Commercial Manager

Unify; Sizewell; On-site; GBP 74,000 - 97,000; Full time

Benefits offered by this job

Company vehicle

Car allowance £7,000

22 days leave + bank holidays

8% pension contribution

Life assurance

Health cash plan

Wellbeing support

Retail & lifestyle discounts

Career development pathways

Job summary

Unify is recruiting a Commercial Manager for the Sizewell C major infrastructure programme. The role focuses on NEC‑driven commercial leadership across multi‑package workstreams, including three wastewater treatment plant design and build projects, reporting, change management and governance with stakeholders.

You will manage NEC contract administration, subcontracts, and ensure alignment between cost and value while supporting strategic decision‑making for the programme.

Qualifications

• NEC contract experience (NEC3/NEC4) required.
• Background in water, utilities or infrastructure projects.
• Experience managing contracts governed by Primavera P6.
• Strong commercial reporting, forecasting and change management capability.
• Ability to lead commercial governance across complex, multi‑stakeholder programmes.
• SC clearance is ideal but not essential – sponsorship available.

Responsibilities

• Lead commercial management across Sizewell C work packages, including three wastewater treatment plant design & build projects.
• Manage NEC contract administration, change control, compensation events and risk.
• Oversee subcontract procurement, negotiation and commercial performance.
• Produce accurate CVRs, forecasts, cashflow and commercial reports.
• Work closely with project delivery teams to ensure cost and value alignment.
• Maintain strong client and supply chain relationships.
• Ensure compliance with internal governance and external contractual obligations.
• Support strategic commercial decision‑making across the programme.

Skills

NEC contract experience (NEC3/NEC4)

Water/infrastructure projects

Forecasting

Change management

Commercial governance

Stakeholder management

Tools

Primavera P6

Job description

Commercial Manager – Major Infrastructure (Sizewell C)

Permanent | £85,000 + Company Vehicle or £7,000 Car Allowance

The Opportunity

A leading UK civil engineering and infrastructure contractor is looking to appoint a Commercial Manager to support long‑term delivery on Sizewell C, including the design and build of three new wastewater treatment plants forming part of the site’s critical utilities infrastructure. This is a permanent role offering stability, progression and the chance to work on a nationally significant project with decades of future work.

The contractor is expanding its commercial leadership team and is seeking someone with strong infrastructure, utilities or water sector experience who can operate confidently within NEC‑governed environments.

Key Requirements

• MUST have NEC contract experience (NEC3 or NEC4)
• Background in water, utilities or infrastructure projects
• Experience managing contracts governed by Primavera P6
• Strong commercial reporting, forecasting and change management capability
• Ability to lead commercial governance across complex, multi‑stakeholder programmes
• SC clearance is ideal, but not essential – the contractor can sponsor this

Role Responsibilities

• Lead commercial management across Sizewell C work packages, including three wastewater treatment plant design & build projects
• Manage NEC contract administration, change control, compensation events and risk
• Oversee subcontract procurement, negotiation and commercial performance
• Produce accurate CVRs, forecasts, cashflow and commercial reports
• Work closely with project delivery teams to ensure cost and value alignment
• Maintain strong client and supply chain relationships
• Ensure compliance with internal governance and external contractual obligations
• Support strategic commercial decision‑making across the programme

Package & Benefits

• £85,000 base salary
• Company vehicle or £7,000 car allowance
• 22 days annual leave + bank holidays
• 8% pension contribution
• Life assurance
• Health cash plan
• Employee wellbeing support
• Retail & lifestyle discounts
• Clear career development pathways

Ideal Candidate Profile

You’ll be a commercially astute professional with a track record in NEC‑driven environments, ideally within utilities, water or major infrastructure. You’ll bring strong contractual knowledge, excellent stakeholder management and the confidence to lead commercial outcomes on a high‑profile project