Senior Commercial Manager (Sizewell C)

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Senior Commercial Manager 
Sizewell C
 

Location: London, Manchester, Bristol
Contract Type:  Permanent - Office-based with hybrid flexibility (typically 2–3 days per week) 
Working Pattern: Full time 
Closing Date: Friday 12th June 2026 

Why Join Us? 
 

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 chance to lead at scale and play a pivotal role in Britain’s journey to energy security and Net Zero. 
 

What’s in It for You 

Salary: Circa £82,000 (depending on experience) 
Bonus: 5% annual target 
Holiday: 28 days + bank holidays 
Pension: Market-leading (up to 7.5% employee / 15% employer) 
Benefits: Health cover, cycle-to-work scheme, discounts & more 
Hybrid working & ongoing professional development.
 

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 Do 

• Lead the commercial management of major programmes within heavy civils or large-scale engineering and infrastructure projects. 
• Manage and administer NEC3 and NEC4 Engineering and Construction Contracts, ensuring compliance with contract conditions and effective delivery. 
• Prepare and maintain key NEC documentation, including early warning notices, compensation events and programme submissions. 
• Draft position papers, prepare commercial reports and author change events to support project decisions. 
• Apply your understanding of construction technology, cost drivers and supply chain management to optimise outcomes. 
• Mentor and develop junior team members, building capability across the commercial function. 
• Engage confidently with senior stakeholders and clients, providing clear advice and updates. 
• Take ownership of challenges and deliver solutions from start to finish without the need for direction. 
• Contribute to strategic commercial planning and decision-making to support project success. 
 

What You’ll Bring 

• Proven experience in major projects and NEC3/4 or FIDIC contracts 
• Strong commercial, negotiation, and stakeholder management skills 
• Knowledge of UK contract law and procurement best practices 
• Degree or equivalent experience 
• Professional membership (RICS, CICES, IOB, CIPS) desirable 

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.

For this role you must have evidence of right to work in the UK. As a project, we do not discriminate on the grounds of age, gender, race, colour, religion, disability or sexual orientation, and we welcome applications from all sections of the community.