Sizewell C
Senior Commercial Manager
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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 for the below position.
Senior Commercial Manager
Contract Type:
Permanent - Office-based with hybrid flexibility (typically 3 days p/w in the office)
Working Pattern:
Full time
Closing Date:
Friday 31st July 2026
Location:
London
Salary:
Circa £78,000 depending on experience
Bonus:
5% annual incentive
Pension:
Up to 7.5% employee contribution / 15% employer contribution
Holiday:
28 days plus bank holidays
Benefits:
Flexible benefits
Impact:
Sizewell C is one of the UK's most ambitious infrastructure projects—a next-of-a-kind nuclear power station that will deliver clean, reliable energy for generations. Following our Final Investment Decision, construction is fully greenlit. This is your opportunity to play a key role in delivering a nationally significant project that will support Britain's energy security and Net Zero ambitions.
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We’re looking for a seasoned commercial professional with extensive experience delivering major programmes, ideally within heavy civils or large-scale engineering and infrastructure projects valued between £10m and £100m+. You’ll bring a deep understanding of construction technology, cost drivers, and supply chain management, combined with strong working knowledge of NEC3/NEC4 contracts—particularly in contract management and administration. Your ability to draft position papers, author change events, evaluate complex quotations, and produce clear commercial reports will set you apart.
What You’ll Be Doing:
- Leading the commercial management of major design programmes within heavy civils or large-scale engineering and infrastructure projects.
- Managing and administering NEC3 and NEC4 PSC and bespoke SZC contracts, ensuring compliance with contract conditions and effective delivery.
- Preparing and maintaining key commercial documentation, including early warning notices, compensation events and programme submissions.
- Drafting position papers, prepare commercial reports and author change events to support project decisions.
- Applying your understanding of construction technology, cost drivers and supply chain management to optimise outcomes.
- Mentoring and developing Commercial Managers and Assistant Commercial Managers, building capability across the commercial function.
- Engaging with senior stakeholders and clients, providing clear advice and updates.
- Taking ownership of challenges and deliver solutions from start to finish.
- Contributing to strategic commercial planning and decision-making to support project success.
What You’ll Bring:
- Proven experience in major projects and NEC3/4 contracts
- Strong commercial, negotiation, and stakeholder management skills
- Knowledge of UK contract law and procurement best practices
- Degree or equivalent experience
- Professional membership (RICS, ICES, CIOB, CIPS) desirable or working towards chartership.
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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
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.
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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