Marine Sub Agent

Sizewell C Limited; Greater London; On-site; GBP 60,000 - 90,000; Full time

Benefits offered by this job

Market leading salary

Generous annual leave

Pension scheme

Flexible benefits

Job summary

Sizewell C Limited is seeking a Marine Sub Agent to join the Civil Works Alliance team in London, with mobilisation to Suffolk. You will develop construction methods, assess risks, and prepare for offshore dredging, piling, and grouting campaigns in the North Sea.

Lead ECI coordination and deliver constructability reviews with a focus on safety and schedule. Join a dynamic alliance delivering Sizewell C’s marine and tunnel works, reporting to the Marine Preconstruction Manager and working

Qualifications

• Experience in a marine/preconstruction environment.
• Experience in a contractor/principal contractor setting on engineering or construction projects.
• Good appreciation of programme, cost and risk in planning and delivery.
• Strong organisational skills with ability to manage multiple tasks.
• Effective communication with colleagues, designers, subcontractors and clients.
• Ability to take ownership and work with limited supervision.
• Experience in marine operations, offshore construction or major infra projects.
• Familiarity with CDM Regulations 2015.
• Experience with subcontractor procurement and tendering.
• Understanding of marine logistics and vessel operations.

Responsibilities

• Coordinate subcontractor Early Contractor Involvement (ECI) activities to outputs defined in project requirements.
• Develop construction methodologies and perform constructability reviews for marine works.
• Review proposed solutions for safety, programme, cost and risk impacts.
• Identify and manage risks and opportunities for the defined works section.
• Develop scopes of work and technical requirements for tender packages.
• Support mobilisation and readiness planning as the project transitions to offshore construction.
• Maintain records and technical documentation for assigned workstreams.
• Promote a positive safety culture and continuous improvement.

Skills

Marine experience

Preconstruction

Contractor involvement

Safety culture

CDM knowledge

Communication

Multitasking

Risk management

Tools

SMSTS

SSSTS

BOSIET

GWO

Job description

Marine Sub Agent Opportunity with the Civil Works Alliance (CWA), Supporting Sizewell C

As part of the CWA (Civil Works Alliance), you will support the building of Sizewell C. Sizewell C will be a 3.2-gigawatt power station generating low‑carbon electricity for around 6 million homes and will play a key role in our energy future, supplying reliable, clean electricity for at least 60 years.This role will be within theMarine and Tunnels Section.

What will you do?

The Civil Works Alliance (CWA) is delivering the critical civil works for the Sizewell C nuclear power plant project. Within the Marine and Tunnel (M&T) portion, we are seeking a Sub Agent to join our marine preconstruction team in London initially ahead of mobilisation to Suffolk. This role offers the opportunity to be part of a dynamic alliance of world‑class contractors, working on one of the UK’s most significant infrastructure projects.

Reporting to the Marine Preconstruction Manager for the Marine and Tunnel Portion, the Sub Agent will play a key role in developing construction methods, assessing delivery risks and opportunities, and ensuring readiness for offshore dredging, rock placement, heavy lifting, monopile installation, drilling and grouting campaigns in the North Sea.

• Coordinate subcontractor Early Contractor Involvement (ECI) activities for a defined section of the works, ensuring outputs are delivered in line with project requirements.
• Develop construction methodologies and undertake constructability reviews for marine construction activities, including:
  • Onshore work hubs and muster ports supporting offshore operations
  • Marine logistics, vessel navigation and mooring arrangements
  • Heavy lifting and transportation operations
  • Large diameter drilling and piling activities
  • Grouting operations
• Review and assess proposed construction solutions, identifying impacts on safety, programme, cost and risk.
• Identify and manage risks and opportunities associated with the section of works.

Develop scopes of work and technical requirements for subcontract tender packages and support procurement activities, including subcontractor evaluations

• Support mobilisation and readiness planning as the project transitions from preconstruction into offshore construction and delivery.
• Maintain accurate records, reports and technical documentation relating to assigned workstreams.
• Promote a positive safety culture and actively support continuous improvement initiatives across the project team.

What are we looking for?

Knowledge & Skills

• Experience within a marine or preconstruction environment.
• Experience working within a contractor or principal contractor organisation on engineering or construction projects.
• Good appreciation of programme, cost and risk considerations during project planning and delivery.
• Strong organisational skills, with the ability to manage multiple tasks and interfaces simultaneously.
• Effective communication skills and the ability to work collaboratively with colleagues, designers, subcontractors and clients.
• Ability to take ownership of assigned tasks and deliver them with limited supervision.
• Experience of marine operations, offshore construction, ports, coastal or major infrastructure projects.
• Familiarity with the Construction Design and Management Regulations 2015 (CDM).
• Experience contributing to subcontractor procurement and tendering activities.
• Understanding of marine logistics, vessel operations or offshore construction techniques.
• Professional accreditation or working towards chartership with a relevant institution.
• Relevant qualifications such as SMSTS, SSSTS, BOSIET, GWO

What we will offer you?

The CWA is a single delivery organisation made of up of the client (Sizewell C) and three parent companies - Balfour Beatty, Bouygues and Laing O'Rourke - which offer industry leading packages including market leading salaries, generous annual leave entitlements, pension scheme and other flexible benefits.

About Us

The CWA celebrates the creativity and innovation that comes from a diverse workforce, and we welcome applications from people of all backgrounds — especially those from under‑represented communities. Our project is built on five core values: Humility, Positivity, Respect, Solidarity, and Clarity.

By joining us, you’ll be encouraged to bring your whole self to work, speak up, and share your ideas. We encourage applications from all suitably qualified candidates, regardless of gender, race, disability, age, sexual orientation, gender reassignment, religion or belief, marital status, or pregnancy and maternity.

We are committed to protecting your privacy. If you decide to apply, please avoid including sensitive personal data in your CV.