Commercial Manager IPTP

Shape Britain’s Energy Future with Sizewell C

Location:

Suffolk, Bristol or London

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).

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 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.

Join the team at Sizewell

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