Sizewell C
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
- 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.
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 £66,000 depending on experience
Bonus
- 5% annual incentive
Pension
- Up to 7.5% employee contribution / 15% employer contribution
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Holiday
- 28 days plus bank holidays
Benefits
- Flexible benefits
Impact
We're looking for an experienced commercial professional with a strong track record in major infrastructure, engineering, or construction projects. Ideally, you'll have experience within heavy civils and knowledge of NEC3/NEC4 contracts. You'll be confident managing commercial activities across allocated contracts or work packages, supporting project teams, assessing change, managing risk, and helping to deliver successful commercial outcomes.
Your role will be to:
- Manage the commercial administration of allocated contracts and work packages within major infrastructure projects.
- Administer NEC3 and NEC4 contracts, ensuring compliance with contractual obligations and project procedures.
- Prepare and manage commercial documentation, including early warning notices, compensation events, payment assessments, and programme submissions.
- Review and evaluate quotations, subcontractor submissions, and change proposals.
- Support the preparation of position papers, commercial reports, forecasts, and cost analysis.
- Work collaboratively with project, engineering, procurement, and supply chain teams to ensure effective commercial delivery.
- Identify, manage, and mitigate commercial risks and opportunities.
- Build strong relationships with internal and external stakeholders, providing clear commercial advice and support.
- Contribute to cost control, change management, and commercial governance processes.
- Support senior commercial leadership in achieving project and business objectives.
What You'll Bring
- Proven experience working within commercial management on major construction, infrastructure, engineering, or heavy civils projects.
- Good working knowledge of NEC3 and/or NEC4 contracts.
- Strong commercial awareness, contract management, and negotiation skills.
- Experience preparing and administering compensation events, early warnings, and payment applications.
- Ability to analyse commercial data and provide clear recommendations.
- Strong stakeholder management and communication skills.
- Knowledge of UK contract law and procurement practices.
- Degree-qualified or equivalent industry 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 delivery 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.
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