IN Brief:
- AtkinsRéalis has signed a five-year framework agreement for Sizewell C civil works.
- The scope covers permanent civil works design, including conventional island, heat sink buildings, balance of plant, and ancillary works.
- The appointment supports transfer of Hinkley Point C learning into the next UK nuclear construction programme.
AtkinsRéalis has signed a new five-year framework agreement to continue its civil works role at Sizewell C, strengthening its position on one of the UK’s largest infrastructure programmes.
Under the agreement, the company will act as design partner for the permanent civil works at the Suffolk nuclear project. Its remit covers multidisciplinary design and engineering services across permanent plant design, including the conventional island, balance of plant, heat sink buildings, and ancillary works.
AtkinsRéalis has been involved in design and engineering management at Sizewell C since 2019. The company has also carried experience from Hinkley Point C into the programme, where replication, digital design, data-led engineering, and construction learning are central to the delivery case for the new nuclear station.
Sizewell C is planned around the same European Pressurised Reactor technology being deployed at Hinkley Point C. The project’s construction model depends heavily on converting Hinkley learning into better productivity, clearer documentation, stronger design maturity, and reduced delivery uncertainty. Repetition does not remove complexity, but it can reduce avoidable reinvention.
Permanent civil works sit close to the project’s critical path. Conventional island structures, cooling-related buildings, ancillary plant, foundations, interfaces, embedded components, and services corridors must be designed around nuclear-grade quality control and long-term operational requirements. Design errors or late changes can have significant consequences because civil works often lock in mechanical, electrical, safety, and access decisions for decades.
Digital design and data-led coordination are becoming more important as nuclear construction programmes generate large volumes of design information, quality records, configuration data, safety documentation, and supplier evidence. Keeping that information consistent across design, procurement, fabrication, installation, inspection, and handover is a major delivery task in its own right.
The latest civil works agreement also gives the supply chain another signal that Sizewell C is moving from strategic policy commitment into a more active delivery structure. Major nuclear projects require long lead times for design finalisation, specialist procurement, workforce planning, supplier qualification, quality systems, temporary works, logistics, and site infrastructure.
Early alignment across those systems can reduce disruption later in the programme. Nuclear projects become more difficult and expensive when design maturity trails procurement or when site work begins before documentation, interfaces, and quality requirements are fully understood. The civil works design partner therefore carries influence well beyond drawings and calculations.
The wider UK infrastructure market is also competing for the same scarce project controls, civil engineering, concrete, steel, M&E, planning, environmental, and digital delivery skills needed across energy, transport, water, and defence programmes. Sizewell C will need to secure and retain a significant share of that capacity over several years.
AtkinsRéalis’ role will be judged by how effectively programme-level replication becomes practical design and construction output. Lessons from Hinkley Point C only deliver value when they appear in standardised methods, mature information, clearer interfaces, procurement-ready packages, and construction sequences that reduce uncertainty on site.
The agreement also reinforces the construction sector’s role in energy security. New nuclear delivery is often discussed through finance, policy, and planning, but the project ultimately depends on civil engineering, building services, logistics, specialist materials, digital coordination, and quality management at scale.
Sizewell C will test whether the UK can rebuild large-scale nuclear delivery capability through continuity rather than a succession of bespoke projects. The five-year civil works agreement gives AtkinsRéalis a central role in that effort, with design certainty, constructability, and information control all sitting close to the programme’s ability to move from preparation into sustained delivery.
