The UK government has earmarked an additional £174m for the Lower Thames Crossing project to fund public works on both sides of the proposed road tunnel. This funding boost aims to help unlock a projected £7.5bn in private sector investment for the £11bn infrastructure scheme, which is currently scheduled for completion in 2034.
Why is the Lower Thames Crossing receiving extra funding?
The Department for Transport (DfT) confirmed that the extra £174m will be drawn from existing budgets to support the construction of the road tunnel. This decision follows a road investment strategy document published in March, which brought the total current government allocation to £1.66bn.
To understand how this figure was reached, it helps to look at the recent breakdown of public spending on the project:
- £590m: Allocated during the 2025 spending review.
- £891m: Awarded in the last autumn budget.
- £174m: The most recent boost from the March road investment strategy.
According to the DfT, the total amount of public money committed to the project so far is £3.1bn. The ultimate goal of this public expenditure is to “unlock” a much larger £7.5bn injection from the private sector, which the Chancellor, Rachel Reeves, described as essential for the long-term operation of the route.
How do these costs compare to the HS2 project?
The “spiralling” cost of the Lower Thames Crossing has become a central point of contention for critics. The project, which aims to create a new route under the Thames between Kent and Essex, is already being compared to the high-speed rail link (HS2) due to its high price tag.
Rebecca Lush, a roads campaigner at the Transport Action Network, has been vocal about these rising expenses. She suggested that the project’s current trajectory shows “all the hallmarks of HS2,” specifically citing the fact that the tunnel is already costing more per mile than the rail project. Lush further criticized the DfT for “bunging” more money toward the project while refusing to publish an outline business case.
This lack of a formal review document has raised questions about transparency. While the DfT maintains the project is “vital” to easing congestion on the M25, campaigners argue that the secrecy surrounding the budget is concerning.
What is the plan for private sector control?
One of the most significant shifts in the project’s management is the move toward privatization. Last year, The Guardian reported that the DfT had taken direct control of the project, a move that forced National Highways to step down as the primary agency for planning and oversight.
The long-term vision involves handing over the operation of the new tunnel—along with the existing Dartford tunnel located seven miles to the west—to a private consortium. This handover is expected to take place in 2029. Once the license is granted, the consortium will hold it in perpetuity, overseen by an independent regulator.
This transition has sparked a debate over national transport policy. While the government is currently nationalizing railways, critics like Lush argue that the administration is simultaneously privatizing the nation’s roads, creating what she describes as an “utter incoherence” in policy.
What happens next for the project?
Despite the budgetary concerns, the government remains committed to the 2034 completion date. Transport Secretary Heidi Alexander has reinforced the project’s necessity for the UK’s transport network.
The next major hurdles will involve:
- Securing the full £7.5bn in private sector investment.
- Managing the transition of oversight from the DfT to a private consortium by 2029.
- Determining how users will be charged, though the DfT has stated that any tolls will be regulated to ensure fairness.
As the project moves forward, the tension between the need for improved infrastructure and the management of public funds will likely remain a headline issue for UK transport policy.
Frequently Asked Questions
The current scheduled completion date for the works is 2034.
A private consortium is expected to take over the license to run the tunnel in 2029.
While no specific decisions have been made, the DfT has stated that any tolls will be overseen by an independent regulator to keep prices fair.
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