Marine Sub Agent

Civil Works Alliance; Greater London; On-site; GBP 45,000 - 65,000; Full time

Benefits offered by this job

Market leading salary

Pension scheme

Generous annual leave

Flexible benefits

Job summary

The Civil Works Alliance (CWA) seeks a Sub Agent to join our Marine preconstruction team in London, ahead of mobilisation to Suffolk, to support Sizewell C’s offshore construction preparations. You will help develop construction methods, assess risks, and ensure readiness for dredging, rock placement, heavy lifting, and piling campaigns in the North Sea.

Reporting to the Marine Preconstruction Manager, you will coordinate ECI activities, develop methodologies, and review subcontractor solutions.

Qualifications

• Experience in a marine or preconstruction environment.
• Experience working for contractor or principal contractor on engineering/construction projects.
• Good appreciation of programme, cost and risk during planning and delivery.
• Strong organisational skills; able to manage multiple tasks/interfaces.
• Effective communication and collaboration with designers, subcontractors and clients.
• Ability to take ownership with limited supervision.

Responsibilities

• Coordinate subcontractor ECI activities for a defined section of works.
• Develop construction methodologies and perform constructability reviews for marine works.
• Review proposed construction solutions for safety, programme, cost and risk impact.
• Identify and manage risks and opportunities for the listed work section.
• Develop scopes of work and technical requirements for subcontract tender packages.
• Assist mobilisation and readiness planning as project transitions to offshore construction.
• Maintain records, reports and technical documentation for assigned workstreams.
• Promote a positive safety culture and support continuous improvement.

Skills

Marine/preconstruction experience

Contractor environment experience

Programme/cost/risk management

Organisational skills

Communication and collaboration

Education

SMSTS

SSSTS

BOSIET

GWO

Job description

Help Shape the UK’s Energy Future

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 the Marine 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

Essential

• 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.

Desirable

• 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.