Assistant Project Manager

As an Assistant Project Manager, you’ll take ownership of delivering projects or programmes of work within your geographical area, acting as the central point of accountability and leadership. You’ll ensure contractors deliver safely, on time, within budget and to the highest quality standards.

You’ll also play a key role in continuously developing both the project team and supply chain—driving improvements in safety, customer satisfaction and commercial performance.

What you’ll be doing as an Assistant Project Manager

• Deliver sustainable financial out‑performance against approved budgets through effective project and commercial management.
• Manage all contract matters to secure the best possible outcomes for Thames Water.
• Develop and deliver optimised project plans that meet all regulatory, statutory and internal targets.
• Deliver technical solutions that offer maximum value for money on both capital and whole‑life costs.
• Drive high performance from service providers, ensuring strong service levels and excellent value for money.
• Proactively manage project risks to reduce financial and delivery impacts.
• Administer contract changes and ensure clear and compliant contract management throughout.
• Ensure full compliance with quality systems so all results meet required standards.
• Build and maintain strong external stakeholder relationships, enhancing Thames Water’s reputation in the community.
• Lead and develop your team, fostering a culture of accountability, ambition and achievement.
• Champion innovation, leveraging ideas from the supply chain to create a culture of continuous improvement.
• Promote a proactive health, safety & environmental culture across your project and suppliers.
• Achieve best practice in safe, sustainable project delivery, from construction through to ongoing operation and maintenance.

This role is a Hybrid role based at Maple Lodge, London, you will be expected on site 3 days a week.

What you should bring to the role

• HNC or higher in a relevant subject or significant experience in a similar role.
• Strong contractual awareness and understanding of Project Management principles.
• A proven track record of managing third‑party performance and delivering capital projects.
• Solid industry knowledge and commercial awareness.
• Financial capability to manage P&L, revenue expenditure and cash flow to meet financial targets.
• A balanced commercial approach—able to support business growth while maintaining cost efficiency.
• Proven experience in process improvement and implementation.
• Strong customer service ethic with measurable examples of improving satisfaction for both internal and external customers.

What’s in it for you?

• Offering between £42,000 to £48,000 per annum, depending on experience and skills.
• Car Allowance of £4,500 per annum.
• Base location of Crossness STW, East London.
• Contributory pension – Defined Contribution - Maximum of 12% -2x employee contribution.
• Personal Medical Assessments – Open to all once a year.
• A wider benefits scheme, including our benefits hub, is packed with offers and information to save you money and support your well-being.

Find out more about our benefits and perks

Who are we?
We’re the UK’s largest water and wastewater company, with more than 16 million customers relying on us every day to supply water for their taps and toilets. We want to build a better future for all, helping our customers, communities, people, and the planet to thrive. It’s a big job and we’ve got a long way to go, so we need help from passionate and skilled people, committed to making a difference and getting us to where we want to be in the years and decades to come.

Learn more about our purpose and values

Working at Thames Water
Thames Water is a unique, rewarding, and diverse place to work, where every day you can make a difference, yet no day is the same. As part of our family, you’ll enjoy meaningful career opportunities, flexible working arrangements and excellent benefits.
If you’re looking for a sustainable and successful career where you can make a daily difference to millions of people’s lives while helping to protect the world of water for future generations, we’ll be here to support you every step of the way. Together, we can build a better future for our customers, our region, and our planet.

Real purpose, real support, real opportunities. Come and join the Thames Water family. Why choose us? Learn more.

We’re committed to being a great, diverse, and inclusive place to work. We welcome applications from everyone and want to ensure you feel supported throughout the recruitment process. If you need any adjustments, whether that’s extra time, accessible formats, or anything else just let us know, we’re here to help and support.

When a crisis happens, we all rally around to support our customers. As part of Team Thames, you’ll have the opportunity to sign up to support our customers on the frontline as an ambassador. Full training will be given for what is undoubtedly an incredibly rewarding experience. It’s also a great opportunity to learn more about our business and meet colleagues.

Disclaimer: due to the high volume of applications we receive, we may close the advert earlier than the advertised date, so we encourage you to apply as soon as possible to avoid disappointment.