Associate Project Director - TOC Assurance Tunnelling in Leiston

Mace combines construction expertise with consultancy to unlock potential in every person or project and redefine the boundaries of ambition.

Our values shape the way we consult and define the people we want to join us on our journey.

The Project

Are you looking for a career which is rewarding, at the cutting edge of project development and where you can really make a difference?

Come and join our expanding Sizewell C (SZC) team and work on one of the most exciting and largest megaprojects in the UK, whilst being at the forefront of the UK’s climate change agenda and energy policy.

Sizewell C (SZC) will be a 3.2‑gigawatt power station generating low‑carbon electricity for around 6 million homes, playing a key role in our energy future, supplying reliable, clean electricity for at least 60 years.

The Project Manager (PM) - TOC Assurance, Tunnelling will support the assurance of Target Outturn Cost (TOC) submissions for tunnelling and underground works at Sizewell C.

This role focuses on reviewing cost and methodology alignment for complex underground construction, ensuring submissions reflect realistic delivery approaches and appropriate risk allowances.

• You’ll Be Responsible For
• TOC Assurance - Tunnelling.
• Reviewing TOC submissions for tunnelling works (TBM, shafts, SCL, underground structures).
• Assessing cost build‑ups in relation to construction methodologies.
• Challenging assumptions on productivity, sequencing, and logistics.
• Evaluating risk allowances specific to underground works procurement and contractor engagement.
• Supporting procurement activities for tunnelling packages.
• Reviewing tender submissions and commercial proposals.
• Assisting in contractor engagement and clarification processes.
• Ensuring alignment between design, methodology, and cost.
• Commercial and Risk Review.
• Analyzing cost drivers unique to tunnelling environments.
• Identifying commercial risks and opportunities.
• Supporting benchmarking and assurance processes, stakeholder and interface management.
• Working closely with engineering, design, and commercial teams.
• Supporting technical and commercial assurance workshops.
• Providing structured reporting and recommendations for financial matters (e. g., investments, funding, budget or programme costs).
• General understanding of the Capital Programme budget forecasting along with transition of programme elements back to influence of the costs and budgets risk (for example Capital, Project or Performance risks).
• General understanding of the capital projects and related risk identification, quantification and analysis.
• General understanding of Quantitative Risk Analysis including Monte Carlo simulation for QSRA and QCRA.
• You’ll Need To Have
• Minimum 12+ years’ experience in infrastructure, including tunnelling.
• Background in quantity surveying/commercial or engineering with cost exposure.
• Experience within contractor or specialist tunnelling environments.
• Exposure to complex underground construction projects.
• Understanding of TBM operations, shaft construction, ground risk and geotechnical considerations.
• Ability to link construction methodology to cost.
• Strong analytical and problem‑solving capability.
• Ability to challenge assumptions constructively.
• Clear communication and reporting skills.
• Degree in Civil Engineering, Quantity Surveying, or related discipline.
• Relevant professional membership desirable.
• Humility.
• Recognise the value brought from different cultures and experiences.
• Be open to others’ points of view and ideas, be willing to debate and to compromise.

Our Values

Safety first – Going home safe and well

We champion a safe, diverse and inclusive working environment, understanding the importance of wellbeing in every team.

Client focus – Deliver on our promise

We own the quality of deliverables, strategic outcomes and build long‑term relationships with our clients.

Integrity – Always do the right thing

We influence positive outcomes within our industry, while always aligning with our compliance obligations.

Create opportunity – For our people to excel

We champion a continuous improvement culture throughout all activities, inspiring our people and teams to develop.

Mace is an inclusive employer and welcomes interest from a diverse range of candidates.

Even if you feel you do not fulfil all the criteria, please apply as you may still be the best candidate for this role or another role within our organisation.

We are also open to discussing part time, flexible, and hybrid working options if suitable within the role.

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