The UK data centre boom is no longer a future possibility. It is already creating major opportunities for contractors, sub-contractors and specialist trades across Essex, Kent, London and the wider South East.
Some commentators have described the expansion as the biggest UK construction boom since the post-war rebuild. That may sound dramatic, but the numbers explain the excitement. Global spending on data centre infrastructure is expected to exceed $1 trillion by 2030, while London remains one of Europe’s five major data centre hubs alongside Amsterdam, Dublin, Frankfurt and Paris.
During 2025, more than 60 separate planning applications were made for new data centres in England and Wales alone, and the pace is increasing. Government-backed AI Growth Zones are also supporting new development, with qualifying sites expected to provide at least 100 acres of developable land, together with a credible remediation plan where land needs enabling works.
For contractors, this is an important commercial opportunity. It is also a warning. A data centre package should not automatically be treated like a conventional warehouse, office or industrial unit. The construction risks are different, the interfaces are more complicated and the financial consequences of delay can be much greater.
Why data centres are different
The UK is land-scarce compared with the United States. Instead of building only large, single-storey campuses, developers are increasingly looking upwards, creating multi-storey facilities with dense electrical, cooling and mechanical systems.
There is also greater use of modular and prefabricated units. Power rooms, cooling systems and data hall components may be manufactured away from the main site, transported across the country and installed in carefully sequenced phases.
That approach can improve consistency and speed, but it creates more points at which something can go wrong:
- Components can be damaged during manufacture, storage or transport.
- A defect in one repeated module may affect many parts of the project.
- Responsibility can become unclear between the designer, manufacturer, installer and main contractor.
- A late discovery may require extensive strip-out and replacement work.
- A specialist supplier becoming insolvent can be difficult to replace.
This is one reason why AXA XL’s analysis of the UK data centre boom describes data centres as a growing specialist construction class rather than simply another form of commercial building.
Power, cooling and construction-phase risks
Power is central to every data centre project. Large developments need enormous capacity, but grid connections can be delayed or constrained. Some schemes will also use on-site generation, such as combustion turbines, fuel cells and diesel generators, while more experimental projects may be linked to nuclear generation or other first-of-kind power systems.
New technology can solve one problem while creating another. Unfamiliar equipment and complex integration increase the likelihood of installation faults, commissioning problems and delays. Those risks become more serious where parts of the site are energised while other areas are still under construction.
Cooling is another major exposure. Rising server density, particularly from artificial intelligence workloads, is driving increased use of liquid cooling. This introduces risks involving corrosion, material incompatibility, condensation and installation defects.
Open-loop cooling systems may require very large volumes of water. Thames Water has estimated that one data centre could require up to 19 million litres a day. Closed-loop systems reduce some of that demand but can be highly bespoke, which means the quality of design, installation and testing becomes especially important.
The construction environment itself also needs careful control. Dust, water ingress and airborne contamination can damage highly sensitive GPU and server equipment. Hot works, fire suppression, temporary power, housekeeping and access routes all need to be planned around the equipment being installed.
A small event can create a large claim. A water leak in an ordinary commercial building may damage finishes and stock. In a data centre, it could contaminate critical equipment, interrupt testing and delay the opening of an entire facility.
Zurich has made the sensible point that limited historical losses should not be mistaken for low risk. The sector is changing faster than the claims data. Insurers therefore need to assess how the project is designed and managed, rather than relying only on what happened in older buildings.
Delay may matter more than physical damage
The scale of these developments is increasing quickly. Individual designs may range from around $1 billion to $20 billion, while hyperscale campuses globally are now routinely valued at $30 billion to $40 billion.
At that scale, the largest financial loss may not be the cost of repairing physical damage. It may be the delay that follows.
Data centres have strict operational commitments, long commissioning programmes and substantial contractual dependencies. A damaged transformer, cooling unit, switchgear component or prefabricated module may not be available immediately. Expediting a replacement can be extremely expensive, particularly where semiconductors, specialist materials and imported equipment are involved.
This creates significant exposure under Business Interruption and Delay in Start-Up arrangements. It also explains why the Aon 2026 Global Construction Insurance and Surety Market Report identifies digital infrastructure as one of the defining drivers of construction insurance.
For contractors, delay and disruption clauses need to be understood before a price is submitted. Liquidated damages, milestone obligations and responsibility for late handovers can materially change the profitability of a package.
What this means for contractors in the South East
This opportunity is not limited to Tier 1 contractors. Data centre projects need a broad range of businesses, including:
- Groundworks and civil engineering contractors
- Concrete frame and structural steel specialists
- Cladding and building envelope contractors
- Mechanical, electrical and HVAC contractors
- Fire suppression and detection specialists
- Security, access control and communications installers
- Fit-out, logistics and specialist handling contractors
Many of these businesses are based in Essex, Kent and London, particularly around the M25 corridor and established industrial areas. New AI Growth Zone sites may also create opportunities outside the traditional London cluster.
However, contractors need to review their insurance before accepting this type of work.
Construction Contractor Insurance
Contract works or Contractors All Risks cover must reflect the actual project scope. This is particularly important where equipment is stored on site, where works are phased, or where modules are manufactured elsewhere and later delivered for installation.
Questions to consider include:
- When does cover attach to equipment stored away from the main site?
- Who is responsible for damage during transport and unloading?
- Are testing and commissioning phases included?
- Are temporary works, temporary power and specialist plant adequately insured?
- Would the policy respond to the cost of accessing, stripping out or reinstating defective work?
A standard wording may not deal properly with the full construction and installation process.
General Contractor Liability Insurance
The number of contractors operating on one site creates substantial interface risk. A mistake by one specialist may damage another contractor’s work, injure someone else’s employee or affect high-value equipment belonging to the developer.
Main contractors and developers may also require higher limits, strict contractual indemnities and additional insured arrangements. These requirements should be checked against the policy rather than accepted without discussion.
Our general contractor insurance service is designed around the fact that contractors often need several covers working together, including employers’ liability, public liability, products liability, contract works, hired-in plant and goods in transit.
Professional indemnity
Professional indemnity becomes relevant when a contractor takes on design, coordination, specification, commissioning advice or certification. This is common in mechanical and electrical packages, modular installation and specialist systems integration.
The distinction between “design” and “installation” is not always clear in a data centre contract. Before signing, contractors should check whether they are warranting performance, approving someone else’s design or accepting responsibility for the final system.
Our earlier guidance on building safety, contractor liability and the changing boundary between liability and PI is also relevant here.
Practical steps before tendering
Before pricing a data centre package, I recommend that contractors:
- Read the exact scope and insurance conditions. Do not rely on a generic trade description.
- Identify where responsibility changes hands. This includes manufacture, storage, transit, installation, testing and handover.
- Check the treatment of sensitive equipment. Confirm who is responsible for protection, security and environmental conditions.
- Review hot-works and fire-control arrangements. These should be practical for the actual construction sequence.
- Agree handover and interface protocols. Written records can be crucial when several contractors work in confined areas.
- Understand delay and liquidated damages provisions. A profitable package can become loss-making if delay responsibility is open-ended.
- Disclose the work accurately at renewal. Describe the project, your scope and any design responsibility clearly.
- Use an advice-led broker review. Generic online cover may not respond to a specialist data centre package.
A growing market with changing insurance capacity
Insurers are treating data centres as an attractive but fast-evolving class. AXA XL has established a Special Interest Group focused on data centres, while Aon has supported Factory Mutual in sourcing an additional US$5 billion of cover for data centre risks.
That does not mean capacity will always be simple to obtain. The concentration of values is a concern because data centres tend to cluster where power, land and incentives exist. Aon has warned that several physically separated and individually fire-protected sites may be preferable to one enormous campus.
Public resistance is another issue. Planning refusals, judicial reviews and moratoria can create delay or abandonment exposure before construction is complete. The proposed hyperscale development at Iver in Buckinghamshire is a useful reminder: the government accepted a “serious logical error” in the approval process after environmental concerns involving power, water and sustainability.
Proposed changes to the National Planning Policy Framework, following a consultation that closed on 10 March 2026, aim to streamline consent for data centres and their power generation. That may support development, but it will not remove local planning, environmental or supply-chain risks.
The opportunity is real, but preparation matters
The data centre boom is likely to remain a major source of construction work for the next five to ten years. Contractors in Essex, Kent, London and the wider South East are well placed to benefit, but the successful businesses will be those that understand the risk before accepting the work.
A data centre package may involve unusual storage arrangements, demanding handovers, modular components, specialist design duties and severe delay consequences. Your Construction Contractor Insurance and General Contractor Liability Insurance should be built around those facts.
If you are considering a data centre tender, speak to Moyak before signing the contract or confirming your price. We can review the scope and help you arrange suitable Business Insurance Essex or Business Insurance London based on your actual work, turnover and responsibilities.
General information disclaimer: This article provides general information only and does not constitute insurance, legal, planning or engineering advice. Policy cover, exclusions, conditions and limits vary between insurers. Contractors should obtain advice on their specific contract and insurance programme before starting work.
Frequently asked questions
Is data centre work covered by standard construction insurance?
Not necessarily. Standard construction policies may not fully address off-site manufacturing, modular components, sensitive equipment, phased commissioning, testing or extended delay exposure. The policy should be reviewed against the actual package and contract.
Do specialist trades need General Contractor Liability Insurance for data centre work?
They may need public liability, employers’ liability, products liability and, depending on their responsibilities, professional indemnity. Main contractors and developers may also impose specific limits and contractual requirements.
Why is cooling such a significant data centre insurance risk?
Modern data centres generate substantial heat, particularly where high-density AI servers are installed. Liquid cooling systems can introduce risks including leaks, condensation, corrosion, material incompatibility and installation defects, all of which may damage equipment or delay completion.
Does a data centre contractor need professional indemnity insurance?
Professional indemnity may be appropriate where the contractor provides design, design coordination, system specification, certification, commissioning advice or performance warranties. The contract and the policy wording should be checked together.
When should a contractor review insurance for a data centre package?
Ideally before tendering. Reviewing the insurance after the contract is signed may leave little room to negotiate unsuitable conditions, limits or exclusions.
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Suggested publication: Thursday, 3 September 2026 at 6:00 PM Europe/London