UK digital infrastructure investment reaches £11.2bn in 2025

UK digital infrastructure investment surged to £11.2bn in 2025, a figure that dramatically reshapes the understanding of Britain’s technological capital formation. This new total is roughly three times higher than previous official estimates, which had reported only £3.6bn. The discrepancy does not stem from a sudden explosion of new spending but rather from a fundamental change in how the Office for National Statistics (ONS) categorizes economic activity. By expanding the definition of what constitutes infrastructure, the ONS has reclassified a significant portion of existing business expenditure into this new, broader category.

The shift in methodology adds several asset classes that were previously excluded or fragmented across different sectors. The updated measure now includes data centre buildings, network hardware, software, and radio spectrum permits. In contrast, the headline measure used prior to this change focused narrowly on telecommunications structures. The ONS has been transparent about this adjustment, noting that they are not discovering hidden investments outside of existing data. Instead, they are applying a wider lens to capture assets that support the modern digital economy, such as the physical shells of data centres and the software that runs them.

Despite the larger total, actual investment volume decreased slightly. Total spending fell by £0.5bn, or 4.0%, compared to 2024 levels. While this places the 2025 figure third in a historical series dating back to 1997, it represents a downward trend after years of growth. Tom Krazit noted this decline for The Stack, highlighting that while the longer-term trajectory remains positive,with investment climbing 51% above 2019 levels by 2023,the immediate past year saw a contraction.

The Composition of Modern Infrastructure Spending

The distribution of this £11.2bn investment reveals where businesses are prioritizing their capital. Two primary asset classes dominated the landscape in 2025, accounting for 84.0% of the total spend. The largest share went to other buildings and structures, totaling £5.6bn. This category captures the physical construction of data centres, fibre optic networks, and base stations. This sector has experienced explosive growth, rising 83.8% since the onset of the pandemic in 2020, reflecting the urgent need for physical hosting capacity.

Software and databases represented the second major pillar, with investment reaching £3.8bn. This segment now comprises one-third of the total digital infrastructure spend and has grown by nearly 95% since 2021. The resurgence of hardware investment also marked a notable shift. After years of long-term decline, hardware spending rose by 54.6% to reach £0.7bn. This marks the highest hardware investment level since 2006. The ONS attributes this reversal directly to the expansion of data centres required to support cloud computing and artificial intelligence workloads.

The previous measurement framework failed to capture these dynamics because it treated data centres as invisible. A single data centre involves multiple asset types: the building itself, the servers inside, and the software managing them. The old method looked strictly at telecoms industry structures and found little relevant data. The new approach extends beyond traditional telecommunications into data processing and hosting services, providing a more accurate picture of the digital backbone.

Drivers of Demand and Future Pipeline

The surge in investment is driven by rapid adoption of advanced technologies within the UK business sector. According to an ONS survey, the use of AI among UK businesses with ten or more employees jumped from approximately 12% in late 2023 to 35% this year. This adoption relies heavily on cloud infrastructure, with around 69% of firms already utilizing cloud systems in 2023. The physical manifestation of this demand is evident in the construction pipeline. Oxford Economics reported that the number of UK data centres increased by more than 400% between 2000 and 2024.

Looking ahead, the scale of development appears set to accelerate further. Barbour ABI identifies 171 data centre construction projects that have either commenced in the last year or are scheduled to start within the next five years. Industry analysts citing this data project that annual UK data centre investment could reach £10bn by 2029, up from the current annual total of £1.75bn. Hyperscale facilities, operated by global technology giants for their own internal use, accounted for approximately 63% of data centre development activity in 2025.

Government recognition of these assets has also intensified. In 2024, the state designated data centres as Critical National Infrastructure, placing them alongside essential utilities like energy and water supply. This classification underscores the strategic importance of these facilities to the national economy and security.

Funding Sources and Structural Constraints

While private capital drives the majority of this growth, public funding is playing an increasingly visible role. Government grants funded 5.7% of market sector digital infrastructure investment in 2024, amounting to £0.7bn. This is a sharp increase from £0.2bn in 2023 and represents the highest level in the recorded series. Over the entire period from 1995 to 2024, cumulative grants totaled £3.7bn, significantly outweighing the £0.5bn the government spent on communications assets it owned directly.

Private investment remains the dominant force. The market sector invested £11.6bn in 2024, self-funding £11.0bn of that amount. Telecoms operators constitute a substantial portion of this private spend. Ofcom reported that fixed-network spending by these operators reached £6.8bn in 2024, with 77% directed toward full fibre access networks.

However, progress faces significant headwinds, particularly regarding energy capacity. Bank of England governor Andrew Bailey has warned that AI deployment may need to be rationed due to power shortages. He stated that a lack of energy capacity will limit the widespread adoption of AI across all sectors. Evidence of this constraint is already visible; an Essex data centre faced delays waiting for grid connections, and the water industry has raised concerns about supply reliability. These bottlenecks are pushing some capital toward other regions, with Southeast Asia planning four times its current data centre capacity.

Methodological Caveats and Statistical Limits

The ONS has issued strong warnings regarding the interpretation of these new figures. The release explicitly states that these are not official statistics and advises against using them for policy formulation or decision-making. They are classified as official statistics in development, representing research into an alternative measurement method. The agency urges caution, emphasizing that the data should be viewed as exploratory rather than definitive.

Furthermore, the current measure has notable exclusions. It does not account for data itself, as no reliable UK estimates exist for this intangible asset, despite data being the primary output of data centres. The calculation also omits cooling systems, power distribution equipment, and server racks. The ONS indicates it may consider adding these components in future revisions.

A significant classification gap also exists. If a property company owns a data centre, its spending is filed under real estate rather than digital infrastructure. This means a portion of relevant investment never reaches these specific figures. Until the OECD reaches an international consensus on measuring these assets, the ONS plans to keep this expanded definition separate from its main infrastructure publication. Simultaneously, the agency is developing an AI account to track AI-related investment across the broader economy. Until definitions stabilize, the perceived size of the digital buildout will continue to depend entirely on which metric is cited.