Projects · Data Centres
South Mimms, Hertsmere, Hertfordshire·In developmentData Centres
Equinix DC01UK / Hertfordshire Campus, South Mimms
- Stage85-acre site acquired, permitted for data centre development (Oct 2025)
- Value£3.9bn
- Next milestoneConstruction start
- Last checked1 November 2026
What has changed on this project, and when
- Next milestone: Construction start2 November 2026 · previously: Detailed planning approvals and groundbreaking. No construction start date has been published.
- Stage: 85-acre site acquired, permitted for data centre development (Oct 2025)2 November 2026 · previously: Outline planning permission granted (January 2025); pre-construction
- Next milestone: Detailed planning approvals and groundbreaking. No construction start date has been published.13 October 2026 · previously: Planning consents; groundbreaking
- Stage: Outline planning permission granted (January 2025); pre-construction13 October 2026 · previously: Committed / planning; construction from ~2027
More Data Centres projects
- Ennis campus (Art Data Centres)Ennis, Co. Clare, Ireland
- Grange Castle Phase 3 (Google)South Dublin, Ireland
- QTS Cambois campus (Blackstone)Cambois, near Blyth, Northumberland
- Culham AI Growth ZoneCulham Science Centre, near Abingdon, Oxfordshire
- North Wales AI Growth Zone (Trawsfynydd / Anglesey)Trawsfynydd, Gwynedd (former nuclear power station) with a second base at Prosperity Parc, Anglesey, North Wales
- Microsoft data campus, Skelton Grange, LeedsSkelton Grange, Stourton, Leeds, West Yorkshire
- Ark Spring Park Extension, CorshamSpring Park, Corsham, Wiltshire
- Ark Longcross Park (LP02), ChertseyLongcross Park, Chertsey, Surrey
- Open the Map Explorer at this projectThe map
- Browse checked projects by sectorEvery project page
- See this week's changes on the mapFollow a sector or a project
The Wire is a free email every weekday morning. It brings you what regulators, government departments, network operators and developers have published, each item dated and linked to its source. Sign up and it lands in your inbox.