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Cartis diligence evidence schedule

Ark Hilfield Park Campus

PRJ-1306 · Site · Elstree, England, United Kingdom

Record last updated Oct 29, 2026

Scope and capacity

Ark proposes Hilfield Park on the former Mercure Hotel site at Tylers Way, Elstree. The December 2025 application describes four buildings, each with two independently operable wings; Ark’s separately marketed 6+ data centres are not a verified physical-building count. The operator targets approximately 200 MW of compute capacity, power delivery from 2028 and service in 2029. Its 250 MVA supply figure is not IT capacity. Application 25/1781/FUL is listed for Hertsmere’s 5 November 2026 committee, not approved by that listing. Current title, delivered power and operating capacity remain unverified.

Headline: 200 MW Planned / design

Numbers refer to their stated physical boundaries and are not added together. Source dates, claim dates and record updates have different meanings. Missing dates and locators are not inferred.

Planned campus capacity MW · 200 MW

Planned / design or future potential · Ark Hilfield Park Campus (Project)

Claim 162086 · Recorded claim type: Forecast · Review: Approved · Claim date: Not stated

Headline treatment: Selected headline

  1. Operator Hilfield Park campus

    Ark Data Centres (UK) · Document date: Not stated · Primary

    Source reference: SRC-8176 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.ark-d-c.com/locations/elstree

Site location · Former Mercure Hotel and land southeast, Tylers Way, WD25 8JH; one Hilfield Park campus, also marketed as Elstree. Do not confuse supply substations with site location.

Reported rounded · Ark Hilfield Park Campus (Project)

Claim 162087 · Recorded claim type: Reported rounded · Review: Approved · Claim date: Not stated

  1. Applicant-authored planning statement, archived copy

    Ark Estates 5 Limited / Savills · Document date: Not stated · Primary

    Source reference: SRC-8177 · Company announcement · Recorded authority: Party primary

    Source URL

    https://docs.planning.org.uk/20251224/199/T7AXMLIFJD600/txts3fvk4ihe1qkg.pdf

Land and site control context · Applicant says site held freehold; title not independently inspected.

Reported rounded · Ark Hilfield Park Campus (Project)

Claim 162088 · Recorded claim type: Reported rounded · Review: Approved · Claim date: Not stated

  1. Applicant-authored planning statement, archived copy

    Ark Estates 5 Limited / Savills · Document date: Not stated · Primary

    Source reference: SRC-8177 · Company announcement · Recorded authority: Party primary

    Source URL

    https://docs.planning.org.uk/20251224/199/T7AXMLIFJD600/txts3fvk4ihe1qkg.pdf

Planning and marketing scope · The December 2025 planning application proposes four buildings (HP1–HP4), each with two independently operable wings. Ark separately markets 6+ data centres; the sources do not establish that marketing count as a physical building count.

Actual · Ark Hilfield Park Campus (Project)

Claim 162488 · Recorded claim type: Actual · Review: Approved · Claim date: Not stated

  1. Operator Hilfield Park campus

    Ark Data Centres (UK) · Document date: Not stated · Primary

    Source reference: SRC-8176 · Company announcement · Recorded authority: Party primary

    Source URL

    https://www.ark-d-c.com/locations/elstree

  2. Applicant-authored planning statement, archived copy

    Ark Estates 5 Limited / Savills · Document date: Not stated · Primary

    Source reference: SRC-8177 · Company announcement · Recorded authority: Party primary

    Source URL

    https://docs.planning.org.uk/20251224/199/T7AXMLIFJD600/txts3fvk4ihe1qkg.pdf

Reviewed hilfield committee listing · As checked on 3 November 2026, Hertsmere lists application 25/1781/FUL as item 5B for its scheduled 5 November 2026 Planning Committee. The listing is not planning approval, and the officer report was not accessible in this review.

Reported rounded · Ark Hilfield Park Campus (Project)

Claim 162654 · Recorded claim type: Reported rounded · Review: Approved · Claim date: Not stated

  1. Hilfield Park planning committee agenda — 5 November 2026

    Hertsmere Borough Council · Document date: Not stated · Primary

    Source reference: SRC-8332 · Government record · Recorded authority: Official primary

    Source URL

    https://hertsmere.moderngov.co.uk/ieListDocuments.aspx?CId=418&MId=12153

Counterparties and capital

Ark Data Centres (UK) · Developer, Operator · CMP-1727

This schedule captures public Cartis research. It is not a title, lien or legal-opinion report. Document page/section locators and claim review timestamps are included only when published; this version has no separate locator or claim-review-time feed.