Job Description

The Sizewell C Jobs Service supports local people into exciting, long-term careers across our Project.#SZCJobs

Commercial Assistant
Sizewell C

Location: London
Contract: Permanent, full-time. 
Closing date: Wednesday 22nd July 2026

What’s in It for You

Salary: £30,127-38,000 depending on experience
Bonus: 5% annual incentive
Pension: Up to 7.5% employee / 15% employer contribution
Leave: 28 days holiday plus bank holidays

The Opportunity:

Join a friendly, diverse, and high-performing team directly involved in Europe's biggest construction project - delivering a reliable, low-carbon energy supply for decades to come. As Project Support Administrator, you'll provide essential support to the SZC Contracts and Procurement Team, working with senior stakeholders whilst maintaining the highest standards of integrity and confidentiality:

Key Responsibilities

Divisional / Departmental support.
Provide high level administrative support to the head of commercial.
Duties include complex diary and email management, preparing briefs and presentations, coordinating cross departmental communications and ensuring smooth daily operations of divisional office.
Assist the secretariat for monthly Commercial Approval
Assist the secretariat for the bimonthly Commercial Approval Committee (CODEM). This includes collating and distributing papers, ensuring submissions have correct authorisations, recording minutes and actions, and following up on decisions. The role acts as the deputy secretariat function for CODEM.
Assurance, Audit & Regulatory administration
Provide support to the assurance, audit, and regulatory compliance activities. Responsibilities include preparing documentation for audits, maintain registers (e.g risk, actions, tracking deadlines for submissions and organising evidence for internal / external reviews.
Team Coordination
Maintain and Build relationships with key contacts and stakeholders
Maintain confidentiality of all commercial and personal information
Maintain data/records so that information is readily available and easily accessible
Arrange meetings and co-ordinate the booking of rooms, arrange travel, accommodation, pool/hire vehicles and hospitality as required
Creation of presentations and reports for the wider team
Support to document management lead – management of the transfer of information to
The successful candidate will be confident in working with many different people, you will also interface with other teams across the SZC Project, such as Finance, supply chain and Site delivery.

The role is mostly desk based, with some hybrid working arrangements with the office based in London, so it requires lots of time in Teams calls and using on-line communications.

Skills & Attributes:

The ideal candidate will be:

Excellent communication skills and attention to detail.
Ability to build positive relationships with stakeholders at all levels.
A proactive approach and willingness to learn.
Strong organisational skills and ability to manage competing priorities.
Proficiency in Microsoft Office (Excel, Word, PowerPoint).
Good understanding of Power BI and other reporting tools
Able to organise their own time and others, working in an environment where priorities and requirements can change quickly.
Able to work largely unsupervised, and confident in personal organisation.
is comfortable talking to a wide range of people at lots of levels in a large organisation.

Other Details:

Location can be based in London or hybrid working with routine trips to London and occasional visits to Site.
Full-time 37 hours per week.
Laptop will be provided.
Requires BPSS security vetting.

Key Competencies 

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 today. 

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.