Ark Data Centres – Union Park DC3
N Hyde Gardens, Hayes, UB3 4QR, GB
Union Park occupies the Bulls Bridge Industrial Estate at North Hyde Gardens in Hayes, UB3 4DG, a site the London Plan 2021 designates a Strategic Industrial Location. Ark is building it out as four blocks. UP1 is occupied and running; UP2 and UP3 are under construction; UP4 won approval from the London Borough of Hillingdon in September 2025, filed by Ark UP4 Ltd and described as over GBP 1 billion of private investment supporting more than 350 jobs. Neither a network nor an exchange is registered against the campus today. Ark's Uptime Institute record covers Cody Park and Spring Park only. Across the group Ark counts eight data centres over nine locations.
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Frequently asked questions
What stage is UP3 at Union Park?
Under construction, alongside UP2. UP1 is the only block occupied and operating, and UP4 is approved but not started.
Which authority approved the fourth Union Park block?
The London Borough of Hillingdon, in September 2025, on an application by Ark UP4 Ltd carrying more than GBP 1 billion of private investment and 350-plus jobs.
Which certifications cover Union Park?
The Uptime Institute's Ark record lists Cody Park and Spring Park; Union Park carries no Uptime award. Ark's UK government accreditations run through the Crown Hosting joint venture and are not Tier certifications.
How is the Hayes site designated in planning?
As a Strategic Industrial Location under the London Plan 2021, on the Bulls Bridge Industrial Estate at North Hyde Gardens.