Data centres have quietly become one of the biggest construction stories in the UK. Data centre construction starts under £100 million are forecast to surge 13% in 2026, with 29 schemes in London alone holding planning permission and expected to break ground this year — alongside headline projects like the £8 billion AWS build, the £5 billion CWL41 site in Bridgend, and the £3.4 billion AI Pathfinder in the East Midlands. Analysis from Oxford Economics puts total announced UK data centre investment since 2023 at over $59 billion, with new capacity expected to more than double the country's IT power stock by 2030.
The driver is AI. Training and running large models needs enormous, continuous compute — and compute needs power, cooling, and a lot of ground infrastructure to support it. For civils and groundworks contractors, that's translating into a genuinely new category of site: not quite industrial shed, not quite utility infrastructure, but a hybrid of both, with civils requirements to match.
Why data centres are such a big civils job
A data centre isn't just a building with servers in it — it's a power, cooling and resilience facility built on top of a construction site. That means:
- Extreme floor loadings for server halls and plant decks, requiring heavy-duty groundworks and foundations
- Substations and standby generation on site, often at a scale closer to a small power station than a typical commercial development
- Large-scale earthworks, frequently on brownfield, former industrial, or greenfield sites brought into development at pace
- Significant water demand for cooling systems, alongside fire suppression water storage — enough that water availability is now a genuine constraint in some parts of the UK, with several water companies restricting new non-domestic connections in high-demand zones
- A construction compound and access infrastructure that has to support HGVs, cranes and specialist plant throughout a multi-year build
Because failures in an operational data centre have immediate commercial consequences for the clients relying on it, the quality bar on every part of the build — including the drainage — tends to be higher than standard commercial construction.
Where drainage and civils products fit in
Surface water and SuDS strategy — Data centre campuses cover huge areas of hardstanding: access roads, parking, plant compounds and substation yards. All of that needs a proper SuDS strategy under the same Schedule 3 rules now applying to any significant UK development. Soakaway crates for attenuation and infiltration, paired with vortex flow controls or orifice flow control chambers to manage discharge rate, are the standard building blocks.
Heavy-duty channel drainage — Compound roads and plant yards carrying HGVs, cranes and generator delivery vehicles during construction need drainage rated for serious loading, not just pedestrian-grade channel. Specifying to the correct load class from the outset avoids costly retrofits once the site is trafficked.
Silt and sediment control — With this much earthwork happening on-site, often over several years, sediment-laden runoff is a constant risk to watercourses and to the attenuation system itself. Silt filter chambers and catchpit chambers upstream of any soakaway or discharge point are essential, particularly during the extended construction phase.
Water supply and cooling infrastructure — MDPE water pipe is the standard for potable and process water mains feeding cooling plant and fire suppression systems, and blue water ducting protects these runs where they cross other services.
Power and fibre ducting — Given the scale of on-site substations, standby generation and the fibre connectivity a data centre depends on, cable ducting is one of the highest-volume product categories on any of these sites. Black electric ducting for power runs and colour-coded ducting for telecoms keep services identifiable and protected, with duct access chambers at joints and pull points.
Access and maintenance — Given the design life and operational criticality of these sites, inspection chambers and load-rated manhole covers throughout the drainage and ducting network need to be specified for decades of reliable access, not just to pass initial inspection.
The bottom line
The UK data centre pipeline isn't slowing down — with 50+ new facilities expected to come online in the next five years and IT power capacity set to more than double by 2030, this is one of the most active corners of UK construction right now. For civils suppliers, that means a growing volume of large, technically demanding sites that need SuDS-compliant drainage, heavy-duty hardstanding drainage, and extensive water and power ducting delivered to a higher reliability standard than typical commercial work.
If you're pricing or specifying for a data centre scheme, get in touch with our team for load-class guidance and a free drawing take-off.