Costain Awarded Contract for New M5 Junction

Costain Group PLC

27 January 2026

Costain awarded contract for new M5 gigafactory junction

Costain Group PLC ("Costain") today announces that it has been awarded a contract to design and build a new junction on the M5 motorway, junction 22A.

Awarded through the Regional Delivery Partnership framework, the contract is worth approximately £100m to Costain over a five-year period.

Junction 22A is a new motorway junction being constructed in Somerset to provide access to the Gravity Smart Campus and £4bn gigafactory being developed by Agratas, which will be Britain's biggest electric vehicle battery manufacturing facility. Costain's role as the project's delivery integration partner and main works contractor will see it manage the design and construction of the new junction, providing a range of services, including design, engineering, programme delivery and supply chain management.

Alex Vaughan, Chief Executive Officer of Costain, commented: "This award is built on our long-established highways delivery expertise and trusted partner relationship with National Highways. We will work closely with our supply chain partners to design and deliver this new junction that will provide access to the new gigafactory and help to drive economic growth in this region of the UK.

"This investment, supporting the UK's growth ambitions, is another example of Costain's commitment to deliver critical national infrastructure programmes that improve people's lives."

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Costain improves people's lives by creating connected, sustainable infrastructure that enables people and the planet to thrive. Through the delivery of predictable, best-in-class solutions across the transport, water, energy and defence markets, we are creating a sustainable future and securing a more prosperous, resilient and decarbonised UK.