Senior Commercial Manager

Sizewell C Ltd; Brighton; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A major infrastructure project firm in the UK seeks a Senior Commercial Manager to oversee commercial management within large-scale engineering projects. The ideal candidate will have experience with NEC3/4 contracts and demonstrate strong negotiation and stakeholder management skills. This hybrid role requires a degree or equivalent experience. Competitive salary and benefits package including a pension plan and bonuses are offered.

Benefits

Competitive salary

5% annual bonus

28 days holiday + bank holidays

Market-leading pension plan

Health cover

Cycle-to-work scheme

Qualifications

• 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.

Responsibilities

• 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.
• Prepare and maintain key NEC documentation including compensation events.
• Draft position papers and prepare commercial reports.

Skills

Commercial management

Negotiation skills

Stakeholder management

Understanding of construction technology

Contract management

Education

Degree or equivalent experience

Professional membership (RICS, CICES, IOB, CIPS)

Job description

Job Description

Shape Britain’s Energy Future with Sizewell C

Location: London, Suffolk, Bristol

Contract Type: Permanent - Office-based with hybrid flexibility (typically 2–3 days per week)

Working Pattern: Full time

Closing Date: Friday 9th January 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.

Senior Commercial Manager

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 £10 m and £100 m+. 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.

Security and Right to Work

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. You must have the right to work in the UK.

What’s in It for You

Salary: Competitive salary (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

Key Competencies

• Humility – Recognise the value brought from different cultures and experiences.
• 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 of 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!