Surging fuel theft: how to protect construction & CNI sites

Article

Fuel theft on UK construction and CNI sites is surging, driven by rising diesel prices and the shift to higher-value white diesel. Over half of firms are affected, with losses reaching £800 million annually. Our article explores how site managers can mitigate their risk to theft and how we can secure your site through a range of solutions tailored to you.

Fuel theft on UK construction and critical national infrastructure (CNI) sites has quietly become one of the most damaging and fastest-growing forms of site crime. Driven by volatile fuel prices, the removal of red diesel, and the growing volume of white diesel stored on site, both organised and opportunistic thieves are increasingly targeting fuel storage containers. Bowsers, static tanks, and portable units are often drained overnight or during periods of reduced activity.

The Chartered Institute of Building reports that 51% of construction companies have experienced fuel theft. The question is no longer whether your site is at risk. It’s whether you’re doing enough to protect it.

The scale of the problem

When the government removed the construction industry’s access to red diesel, sites were forced to switch to white diesel – a fuel usable in road vehicles and therefore far more valuable to thieves. Combined with today’s surging fuel prices, what was once a niche crime quickly became a mainstream one almost overnight.

The scale is significant. According to the Chartered Institute of Building, 51% of construction companies have experienced fuel theft. Beyond the direct cost of stolen diesel, the knock-on effects, project delays, equipment downtime, and insurance premium increases push the true cost to an estimated £800 million annually across the sector.

Construction sites aren’t the only ones exposed. CNI sites, energy, water, telecoms, and transport store significant fuel volumes on remote or unmanned locations to power generators and backup systems. They face the same vulnerabilities, compounded by distance from response teams and the critical nature of what they support.

Key statistics

51 %

of UK construction companies have experienced fuel theft (Chartered Institute of Building), and theft is now estimated to cost the sector £800 million annually, making it one of the most financially damaging forms of site crime.
35 %

increase in diesel cost during the first 3 months of 2026 due to global conflict, rising by an average of £1.41 per litre of diesel in January to £1.91 in April, further intensifying the risk of fuel theft.

Why are construction and CNI sites targeted?

Thieves are strategic. Construction and CNI sites present a near-perfect combination of opportunity and reward: high volumes of accessible fuel, predictable operational patterns, limited out-of-hours presence, and, in many cases, inadequate physical or electronic deterrents.

The most common vulnerabilities include:

Fuel bowsers and portable tanks are left unattended and unsecured outside of operational hours
Static above-ground tanks with no electronic monitoring or access control
Remote or unmanned sites with limited CCTV coverage and slow emergency response times
Poor perimeter security allows easy vehicular or pedestrian access to fuel storage areas
A lack of real-time monitoring, meaning theft can go undetected for hours or even days

Organised criminal gangs are known to use fuel tankers and purpose-built extraction equipment, draining hundreds or even thousands of litres in a single overnight visit. In many cases, sites only discover the loss when machinery fails to start the following morning. By then, the operational damage is already done.

What’s at stake

The immediate cost of stolen fuel is only part of the picture. For construction and CNI operators, the full financial and operational impact of a single incident can be significant:

Direct cost of stolen diesel at current white diesel prices
Plant and machinery downtime while tanks are refuelled or equipment is assessed for damage
Project delays with knock-on penalties or contractual implications
Insurance excesses, claims administration, and potential premium increases
Management time lost to incident reporting and investigation
Reputational risk with clients and supply chain partners

For CNI operators, the stakes are even higher. Fuel is often the backbone of backup power systems and critical operational continuity. A depleted or tampered fuel supply at an unmanned utility site, data centre, or communications hub could compromise essential services, with implications that extend well beyond a financial line in the budget.

It’s also worth noting the environmental and regulatory dimension. Fuel theft often involves tampering with tanks, which can cause spillages. Diesel spills on construction sites can trigger Environment Agency enforcement action, cleanup liability, and reputational damage that far outweigh the cost of the original theft.

How to protect your site

Effective fuel security does not require a single silver-bullet solution. The most resilient approach layers monitoring, physical deterrents, and access control to eliminate the easy opportunities thieves rely on. Here’s where to focus your efforts.

Monitoring and recording

Many fuel thefts succeed not because sites lack cameras, but because the footage is never reviewed in time to prevent or respond to an incident. A reactive approach simply isn’t good enough when thieves can drain a tank and disappear in under an hour.

Ensure 24/7 recording around the fuel storage area. Theft is not confined to the hours of darkness. Daytime opportunists are responsible for a significant proportion of fuel losses. Coverage should capture all activity within the immediate vicinity of the tank at all times.
Switch to alert-based monitoring outside operational hours. Recorded footage alone won’t stop a theft in progress. Ensuring your CCTV is actively monitored out of hours, with real-time alerts triggered by movement or access events, dramatically reduces the window in which thieves can operate undetected.
Consider door contacts on tank enclosures and access hatches. Where tank units have lockable doors or secure housings, door contact sensors provide an additional layer of detection, immediately flagging any unauthorised access attempt, day or night.

Securing portable and towable fuel units

Portable bowsers and towable fuel units pose a compounded risk; not only can the fuel be stolen, but the units themselves can be taken. This is an increasingly common tactic used by organised gangs targeting construction sites. If your site uses portable or towed fuel units, physical immobilisation is essential.

Use wheel clamps to prevent the unit from being towed or moved. This is one of the most cost-effective and visible deterrents available, and should be deployed as standard practice whenever a portable unit is left unattended.
Fit a tow hitch lock to prevent attachment to a third-party vehicle. High-quality hitch locks provide a robust mechanical deterrent that takes time and noise to defeat, both of which are effective theft countermeasures.
Temporarily remove the wheels where possible. Wheel removal makes relocation of the unit extremely difficult and time-consuming, significantly increasing the risk of detection for would-be thieves.

Physical access control

Technology is only effective when paired with physical deterrents that make access to fuel storage genuinely difficult. Even basic physical security measures can be enough to deter opportunistic thieves, and more sophisticated solutions provide robust protection against organised crime.
Secure and enclose the area around the fuel tank. A clearly defined, enclosed perimeter around fuel storage, with restricted access enforced by quality fencing, gates, and signage, creates a meaningful barrier. Solutions such as EnviroFence offer a robust, adaptable option suited to the dynamic layouts of construction and infrastructure sites.
Implement SMART access control to manage and audit entry. Traditional padlocks and keys are easy to defeat and provide no audit trail. SMART access solutions, such as the Loxal SMART lock, restrict access to authorised personnel only while creating a full digital record of every entry and exit, invaluable both as a deterrent and as evidence in the event of an incident.

Don’t let your fuel become someone else’s profit

Fuel theft is not an inevitability. Sites that take a layered, proactive approach, combining vigilant monitoring, physical immobilisation, and intelligent access control, become significantly harder targets. Given that the average construction site stands to lose tens of thousands of pounds annually to fuel crime, the business case for investing in the right protection is clear.

Orbis Protect works with construction and CNI operators across the UK to design and deploy integrated security solutions that safeguard fuel assets, reduce the risk of theft, and give site managers genuine peace of mind. Whether you’re managing a single portable bowser or a multi-site infrastructure programme, we’ll help you identify the gaps and close them, before the next incident.