Bulk earthworks in the UK: what drives the cost, the programme and the disposal bill

Bulk earthworks is the large-scale movement, treatment and placement of soil and rock to form the levels a scheme is built on. Cost is driven far less by excavation rates than by what happens to the material afterwards, because since 1 April 2026 the lower rate of landfill tax has stood at £8.85 per tonne, more than double the previous £4.05, with the standard rate at £130.75. On a scheme moving 100,000m³, that single change adds roughly £864,000 to a disposal-led strategy. The contractors who now deliver earthworks economically are the ones who keep material in the works rather than in lorries.

Key points

• Bulk earthworks means mass movement of material to form levels, distinct from groundworks, which is the substructure work that follows.
• Landfill tax from 1 April 2026 is £130.75 per tonne standard and £8.85 per tonne lower rate. Most excavated soil and stone goes at the lower rate, which more than doubled.
• Imported replacement fill carries the Aggregates Levy, set at £2.08 per tonne in April 2025, so material leaving and material returning are both taxed.
• On a 100,000m³ scheme, every 10 percentage points of material reused on site saves roughly £197,000 in tax and levy alone, before gate fees and haulage.
• The CL:AIRE Definition of Waste Code of Practice allows suitable excavated material to be reused as a product rather than a waste, provided a Materials Management Plan is in place before the material moves.
• Programme on most earthworks schemes is governed by weather windows, lorry movement limits and ground conditions, not by plant capacity.

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What bulk earthworks actually covers

The terms get used interchangeably on site and mean different things commercially.

Bulk earthworks is the mass movement of material: site strip, excavation of cut, hauling, treatment where required, placement and compaction of fill, and formation of the finished earthworks profile. It is measured in cubic metres, typically tens of thousands to millions, and it is the phase that determines whether a scheme balances.

Groundworks is what follows: foundations, substructures, drainage runs, service trenches, ducting and external works. It is measured in metres and items rather than bulk volumes.

Muck away is simply the removal of surplus material off site. It is a symptom of an earthworks design that does not balance, not a service in its own right.

The distinction matters when you are procuring. A groundworks contractor asked to price 400,000m³ of cut will price it as a haulage exercise, because that is the only tool available. An earthworks contractor with treatment and processing capability will price the same job as a materials balance, and the two numbers are rarely close.

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What drives the cost

Excavation itself is one of the smaller variables. These are the factors that actually move the number, broadly in order of influence.

1. Whether the scheme balances. A design where cut volume matches fill volume, with material suitable for its intended use, is the cheapest earthworks scheme there is. Every cubic metre of imbalance becomes either disposal or import, and usually both.

2. Material suitability. Material that meets the specification for engineering fill can be placed directly. Material that does not must be treated, replaced or removed. This single classification decision governs most of the budget, and it is settled by ground investigation, not by the earthworks contractor.

3. Contamination. The gap between lower rate and standard rate landfill tax is £121.90 per tonne. Material that fails classification and moves to the standard rate is the largest single cost risk on a remediation-led site.

4. Haul distance and haul route. On-site haul is cheap. Off-site haul is expensive, carbon-intensive, and usually constrained by a planning condition capping daily lorry movements.

5. Weather and material sensitivity. Cohesive soils are workable within a moisture band. Outside it, they cannot be placed and compacted to specification. This is why earthworks programmes are seasonal and why a scheme pushed into a winter working period costs materially more than the same scheme in summer.

6. Working space and phasing. Working within a live operational site, a running road, or a constrained urban plot restricts plant size, haul routes and the ability to stockpile. Stockpile space is often the hidden constraint that forces material off site unnecessarily.

7. Specification and verification. Compaction requirements, testing frequency and the earthworks specification in use all affect productivity. A well-written specification that recognises what site won material can achieve saves more than any rate negotiation.

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The 2026 disposal problem

The standard rate rise is routine. The lower rate rise is not. Government consulted on removing the lower rate or converging the two, and chose instead to keep the two-tier system while uprating the lower rate by the same cash amount as the standard rate each year. That makes the 2026 doubling the beginning of a trend rather than a correction, and it means the gap between disposing of material and reusing it widens every April.

What that looks like on a real scheme

Take a scheme with 100,000m³ of surplus excavation. Excavated soil is broadly 1.8 to 2.0 tonnes per cubic metre depending on material and moisture, so call it 180,000 tonnes.

The lower rate increase alone adds £864,000 to that scheme. Gate fees, haulage out and haulage back in sit on top. If the same 180,000 tonnes has to be replaced with imported primary fill, the Aggregates Levy adds a further £374,400 before the material itself is paid for.

Turned round the other way, which is the more useful framing at tender stage: on a 100,000m³ scheme, every 10 percentage points of material kept on site saves around £197,000 in landfill tax and Aggregates Levy alone. Gate fees, haulage in both directions and the reduced programme risk from fewer lorry movements are all additional.

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Keeping the material in the works

Most excavated material on most sites can be reused. The barrier is almost never engineering capability. It is classification, planning and timing.

The CL:AIRE Definition of Waste: Development Industry Code of Practice, usually called the DoWCoP, is the recognised route for treating excavated material as a product rather than a waste, so it can be reused without an environmental permit or exemption. It covers reuse on the site of production, movement between sites under a cluster arrangement, and processing at a fixed treatment facility with return to site.

The framework rests on four tests. The material must be:

• suitable for use, either as dug or after treatment covered by the plan;
• certain to be used, rather than stockpiled in hope;
• used in quantities no greater than necessary for the engineering purpose;
• used for a defined engineering purpose set out in the design.

Compliance is evidenced by a Materials Management Plan, prepared before material moves and declared by a Qualified Person. The plan records volumes, classifications, the sampling and testing regime, the destination and engineering purpose of each material stream, and the verification records that will prove what was done.

The practical point is timing. A Materials Management Plan is a design document. It depends on ground investigation data, a settled earthworks design and a defined use for each stream, so it has to exist before excavation. Written after the lorries start, it cannot recover material that has already gone.

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The five ways material stays on site

Reuse is not one technique. On a substantial scheme it is several running at once.

Designing the earthworks to balance. The largest saving is not a treatment at all. It is a cut and fill design developed early enough that levels, platform positions, embankment profiles and haul routes can still be influenced. By the time the design is frozen, most of the opportunity has been designed out.

Ground stabilisation. Wet or weak cohesive soils that would otherwise be classed as unsuitable can often be treated with lime or cement to meet fill specification. This converts a disposal cost into usable engineering fill and removes the matching import.

Crushing and screening site won stone. Excavated rock and hard arisings can be processed on site into graded aggregate for capping, piling mats, haul roads, drainage stone and pipe bedding. The material is already on site and already paid for, so the only real costs are processing and double handling.

Soil washing. Where contamination is what pushes material towards standard rate disposal, washing separates the contaminant into a much smaller fines fraction and recovers the coarse fraction as clean usable aggregate. Because the standard rate is £130.75 per tonne, reducing the tonnage that has to go there moves the budget quickly.

Treating tunnel and excavation arisings. Arisings conditioned during boring are often written off as disposal material. Treated properly, large volumes can be reclassified and reused. Duo has managed 1.6 million m³ of tunnel boring machine arisings on HS2 for SCS.

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What actually governs the programme

Earthworks programmes slip for a small number of predictable reasons, and plant capacity is rarely one of them.

Weather windows. Cohesive material can only be placed within a moisture range. A wet autumn does not slow earthworks down, it stops them. Programmes that assume continuous working through winter are optimistic rather than aggressive.

Lorry movement limits. Planning conditions frequently cap daily movements. Where a scheme depends on export and import, that cap, not the excavator fleet, sets the rate of progress. Reuse removes the constraint entirely.

Ground conditions differing from the investigation. They usually do. The question is whether the contractor has the treatment and processing capability to adapt on site, or has to stop and re-procure.

Consent and classification delays. Waiting on a Materials Management Plan, a permit or a classification result while plant stands idle is expensive and entirely avoidable with earlier planning.

Interfaces with other trades. Earthworks is rarely the only activity on site. Access, sequencing and handover of formation areas drive more delay than most programmes allow for.

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Bulk earthworks, groundworks and muck away compared

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How to choose an earthworks contractor

• Can they treat and process material, or only move it? This is the single question that separates an earthworks contractor from a haulage operation with excavators.
• Do they own the plant? Hired-in crushing and screening capacity is available when the hire market allows, which is not the same as when your programme needs it.
• Have they delivered comparable volumes? Ask for cubic metres on named schemes, not adjectives.
• Will they engage before the design is frozen? Early Contractor Involvement is where the materials balance is won or lost.
• Can they take responsibility for the Materials Management Plan and deliver it? A plan written by one party and executed by another is where reuse targets quietly disappear.
• What is their record on lorry movement reduction? It is increasingly a planning condition and a client sustainability requirement, not just a cost saving.
• Do they have machine control and survey capability to verify volumes and compaction against the design?

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Frequently asked questions

What is bulk earthworks?
The large-scale excavation, treatment, hauling, placement and compaction of soil and rock to form the levels and profiles a scheme is built on, measured in cubic metres and typically running from tens of thousands to millions.

What is the difference between earthworks and groundworks?
Earthworks is mass movement of material to form levels. Groundworks is the substructure work that follows, including foundations, drainage and services. Earthworks is priced by volume, groundworks by item and linear metre.

How much does bulk earthworks cost per cubic metre?
There is no single rate, because the cost is dominated by what happens to the material rather than by excavation. A scheme that balances on site and reuses its material costs a fraction of one that exports surplus and imports replacement fill, even with identical excavation volumes.

What is the landfill tax rate in 2026?
From 1 April 2026 the standard rate is £130.75 per tonne and the lower rate is £8.85 per tonne. The lower rate rose from £4.05, an increase of more than 113%.

Does landfill tax apply to excavated soil?
Yes. Naturally occurring soils and stone normally attract the lower rate. Contaminated material, or material failing the qualifying tests, attracts the standard rate, which is over fourteen times higher.

Can excavated soil be reused on site without a permit?
Yes, where the reuse complies with the CL:AIRE Definition of Waste Code of Practice and is covered by a valid Materials Management Plan declared by a Qualified Person. Without that, the material is likely to be waste and permitting will apply.

What is a Materials Management Plan?
A document prepared before material moves, setting out how excavated material will be reused for a defined engineering purpose, supported by testing and verification and signed off by a Qualified Person.

Can contaminated soil be reused?
Frequently yes, after treatment such as soil washing or stabilisation, or by placing it in a suitable engineering location under a Materials Management Plan. It depends on the contaminant, the concentration and the intended end use.

How many cubic metres are in a tonne of soil?
The reverse is the more useful figure. Excavated soil is broadly 1.8 to 2.0 tonnes per cubic metre, varying with material type and moisture content.

When should an earthworks contractor be appointed?
At design stage, before ground investigation is specified and before levels are frozen. Appointing after the design is complete removes most of the opportunity to balance the scheme.

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How Duo Construction delivers bulk earthworks

Duo Construction delivers bulk earthworks, ground improvement, remediation, drainage and utilities, reinforced concrete structures and materials processing for infrastructure and development projects across the UK, from Early Contractor Involvement through to commissioning. The construction team is led by Construction Director Liam Magee, whose 25 years in civil engineering span earthworks, remediation, reinforced concrete, drainage, utilities, pavement, processing, and mechanical and electrical works.

What distinguishes the approach is that Duo also builds and operates the processing plant. The wider group designs, manufactures and commissions crushing, screening, washing and stabilisation plant for the quarrying and recycling industries, with a manufacturing facility at Stoke, and can deploy that same capability onto a construction site. The materials strategy and the plant needed to execute it therefore sit inside one organisation, rather than being split between a consultant who writes the plan and a contractor who cannot deliver it.

Recent work includes HS2 Washwood Heath with BBV, covering 1.4 million m³ of excavation and remediation; management of 1.6 million m³ of TBM arisings for SCS on HS2; and 5.5 million m³ of earthworks on the M8, M73 and M74 Motorway Improvement Scheme. Duo has also delivered on the A14 Cambridge to Huntingdon scheme and the Aberdeen Western Peripheral Route.

To discuss the earthworks and materials strategy for a scheme in design or at tender, email info@duogroup.co.uk or call 0333 038 2483. Duo Operations, Siskin Drive, Coventry, CV3 4FJ.

 

Sources used for the figures: GOV.UK environmental taxes historical rates · letsrecycle, 2026 landfill tax rates · CL:AIRE Definition of Waste · Duo Construction