Commercial Manager

Location: Greater London

Commercial Manager, Sizewell C

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Job Description

Shape Britain’s Energy Future with Sizewell

C.

Location:

London, Suffolk or Bristol.

Contract:

Permanent, full-time.

Closing Date:
Friday 9th January 2026.

Why Join Us?

We’re building the future, and we need experienced Commercial Leaders to make it happen. Sizewell C is a once-in-a-generation infrastructure project that will power Britain’s energy security and net‑zero ambitions for decades to come. Following our recent Final Investment Decision, construction is fully greenlit. This is your chance to be part of the largest investment that will be providing clean, reliable nuclear energy to six million homes, cutting nine million tonnes of CO₂ annually.

As a Commercial Manager, you’ll play a pivotal role in helping Britain achieve Net Zero and shaping the future of energy.

What’s In It For You?

• Salary:
  Competitive
• 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.

• 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).

Behavioural Competences Humility

• Recognise the value brought from different cultures and experiences.
• Be open to others’ points of view and ideas, be willing to debate and compromise.

Positivity

• Positively challenge poor quality and performance.
• Identify solutions at the lowest possible level.
• Encourage tier‑1s and 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 now and be part of something extraordinary.

Additional Information

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