London is one of Europe’s two largest colocation markets and the natural landing point for transatlantic connectivity. LINX and a deep carrier ecosystem give the metro exceptional interconnection choice, and the financial-services cluster keeps demand for low-latency, high-resilience capacity structurally high.
Capacity is spread across distinct submarkets: Docklands and the City for interconnection-dense sites, and the western corridor — Slough and the M4 belt — for larger campuses where much of the newer, higher-density inventory is built. Power availability in West London has been a constraint in recent years, which makes delivery timelines and secured grid connections a key question to put to operators.
Post-Brexit, the UK sits outside the EU’s legal framework; UK GDPR remains closely aligned, but organisations with strict EU-data-residency requirements sometimes pair a London deployment with an EU metro. The snapshot below shows how the listed London inventory compares on power bands, cooling and certifications — a practical starting point before you request proposals.
Market snapshot
Aggregated from operator data for the London Metro area. Counts reflect facilities that report each attribute.
- Facilities
- 85
- Operators
- 46
- Available now
- 3
- Max rack density
- 125 kW/rack
- Power bands
- 5-20MW (20) · 1-5MW (13) · 20-50MW (9) · 50MW+ (2)
- Cooling
- Air cooling (46) · Free cooling (27) · Liquid-ready (11) · Indirect evaporative (7)
- Common certifications
- ISO 27001 (74) · ISO 9001 (64) · PCI DSS (59) · ISO 14001 (56) · ISO 50001 (46)
4D Data Centres Ltd · Crawley · London Metro · United Kingdom
On request- Tier
- III
- Power
- 1-5MW
- Cooling
- Air cooling, Rear-door heat exchanger, Immersion
- Certs
- ISO 27001 +2
4D Data Centres Ltd · Byfleet · London Metro · United Kingdom
On request- Tier
- III
- Certs
- ISO 27001 +4
Thames Network Limited · London · London Metro · United Kingdom
Available- Tier
- III
- Cooling
- Air cooling
- Density
- 13 kW/rack
Ark Data Centres · Hayes · London Metro · United Kingdom
On request- Power
- 50MW+
- Cooling
- Air cooling, Liquid-ready
- Certs
- ISO 14001 +8
Templus · London · London Metro · United Kingdom
On request- Tier
- III
- Power
- 1-5MW
- Density
- 12 kW/rack
- Certs
- ISO 27001 +1
Centersquare · London · London Metro · United Kingdom
On request- Tier
- III
- Certs
- ISO 27001 +4
China Mobile International Limited · Slough · London Metro · United Kingdom
On request- Tier
- III
- Cooling
- Air cooling, Free cooling, Liquid-ready
- Certs
- Uptime Institute Tier III TCOS +5
Cogent Communications, Inc. · London · London Metro · United Kingdom
On requestColt Technology Services Group · London · London Metro · United Kingdom
On request- Tier
- III
- Certs
- ISO 9001 +3
Colt Technology Services Group · London · London Metro · United Kingdom
On request- Tier
- III
- Certs
- ISO 14001 +2
CapitaLand Digital Holdings Pte Ltd. · Croydon · London Metro · United Kingdom
On requestCustodianDC LTD. · Dartford · London Metro · United Kingdom
On request- Tier
- III
- Power
- 5-20MW
- Cooling
- Air cooling, Free cooling
- Certs
- ISO 27001 +5
CyrusOne Data Centers · Slough · London Metro · United Kingdom
On request- Tier
- III
- Power
- 5-20MW
- Cooling
- Free cooling
- Certs
- ISO 27001 +5
CyrusOne Data Centers · Slough · London Metro · United Kingdom
On request- Tier
- III
- Power
- 5-20MW
- Cooling
- Air cooling, Indirect evaporative, Free cooling
- Certs
- ISO 27001 +6
CyrusOne Data Centers · West Drayton · London Metro · United Kingdom
On request- Tier
- III
- Power
- 5-20MW
- Cooling
- Free cooling, Liquid-ready
- Certs
- ISO 27001 +6
CyrusOne Data Centers · Slough · London Metro · United Kingdom
On request- Tier
- III
- Power
- 5-20MW
- Cooling
- Air cooling, Indirect evaporative, Free cooling
- Certs
- ISO 14001 +5
CyrusOne Data Centers · Slough · London Metro · United Kingdom
On request- Tier
- III
- Power
- 5-20MW
- Cooling
- Air cooling, Free cooling
- Certs
- ISO 27001 +5
DataBank, Ltd. · Feltham · London Metro · United Kingdom
On request- Tier
- III
- Power
- 1-5MW
- Certs
- ISAE 3402 +7
Digital Realty Trust · Crawley · London Metro · United Kingdom · map position unknown
On request- Tier
- III
- Cooling
- Indirect evaporative
- Certs
- ISO 27001 +7
Digital Realty · Woking · London Metro · United Kingdom
On request- Tier
- III
- Cooling
- Air cooling
- Certs
- ISO 27001 +7
Digital Realty · Crawley · London Metro · United Kingdom · map position unknown
On request- Tier
- III
- Power
- 5-20MW
- Cooling
- Indirect evaporative
- Certs
- ISO 9001 +12
Digital Realty · Chessington · London Metro · United Kingdom
On request- Tier
- III
- Cooling
- Air cooling, Free cooling
- Certs
- ISAE 3402 +7
Digital Realty · West Drayton · London Metro · United Kingdom
On request- Tier
- III
- Cooling
- Air cooling
- Certs
- ISO 27001 +9
Digital Realty · London · London Metro · United Kingdom
On request- Tier
- III
- Cooling
- Air cooling
- Certs
- SOC 2 +8
Digital Realty · London · London Metro · United Kingdom
On request- Tier
- III
- Cooling
- Free cooling, Liquid-ready
- Certs
- ISO 27001 +8
Digital Realty · London · London Metro · United Kingdom
On request- Tier
- III
- Cooling
- Air cooling
- Certs
- PCI DSS +7
Digital Realty · Slough · London Metro · United Kingdom
On request- Tier
- III
- Certs
- ISO 27001 +4
Digital Realty · Slough · London Metro · United Kingdom
On request- Tier
- III
- Certs
- ISO 27001 +4
Digital Realty · London · London Metro · United Kingdom
On request- Tier
- III
- Cooling
- Free cooling
- Density
- 30 kW/rack
- Certs
- ISO 9001 +6
Intercity Technology · Borehamwood · London Metro · United Kingdom
On request- Tier
- III
- Certs
- ISO 27001
Epsilon · London · London Metro · United Kingdom
On request- Tier
- III
- Certs
- ISO 27001 +2
Equinix, Inc. · Slough · London Metro · United Kingdom
On request- Tier
- III
- Cooling
- Free cooling, Hybrid cooling
- Density
- 7 kW/rack
- Certs
- Climate Neutral Data Centre Pact +11
Equinix, Inc. · Slough · London Metro · United Kingdom
On request- Tier
- III
- Cooling
- Indirect evaporative, Free cooling, Liquid-ready
- Density
- 6 kW/rack
- Certs
- ISO 27001 +15
Equinix, Inc. · London · London Metro · United Kingdom
On request- Tier
- III
- Cooling
- Free cooling
- Certs
- ISO 9001 +12
EXA Infrastructure · London · London Metro · United Kingdom
On request- Certs
- ISO 27001 +2
EXA Infrastructure · London · London Metro · United Kingdom
On request- Tier
- III
- Power
- 20-50MW
- Cooling
- Liquid-ready
- Certs
- ISO 27001 +2
FLAG London · London · London Metro · United Kingdom · map position unknown
On requestGlobal Switch · London · London Metro · United Kingdom
On request- Tier
- III
- Power
- 50MW+
- Cooling
- Air cooling
- Certs
- ISO 9001 +5
Global Switch · London · London Metro · United Kingdom
On request- Tier
- III
- Power
- 5-20MW
- Cooling
- Air cooling
- Certs
- ISO 9001 +5
iomart Hosting Limited · London · London Metro · United Kingdom · map position unknown
On request- Tier
- III
- Cooling
- Air cooling
- Certs
- ISO 27001 +7
IP House Ltd · London · London Metro · United Kingdom
On request- Tier
- III
- Power
- 1-5MW
- Cooling
- Air cooling
- Certs
- ISO 9001 +4
Iron Mountain Data Centers · Slough · London Metro · United Kingdom
Available- Tier
- III
- Power
- 5-20MW
- Cooling
- Air cooling
- Certs
- ISO 9001 +13
Harlow Operations Limited · Harlow · London Metro · United Kingdom · map position unknown
On request- Tier
- III
- Power
- 5-20MW
- Cooling
- Air cooling, Free cooling
- Density
- 20 kW/rack
- Certs
- ISO 27001 +13
Kao Data · Slough · London Metro · United Kingdom
On request- Tier
- III
- Power
- 20-50MW
- Certs
- ISO 27001 +11
Keppel Data Centres Holding Pte Ltd · London · London Metro · United Kingdom
On requestiomart Hosting Limited · London · London Metro · United Kingdom
On request- Tier
- II
- Cooling
- Air cooling
- Certs
- ISO 27001 +6
Lumen Technologies Inc · London · London Metro · United Kingdom
On request- Tier
- III
- Certs
- ISO 27001 +1
Lumen Technologies Inc · London · London Metro · United Kingdom
On request- Tier
- III
- Certs
- ISO 27001 +1
Telstra Europe · London · London Metro · United Kingdom
On request- Tier
- III
- Cooling
- Air cooling
- Density
- 5 kW/rack
- Certs
- ISO 27001 +2
Stellanor Data Centers · Hounslow · London Metro · United Kingdom
On request- Tier
- III
- Cooling
- Air cooling
- Certs
- ISO 27001 +8
Showing the first 50 facilities. Refine on the discover page.