Senior Commercial Manager

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

Job summary

A pioneering energy company in the UK is seeking a skilled professional to lead commercial management for major infrastructure projects. This full-time role requires proven experience with NEC contracts and strong stakeholder management skills. The successful candidate will manage key documentation, mentor junior staff, and engage with senior stakeholders. The position offers a competitive salary, a target bonus, and various benefits including hybrid working options and professional development opportunities.

Benefits

Competitive salary

5% annual target bonus

28 days + bank holidays

Market-leading pension

Health cover

Hybrid working & ongoing professional development

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.
• Professional membership (RICS, CICES, IOB, CIPS) desirable.

Responsibilities

• Lead the commercial management of major programmes within heavy civils.
• Manage NEC3 and NEC4 Engineering and Construction Contracts.
• Prepare key NEC documentation.
• Draft position papers and commercial reports.
• Mentor and develop junior team members.

Skills

Commercial management

Stakeholder management

Negotiation

Education

Degree or equivalent experience

Job description

Job Overview

Shape Britain’s Energy Future with Sizewell C – a next‑of‑a‑kind nuclear power station delivering clean, reliable energy for generations. Following the Final Investment Decision, construction is fully greenlit. This role offers an opportunity to lead at scale and play a pivotal role in Britain’s journey to energy security and Net Zero.

Location & Contract

London, Suffolk, Bristol
Permanent – Office‑based with hybrid flexibility (2–3 days per week)
Full time
Closing Date: Friday 9th January 2026

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, 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 knowledge 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.

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.
• Degree or equivalent experience.
• Professional membership (RICS, CICES, IOB, CIPS) desirable.

Benefits

• Competitive salary (depending on experience).
• 5% annual target bonus.
• 28 days + bank holidays.
• Market‑leading pension (up to 7.5% employee / 15% employer).
• 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; 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!