Ark Data Centres (UK): Elstree Data Center 4

Elstree Data Centre 4 is part of the Ark Data Centres’ Elstree campus, located in the strategic London / Hertsmere region near the A41/M25 corridor.  As Ark plans to deliver 250 MVA across its Elstree campus beginning in 2028, this site (including building 4) is positioned as a critical node in the London metropolitan data infrastructure landscape. 

Because of its location close to key motorways and fiber backbone links, Elstree benefits from both excellent connectivity to London’s core and access to regional and national network routes. The modular, scalable design principles Ark uses allow this facility to support dense compute (e.g. AI, cloud) workloads with efficient cooling strategies and a lower carbon footprint. 

⚙️ Facility Highlights

• The Elstree campus is expected to deliver 250 MVA of power starting 2028 across multiple buildings (including Data Centre 4). 
• Ark uses modular construction, with recyclable steel architectures instead of solely concrete, reducing waste and improving agility. 
• Cooling systems: combined use of direct air cooling, indirect air cooling, and liquid cooling, optimized for high efficiency and low PUE. 
• Architected for precision air-optimiser control, enabling ambient-driven cooling wherever possible. 
• Designed for high density deployment, supporting emerging workload demands (AI, HPC) via flexible infrastructure.
• Sustainability emphasis: Ark’s data centers integrate energy efficient designs and low-impact building materials. 

🔐 Security & Compliance

• As with Ark’s broader portfolio, the site is operated under rigorous security standards (though building-specific certifications are not publicly listed). 
• Multi-layer physical security, likely including perimeter fencing, controlled access points, CCTV and monitored access zones (standard in Ark’s offering). 
• The Ark group maintains portfolio-level certifications including ISO 27001, ISO 22301, ISO 50001, ISO 14001, ISO 9001, ISO 45001 and compliance with Cyber Essentials Plus. 
• Onsite operations and facility staff ensure continuous monitoring, maintenance, and immediate response. 

🌐 Connectivity & Carrier Access

• The facility is carrier-neutral, enabling customers to choose from multiple network providers and interconnect partners. 
• It is part of Ark’s strategy to deliver hybrid colocation, allowing cross-connects, campus interconnection, and strong links to cloud service providers. 
• The Elstree campus sits in proximity to key fiber routes and national backbone infrastructure, providing low-latency pathways to London and beyond.
• Ark’s ethos includes integration with trusted fibre partners for resilient network access across campus and offsite links. 

💼 Who It Serves

• Hyperscale and cloud service providers requiring scalable infrastructure in the London region
• AI, machine learning, and high-performance computing environments needing dense, efficient infrastructure
• Enterprises and financial services firms seeking secure, scalable colocation near London’s core
• Content delivery networks, media, and telecommunications operators needing robust interconnectivity
• Organizations prioritizing sustainability, modular growth, and energy-efficient operations