Senior Commercial Manager – 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 £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.
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, be open to others’ points of view and ideas, 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
Our vision is to Lead The Way On Nuclear. The Sizewell C team is one of the most exciting and largest new megaprojects in the UK, whilst being at the forefront of the UK’s climate change agenda and energy policy.
We have begun constructing a 3.2‑gigawatt nuclear power station on the Suffolk coast in the East of England replicating, wherever possible, the design used for Hinkley Point C.
When built, Sizewell C will be one of the largest power stations to operate in the UK, generating low‑carbon electricity for at least 60 years, supplying over 6 million homes and supporting around 7% of the UK’s current electricity needs.
We are the first nuclear power station in the UK to be funded under the Regulated Asset Base funding model (RAB). Our largest shareholder is the UK Government, alongside equity partners La Caisse, Centrica, EDF and Amber Infrastructure.
Sizewell C operates within a complex and fast‑moving stakeholder environment, engaging with a wide range of partners including government bodies, regulators, local communities, supply chain partners, and international collaborators. This makes Sizewell C a uniquely stimulating place to work — where navigating evolving priorities, balancing interests, and building trusted relationships is just as critical as technical excellence. For those who thrive in dynamic, multi‑dimensional settings, it offers unmatched professional challenge and growth.
When joining Sizewell C, you may wonder why you are contacted by colleagues with an EDF email or see the EDF logo on portals that you access and/or documentation you receive; this is because we have partnered with EDF for the provision of a number of support services whilst we complete a successful transition out of the EDF group.
At Sizewell C we encourage and embrace diversity and how it can improve our experience and performance at work. It is a requirement that those who join us have the right to work in the UK. Whilst sponsorship may be a possibility that we can explore, we are fully committed to local recruitment where possible, and those already holding the right to work in the UK.
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.
By submitting an application to this role, you acknowledge that you have read and understood Sizewell C’s employee privacy policy and EDF's employee privacy policy. Just to let you know, EDF will be processing and sharing information about your application on behalf of Sizewell C.
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