Parallel permitting reforms in the United States and the United Kingdom are delivering measurable efficiency gains for modular data center projects, but diverging codes, inspection cadences, and vendor qualification frameworks continue to create friction for developers operating across both jurisdictions.
Background
The two countries have pursued permitting acceleration along separate but broadly aligned tracks. In the US, a July 2025 executive order directed the Federal Permitting Improvement Steering Council (FPISC) to identify "Qualifying Projects"-including data center developments exceeding $500 million or designated as critical infrastructure-and fast-track them under the FAST-41 process. The order also instructed the Environmental Protection Agency to establish categorical exclusions under the National Environmental Policy Act, reducing review timelines for large-scale builds.
In the UK, December 2024 reforms to the National Planning Policy Framework (NPPF) now require local authorities in England to actively consider data center demand when setting planning policies and deciding applications-a significant shift from a system where, according to legal analysis by Womble Bond Dickinson, data centers were "largely absent from national planning frameworks" until late 2024. The UK government has also designated two AI Growth Zones-in Oxford and the North East-intended to fast-track planning and grid access for AI-related data center infrastructure.
Modular data center builds-factory-assembled units integrating power, cooling, and monitoring systems-can reduce delivery timelines from 18-36 months for traditional builds to as little as 6-8 months, making them a primary tool for developers seeking to exploit new permitting windows on both sides of the Atlantic.
Details
Despite parallel reform momentum, alignment gaps remain material. The two countries operate under distinct technical standards: US modular builds are governed by UL 2755, while UK and European deployments must conform to the EN 50600 series, covering structural design, power distribution, and environmental control. Developers deploying standardized modular components across both markets must demonstrate dual compliance, adding cost and procurement lead time.
On grid access, the UK's Ofgem in April 2025 finalized its TM04+ "First Ready, First Connected" reform, replacing the previous "first come, first served" model to prioritize projects that are technically and commercially ready. In the US, the Federal Energy Regulatory Commission issued an advance notice of proposed rulemaking in October 2025 on large-load interconnection-a structurally different mechanism still in early-stage development.
Vendor qualification presents a further gap. In the US, projects qualifying under the executive order framework must comply with security standards including FedRAMP High Impact, CMMC Level 3, and NIST SP 800-171 for high-risk, AI-capable infrastructure. The UK currently lacks an equivalent unified vendor qualification framework for modular data center components, though industry bodies are understood to be developing guidance.
Local-level fragmentation also tempers national reform progress. According to MultiState, state-level moratorium bills have been introduced in 11 US states in 2026, while dozens of municipalities have implemented local construction pauses. In the UK, electricity consumption at UK data centers is expected to quadruple by 2030, according to a House of Commons research briefing, yet planning policy in Wales and Northern Ireland contains no specific reference to data centers.
The cost environment adds further complexity. The Social Market Foundation has found that powering a data center in the UK is more expensive than in other European markets, and four times more expensive than in the United States-a disparity that affects the economics of deploying identical modular configurations in each jurisdiction.
Outlook
The UK's Planning and Infrastructure Bill, which proposes replacing the "first come, first served" grid connection model, is expected to reduce grid connection delays by several years, a critical improvement for data center developers facing long lead times, according to legal analysis by Womble Bond Dickinson. In the US, the FAST-41 dashboard process requires Qualifying Projects to be tracked within 30 days of identification, offering developers greater timeline visibility. Harmonizing inspection cadences and technical standards between the two countries, however, will require deliberate coordination between regulatory bodies-a step neither government has formally committed to as of April 2026.
Related coverage: US and EU Push for Unified Modular Data Center Permitting · Permitting Tightens in Key Markets, Driving Modular Data Center Demand · US Federal Agencies Propose Streamlined Permitting for Modular Data Centers
