c.£100m five-year project will provide critical access to Agratas gigafactory in Somerset.
Costain, the infrastructure solutions company, has been appointed to design and build a new junction on the M5 motorway.
Awarded through the Regional Delivery Partnership (RDP) framework, the contract is worth approximately £100m to Costain over a five-year period.
Junction 22A is a new motorway junction being constructed between Burnham-On-Sea and Bridgwater, in Somerset. It will 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.
The junction will consist of north facing slip roads and will alleviate congestion on the motorway south of the Huntspill river.
Costain's role as the project's delivery integration partner and main works contractor will see it design and construct the new junction before handing it over to National Highways upon completion. In its role, Costain will provide a range of best-in-class infrastructure services, including design, engineering, programme delivery and supply chain management. WSP will support Costain as design partner.
"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."
Alex Vaughan Chief Executive Officer of CostainJunction 22A will have north facing slip roads and alleviate congestion on the M5 south of the Huntspill river. Credit - Costain
Costain is a long-term partner to National Highways and last year completed the construction of 41 emergency areas on the M1 ahead of schedule. Costain is also providing specialist technical engineering advice to National Highways under its Specialist Professional and Technical Services Framework (SPaTS3), which will cover the whole of the period for Roads Investment Strategy 3 (2026-2031). The infrastructure solutions company is also National Highways' delivery partner for the M60/M62/M66 Simister Island Interchange scheme. In addition, Costain was recently added to join the Eastern Highways Alliance's EH4 Framework, covering a range of civil engineering and construction works across the East of England.
-ENDS-
Contact
George Parrett
Head of Media
communications@costain.com
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Costain Group plc published this content on January 27, 2026, and is solely responsible for the information contained herein. Distributed via Public Technologies (PUBT), unedited and unaltered, on January 27, 2026 at 07:19 UTC.
Costain Group PLC is a United Kingdom-based sustainable infrastructure solution company. The Company offers a range of services across the whole lifecycle of its customers' assets. The Company operates through two segments: Natural Resources and Transportation. The Company offers various services, such as consultancy and advisory, digital technology solutions, and complex program delivery. The Company shape, create and deliver pioneering solutions that transform the performance of the infrastructure ecosystem. It is focused on four strategic markets in the United Kingdom: transport, water, energy, and defense. The Company is involved in research and development in its highways, integrated transport, aviation, energy, defense, water, and rail sectors. Its energy services include energy transition, oil and gas, electricity and gas networks, and industrial cooling. The sectors it operates in are rail, integrated transport, road, water, aviation, and defense and nuclear energy.
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