he can't reach the trench. Ninety minutes before the load goes off. No pump booked. You've just lost the cost of the foundation slab, because nobody told you a concrete pump was needed and how to book one.
This is the most expensive mistake on an extension foundation pour, and it happens because the ready-mix supplier (not the pump company) coordinates the booking.
What it is and when you actually need one
A concrete pump is a piece of plant that moves liquid concrete from a mixer-truck hopper through a steel pipeline or hose to the point of placement. Two formats matter for domestic extension work:
A line pump (also called a trailer-mounted or ground-line pump) sits on a small trailer, with a flexible 50–100m hose laid out across the ground. Concrete is fed in at one end, pumped along the hose, and discharged at the other. This is the format used for most domestic foundations. It needs only a 6 x 3m clear area to set up.
A boom pump is mounted on a truck. Instead of a ground hose, an articulated steel boom rises up and folds over obstacles, with a flexible placing hose at the tip. The pump itself stays at the truck. Domestic boom pumps come in 24m, 28m, and 36m reaches. The boom is what lets you deliver concrete to the back garden of a terraced or semi-detached house when there's no side access. It needs an 8 x 9m setup area on the road or driveway, plus a 100m operating radius clear of overhead cables.
You need a pump (either type) when the mixer-truck chute can't reach the trench. The chute on a standard 6m³ mixer extends about 2–3m from the rear of the truck. If the trench is more than 3m from where the mixer can park, you need a pump. The common scenarios on a UK extension are: rear-garden extensions where the only access is through a side passage too narrow for a mixer; rear-garden extensions on a terraced house with no side access at all; deep-fill foundations on a sloping site where the truck can't get close to the trench bottom; and any pour over 6m³ where wheelbarrowing isn't practical.
For an extension foundation under 4m³ with side access, a pump is overkill. Ready-mix down a chute or six wheelbarrows is faster and cheaper. For 6m³ or more, the calculation tips toward pumping even with side access.
Line pump or boom pump
Most UK domestic extensions use a line pump. The boom pump comes out only when ground access is genuinely impossible.
| Format | Best for | Reach | Setup space | Typical day rate |
|---|---|---|---|---|
| Line pump (trailer-mounted) | Side-passage access, foundations, ground-floor slabs, driveways | 50–100m horizontal hose, modest vertical lift | 6 x 3m for the trailer, plus a route for the hose | £275 – £450 |
| Boom pump 24m | Single-storey rear extensions reachable over a bungalow or single-storey wing | 24m vertical or out, then placing hose | 8 x 9m for the truck, plus 100m clear radius | £500 – £850 |
| Boom pump 28-36m | Two-storey houses where the boom must clear the main ridge | Up and over a two-storey roof, into a back garden | 8 x 9m + 100m radius, no overhead cables | £500 – £850 |
The boom pump premium is real but it's earned. Pulling 80m of line pump hose through a side passage, over a fence, around a pond and across a lawn is slow, awkward, and risks blockages where the hose bends sharply. Booming over the roof in twenty minutes is the alternative. If your only access is over the building, the boom pump isn't a luxury, it's the only viable option.
The CPCS scheme classifies pump operators in two categories that map to these formats: A06 for truck-mounted boom pumps, A44 for trailer-mounted line pumps. Reputable operators carry these cards. Hire only operators referenced through your ready-mix supplier or with verifiable CPCS credentials.
How you actually book a pump
The booking pattern most homeowners assume (call a pump company, agree a time, book the concrete separately) is the wrong pattern. The right pattern is to call the ready-mix supplier first and ask them to coordinate the pump.
Three reasons this works better:
The ready-mix supplier already has working relationships with local pump operators. They know whose timing is reliable and which pumps suit which jobs. The pump company gets pre-briefed on volume, mix design, access, and arrival window. When the mixer truck leaves the batching plant, the dispatcher tells the pump operator to start setting up, so the two arrive in the right order. Single-line accountability: if anything goes wrong on the day, you have one phone number to call rather than two companies blaming each other.
Camfaud, Premier Concrete Pumping, CPS, Brett Concrete Pumping, and Embassy Concrete Pumps are among the larger UK pump operators who work regularly with the major ready-mix suppliers. Heidelberg Materials, Tarmac, Hanson, CEMEX, Breedon, and the regional independents will all coordinate pump hire on request. Some smaller volumetric suppliers do not pump at all, which limits your supplier choice if pumping is needed.
When you call the ready-mix supplier, give them:
- The volume in cubic metres (always order at least 0.5m³ over your calculated need)
- The mix design (the engineer's spec, e.g. C25/30 GEN3)
- The pour date and ideal start time
- The site access description (side passage width, road parking, overhead cables, any tight turns for the mixer)
- Whether the pour is foundations, slab, or stepped foundations
The supplier comes back with a quote that bundles the concrete, the pump-grade premium, the pump hire, and any standby contingency. Compare that bundled price against booking pump and concrete separately. In most cases the bundled price is lower because the supplier earns margin on both lines and prices accordingly.
On BuildHub and other self-build forums, experienced operators consistently recommend ordering concrete as "X cubic metres PLUS" rather than an exact figure. The PLUS flag tells the batching plant you'd accept an emergency extra load on priority if your volume estimate turns out short. Without it, an extra half-cubic-metre during the pour may not be available for an hour or more, by which time the first load has set. The PLUS tag costs nothing if you don't use it.
Pump-grade concrete: what it is and what it costs
Standard footing concrete (C20 or C25 with 20mm aggregate and a moderate slump) doesn't pump well. The aggregate is too large for the typical 75mm or 100mm pump pipeline, and the mix segregates under pressure: the cement paste squeezes through, the stones lock up, and you get a blockage that takes thirty minutes to clear.
Pump-grade concrete addresses this in two ways. The aggregate is 10mm rather than 20mm (the Concrete Society fingertip rule is that pipeline diameter should be 3.5–4x the maximum aggregate size). The mix has more fines and a higher cement-paste fraction, giving it the cohesion to flow through the line without segregating. The strength grade is unchanged, so pump-grade C25 is still C25.
You pay a premium of £2 – £3 for the pump-grade specification. On a 10m³ pour at £90–130/m³, that's an extra twenty to thirty pounds on a four-figure pour. Trivial relative to the cost of the pump itself.
One thing to watch on pump-grade: it arrives stiffer-looking than the wet, sloppy mix homeowners often expect. That's deliberate. The cohesion that makes it pumpable also makes it look thicker. Do not let anyone add water to it on site. Adding water on site reduces the strength, can cause segregation in the pipeline, and is the single most common cause of pump blockages. Every operator guide and forum thread on the topic says the same thing: prepare to forbid it. If your mixer driver or builder asks for "a little splash to help it flow," refuse.
Priming the pump
Before any concrete goes through the line, the pump operator runs a mortar prime through it. Pumping a dry pipeline causes the first concrete to lose its paste to the pipe walls and seize the line. The prime coats the pipeline so the actual concrete flows.
You supply the cement for this. The figure varies a little by operator but the standard is one bag of 25kg cement per 20m of pipeline, mixed on site with water. For a typical 50m line pump run that's three bags. Some operators specify two bags per 20m, so confirm with the operator when booking and have an extra bag on standby. Cost: trivial; a 25kg bag is a few pounds from any builders' merchant.
The prime mortar is pumped first, then displaced by the concrete itself. The mortar is discarded (do not include it in your slab), so site a bucket or wheelbarrow at the discharge end to catch it.
You will also need to provide:
- A water supply (mains hose to the pump location)
- A washout box: a 2m x 2m area lined with polythene sheeting, away from any drains, watercourses, and protected trees
- Two or three 25kg bags of cement (priming + a contingency bag)
- Boards or sheeting to protect the pavement or driveway from concrete spills
- A clear unloading position for the mixer truck within the pump operator's specified distance
What pour day actually looks like
A typical domestic foundation pour using a line pump runs roughly like this.
The pump arrives 60–90 minutes before the first mixer is due. The operator surveys access, sets the trailer, runs out the hose to the pour location, and connects to the water supply. Setup takes around an hour. The operator then runs the prime mortar through the line. Only when the operator confirms the pump is primed and ready does the dispatcher release the first mixer.
The first mixer arrives. Its load discharges into the pump hopper, which feeds the line. Concrete emerges at the placing end and goes into the trench. A typical line pump moves around 1m³ per minute, so an 8m³ load discharges in about 8–10 minutes. The mixer leaves; the next one arrives. Eight cubic metres of foundation goes in across roughly 30–60 minutes including changeover time between mixers.
The pour ends. The operator pumps the residual concrete out (around 0.33m³ stays in the pump and hose, equivalent to about seven wheelbarrows). This goes into your washout box, not into the slab. The operator then flushes the line with water and a sponge ball, washing out into the same box. Cleanup takes another 45–60 minutes.
The whole pour spans a half-day. Most of that is setup and washout; the actual pumping is the shortest part of the day.
A boom pump is faster: setup 20–30 minutes, pour 10–15 minutes for the same volume, washout 20–30 minutes. On a tight residential street, the speed advantage matters; the truck blocks the road for half the time.
Standby charges: how the pump becomes a costly mistake
The pump and the mixers are billed on different clocks. The pump charges for the time on site. The mixers charge for the load and have a free unloading window of 20–30 minutes before discharge surcharges trigger. If they arrive out of order, you pay both ways.
If the pump finishes setup and the first mixer is delayed by traffic, the pump charges £60 – £90 for every hour beyond the included free window. If the mixer arrives before the pump is primed, the mixer charges discharge waiting time. Two hours of mismatched timing on a normal pour day adds well over a hundred pounds of avoidable cost.
Three rules to avoid this:
Book the pump and concrete through the same supplier. The dispatcher coordinates the timing; the pump and the first mixer arrive 20–30 minutes apart by design. This is the single biggest reason the integrated booking pattern works.
Confirm the timing the day before, not the day of. Pump operators and ready-mix dispatchers expect a confirmation call. Use it to flag any access changes (parked cars, road closures, neighbours' skips) that could delay arrival.
Designate one named site contact with a phone signal who is reachable for the entire pour window. Drivers ring the site contact when they're 20 minutes out. Two missed calls and you've got a mixer circling for an hour.
A 30-minute buffer between pump-ready and first-mixer-arrival costs nothing. A rejected load (concrete that has gone off because nobody could discharge it) costs roughly the price of the load itself plus the wasted pump time. On an 8m³ pour with C25, that's a four-figure write-off down the drain. Build in the buffer.
Insurance, regulations, and the operator's credentials
Concrete pump hire in the UK is governed by BS 8476:2007 (Code of Practice for the Safe Use of Concrete Pumps) and the CPA Good Practice Guide for the Safe Use of Concrete Pumps v3 (July 2025), published by the Construction Plant-hire Association in collaboration with HSE. Both documents address pump selection, operator competence, site planning, the pour itself, and washout. Reputable operators work to these standards as a matter of course.
Hire is almost always under the CPA Model Conditions for Plant Hiring, which place liability for the hire site on the hirer (you). For a domestic pour, this means your homeowner's policy and your builder's public liability cover need to extend to the pump operation while it's on your property. The pump operator's own employer's liability covers their staff. Confirm with your builder that their policy includes plant on-site; for a self-managed pour with no contractor, call your home insurer before the day.
The pump operator carries the relevant CPCS card (A06 for boom, A44 for line) and on truck-mounted booms, the appropriate Cat C driving licence. Do not hire from anyone who can't tell you which card their operator holds.
When pump hire isn't worth it
For a small foundation pour (under 3m³) with reasonable side access, pumping costs more than the concrete itself. A 2m³ pour at £90–130/m³ is a couple of hundred pounds of concrete; even a basic line pump adds the better part of three hundred pounds on top. At that scale, wheelbarrowing or taking the mix down a chute is cheaper.
For a pour over 4m³ where the mixer chute almost reaches but not quite, the calculation is closer. Time and labour matter: wheelbarrowing 6m³ across a back garden is two hours of strenuous work for two people, and any delay risks the concrete going off in the truck. Pumping the same volume takes 20 minutes. For most homeowners managing a build alongside other work, the pump hire is worth the time saved.
For pours over 6m³ with no chute access, pumping is simply the only practical option. Trying to wheelbarrow 8m³ of concrete across a typical back garden during the 90-minute working window before the mix sets is not realistic.
Common mistakes
The most frequently fatal errors on a pump-assisted pour, in roughly the order they cause problems:
Booking the pump too late. Pump operators are typically booked one to two weeks ahead in busy seasons (April–September). A Monday morning pump for a Wednesday pour is not always available. Confirm the pump booking the moment you have a foundation date.
Coordinating pump and ready-mix separately. Two phone numbers, two dispatchers, no single point of accountability. Use the integrated booking route through your ready-mix supplier.
Letting anyone add water to the mix on site. It compromises strength and causes blockages. Pump-grade concrete is stiff by design.
No washout area prepared. Some operators charge a three-figure surcharge if they have to deal with residual concrete themselves. A 2m x 2m polythene-lined box is ten minutes of preparation.
Trying to skip pump-grade specification. "I'll just order standard mix and pump it" is a recipe for a mid-pour blockage. Pay the modest pump-grade premium and pump clean.
Building control inspection not booked before the pour. The foundation trench inspection is a hold point. The pour cannot start until building control has signed off on the trench. Book this inspection well ahead of the pump arrival; if it slips, the pump goes home and you pay anyway.
Ignoring overhead cables for boom pump deployment. A boom pump rising into 11kV overhead cables is a fatal accident. The operator surveys for cables on arrival but you should have flagged them at booking. If your driveway is under cables, the boom pump may need to set up on the road instead, requiring a temporary traffic management arrangement that adds cost and lead time.
Where you'll need this
A concrete pump comes into play during the groundwork phase of any extension or renovation project where mixer access to the pour location is restricted:
- Foundations and footings - the primary use case; pump-assisted pour for any 6m³+ foundation where the mixer chute won't reach
- Drainage - rare but possible if a deep drainage trench needs concrete bedding and the mixer can't get close