CGI of the UK’s biggest data centre campus, Union Park.

Union Park UP1/EC1

Client: ARK Data Centres

ARK Data Centres - Designing and operating data centres which empower businesses to work from anywhere in the world.


Hayes, Middlesex


93 weeks

Contract value



2022/23 – completes November 2023

The brief:

Construction of 21 Data Halls of approximately 1250m2 each, to be deployed at approximately 3MW per hall. A stand-alone High Voltage energy Centre closely linked to 2 stand-alone Medium Voltage energy centres to host back up gas generation. The building mass consists of a series of staggered blocks, surrounded by an internal one-way circulation system with both soft and hard landscaping. The MV energy centres located either side of North Hyde Gardens are smaller in scale providing a stepping down effect towards the Grand Union Canal. The HV energy centre is located to the east of the MV energy centre on the southern side of North Hyde Gardens. A single storey Visitor Reception Centre, that will enable security protocols for visitors and employees to take place is located on the south side of North Hyde Gardens. 

Key challenges:

  • Challenging site with live sewer, bordering rail lines into London, River Crane, Canal and road network
  • Significant logistics, delivery and storage constrictions
  • Challenging programme and key date deliveries for Alliance Partners
  • Design changes throughout the project to accommodate end client requirements

The solution:

  • Close collaboration and engagement amongst the Alliance Partners
  • The use of specialist Tier 1 Contractors
  • In depth forward planning and co-ordination of work areas, deliveries and logistics 
CGI of the UK’s biggest data centre campus, Union Park.

As a trusted and key partner of Ark Data Centres, Sweet Projects go above and beyond in challenging the status quo and enabling us and our clients to push the boundaries of the possible in the delivery of our projects keeping us at the forefront of data centre provision in the UK.

- Andy Garvin - Chief Operating Officer, Ark Data Centres