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Sizewell C’s Business
Sizewell C’s business is to design, finance, construct, commission, operate, maintain, and eventually decommission the nuclear power plant and related infrastructure at Sizewell C in Suffolk. Overall, whilst the Company is in the construction phase, the Boards’ principal focus is on the development and construction of Sizewell C on time, on budget and to the highest quality and safety standards. The Company is maturing to meet all these requirements.
Sizewell C is economically regulated by OFGEM under the Regulated Asset Base (RAB) model similar to other UK electricity distribution networks and Thames Tideway.
Sizewell C construction strategy is to replicate the design of Hinkley Point C, using the majority of the same supply chain, but innovating in the way it is delivered to achieve savings in time and cost of around 20%. The CCO will need to be guided by and incorporate lessons learned from the Hinkley Point C commercial delivery to achieve Sizewell C’s ambition.
Following Financial Completion and Revenue Commencement, Sizewell C is fully funded and is owned by; The Secretary of State for Energy Security and Net Zero representing HM Government, La Caisse, Centrica, EDF and Amber Infrastructure. Sizewell C is entering an exciting phase of growth as we mature into an independent organisation and continue building one of the UK’s largest and most important energy projects. We are now recruiting the below position.
Commercial Manager
Location: London, Suffolk
Contract: Permanent, full-time
Closing date: Friday 17th July 2026
What’s in It for You
- Salary: Competitive (depending on experience)
- Bonus: 5% annual incentive
- Pension: Up to 7.5% employee / 15% employer contribution
- Leave: 28 days holiday plus bank holidays
- Hybrid Working: Typically, 2–3 days in the office per week, with flexibility based on business needs
Your Impact
As Commercial Manager you will join our Supply Chain team and take ownership of the commercial management of Design, Engineering, and Construction contracts. You’ll work closely with Programme Delivery, Finance, Legal, and suppliers to ensure contracts deliver on cost, quality, and schedule.
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- Lead all commercial and contract management activities for complex projects.
- Administer NEC3/NEC4 or FIDIC contracts, including drafting clear contract documentation.
- Manage supply chain engagement, including procurement, subcontractor quotation reviews, and contract negotiations.
- Produce accurate cost reports, forecasts, and budgets, ensuring robust cost assurance.
- Represent the project in client-facing commercial meetings.
- Mentor and guide Assistant Commercial Managers and junior team members.
- Support project controls and reporting using systems such as CEMAR, SAP, Oracle, or similar.
What We’re Looking For
- Solid experience on major programmes or multi-discipline projects.
- Strong understanding of NEC3/NEC4 or FIDIC contracts and contract administration responsibilities.
- Proven experience in a commercial or contract management role.
- Excellent numerical and analytical skills with the ability to produce accurate cost reports.
- A clear self-starter, confident in taking ownership and seeking additional responsibility.
- Ideally Chartered status (RICS, ICE, CICES, IOB, CIPS or equivalent) or working towards.
- Stakeholder management and negotiation skills.
Nice-to-haves
- Ideally Degree-qualified in Quantity Surveying, Commercial Management or Engineering or related field.
- Experience in nuclear or regulated industries.
- Understanding of the UK nuclear regulatory environment and supply chain landscape.
- Familiarity with safety case and licence conditions in nuclear.
- Familiarity with project controls systems (CEMAR, SAP, Oracle).
Why Join Us
- A major infrastructure project with national impact.
- Hybrid working with flexibility built in.
- Competitive salary, bonus and benefits.
- Clear progression and development opportunities.
- Supportive, collaborative team environment.
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Behavioural Competences
Humility
Recognise the value brought from different cultures and experiences. Be open to other’s points of view and ideas, be willing to debate and to compromise.
Positivity
Positively challenge poor quality and performance. Identify solutions at the lowest possible level. Encourage others to bring new ideas forward.
Respect
Value the rules and environment in which we operate. Give and receive feedback with respect. Embrace and engage with new people and ideas.
Solidarity
One team, working closely together and helping each other. Empowered teams always looking forward. Shared responsibility for delivering the project outcomes.
Clarity
Communicate clearly and consistently. Promote collaboration and team alignment. Clearer and faster decision making. Drive simplification at all levels.
If this sounds like the next step in your career, we’d love to hear from you. Apply today.
Additional Information
When joining Sizewell C, you may wonder why you are contacted by colleagues with an EDF email or see the EDF logo on portals that you access and/or documentation you receive; this is because we have partnered with EDF for the provision of a number of support services whilst we complete a successful transition out of the EDF group.
At Sizewell C we encourage and embrace diversity and how it can improve our experience and performance at work. It is a requirement that those who join us have the right to work in the UK. Whilst sponsorship may be a possibility that we can explore, we are fully committed to local recruitment where possible, and those already holding the right to work in the UK.
To be appointed to this role, you will need to meet the criteria for Security Vetting, which will, ordinarily, require you to have been a resident of the UK for at least three of the past five years.
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