• Hemel Hempstead 3 Data Center

Hemel Hempstead 3 Data Center

With a total of 8,960 sqm of IT space and a maximum of 20 MW of IT load, Hemel Hempstead 3 offers complete solutions for housing your IT and network systems in a secure, high availability environment. We provide you with the best possible physical and technical infrastructure supported by 2N UPS systems, 2N generator backup, as well as highly redundant cooling systems. Hemel Hempstead 3 Data Center holds multiple certifications and is connected to major carrier hubs in Docklands and Slough. It is a fiber-connected campus and fully integrated with other NTT data center facilities allowing clients to grow and has the optimal distance to the Slough data centers and the London 1 Data Center in Dagenham for backup and disaster recovery solutions.

Hemel Hempstead 3 overview

  • 8,960 sqm of data center space
  • 20 MW of critical IT load
  • Fully-fitted colocation space and private suites
  • Multi Service Interconnection Platform
  • Cross Connects
  • 24/7 Remote Hands services

Take a look inside Hemel Hempstead 3

Main entrance

  • Reception and visitor verification desk
  • In-house security staff to secure the site 24x7x365


  • Offices, storage space and pre-installation rooms
  • Common areas such as meeting rooms and kitchen

IT space

  • Fully-fitted: Colocation Rack, Carrier Rack, Dedicated Cage and Dedicated Suite
  • 24/7 Remote Hands services

Download the Hemel Hemsptead 3 Data Center brochure

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Hemel Hempstead 3 specifications


  • 20 MW of critical IT load
  • Dual dedicated 11,000V (HV) grid connections (2N)
  • Dedicated 2N redundant HV substations on-site
  • Minimum N+1 (UPS) with battery back-up
  • N+1 back-up generators
  • Refuelling contracts to ensure timely replacement


  • 24x7 on-site security
  • 3.6m SEAP certified security fence with razor wire topper
  • External and internal IP CCTV system
  • Proximity cards to authorize access levels including man trap access
  • Biometric identification


  • Carrier-neutral
  • Carrier mix from global tier 1 supplier to regional supplier
  • Connectivity and dark fiber infrastructure in place connecting to our other London data centers and the major carrier hubs in the Docklands
  • Multi Service Interconennection Platform to connect our clients to major cloud service providers
  • Redundant Carrier-Meet-Me-Rooms 


  • Primary cooling infrastructure, centrally managed and linked to BMS
  • Room air conditioning units
  • Regulated humidity
  • 1.5 m clear false ceiling void for hot-air return to Air Handling Units (AHU)
  • Contained hot aisle or chimney rack design for high efficiency cooling up to 20 kW per rack

At a glance

At a glance

Experience in the UK

Hemel Hempstead 3 is part of five existing data centers we currently operate in Hemel Hempstead and Slough, six once London 1 opens up in autumn 2020. We have been in the UK market for over 20 years, originally operating as Gyron before being acquired by NTT and becoming part of the Global Data Centers division of NTT Ltd. in 2019.



Serving the London area

Our Hemel Hempstead 3 Data Center is located 24 miles northwest of London, in Hertfordshire, and is part of the Greater London Urban Area. It has attracted many businesses due to its proximity to London and excellent connectivity links, with easy access to the UK motorway network and London airports. Our Hemel Hempstead 3 Data Center is a 45-minute drive from Heathrow International Airport, and a 50-minute drive from central London. 

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