Cost Assurance Assistant

Sizewell C Limited; Ipswich; On-site; GBP 30,000 - 40,000; Full time

Job summary

Sizewell C Limited is seeking a Cost Assurance Assistant to join the Civil Works Alliance (CWA) team. You will help protect the project budget and cash flow by supporting the Independent Cost Verifier, reviewing costs, and ensuring records align with contract rules.

Working with seasoned finance professionals on a large-scale nuclear construction, you will gain experience in cost reporting, forecasting, financial controls, and business partnering for delivery on time and within budget.

Qualifications

• Degree in Finance or related field.
• Basic experience in cost control, auditing within construction or engineering.
• Strong skills in Microsoft Excel and cost management software.
• High accuracy in handling numbers, contracts, and financial records.
• Clear verbal and written communication to discuss costs.
• Nuclear background on regulated infrastructure projects.
• Familiarity with NEC or FIDIC construction contracts.
• Experience with SAP or specialized cost-tracking databases.

Responsibilities

• Audit Support: Help gather financial documents and data for internal and external cost audits.
• Reporting: Prepare follow up dashboards, charts, and summaries of variances for the IP’s and CWA Commercial and Finance Team.
• Compliance: Ensure all financial and procurement actions follow internal procedures.

Skills

Cost control

Auditing

Data literacy

Attention to detail

Communication

Nuclear background

Contract knowledge

Advanced tools

Education

Finance degree or related field

Tools

SAP

Cost-tracking databases

Job description

Cost Assurance Assistant 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 theCWA Wide Section.

What will you do?

The Cost Assurance Assistant helps protect the project budget and cash flow. He will support the Independent Cost Verifier team who will review costs, check invoices, and make sure all financial records match contract rules. This work supports safe, on-time, and within-budget delivery of complex nuclear building tasks.

The successful candidate will gain practical experience in project financial management, cost reporting, forecasting, financial controls, auditing, and business partnering. Working alongside experienced finance professionals, the role will provide exposure to a large-scale construction projects and the financial disciplines required to deliver them successfully.

Key responsibilities:

• Audit Support : Help gather financial documents and data for internal and external cost audits.
• Reporting : Prepare follow up dashboards, charts, and summaries of variances for the IP’s and CWA Commercial and Finance Team.
• Compliance : Ensure all financial and procurement actions follow internal procedures.

What are we looking for?

• Education: A degree in Finance, or a related field.
• Experience: Basic experience in cost control, auditing within construction or engineering.
• Data Literacy: Strong skills in Microsoft Excel and cost management software.
• Attention to Detail: High accuracy in handling numbers, contracts, and financial records.
• Communication: Clear verbal and written skills to discuss costs with ICV teams.
• Nuclear Background: Prior work on nuclear or highly regulated infrastructure projects.
• Contract Knowledge: Familiarity with standard construction contracts like NEC or FIDIC.
• Advanced Tools: Experience with SAP or specialized cost-tracking databases.

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.