Construction Assurance Engineer

We have an exciting opportunity for you to significantly impact the development and modernisation of our Sewage Treatment Works in London and the surrounding areas.

If you’re passionate about improving essential services and protecting the environment, this role puts you right at the heart of it. As our Construction Assurance Engineer, you’ll help shape the future of wastewater infrastructure—ensuring our Sewage Treatment Plants continue to operate safely, reliably and sustainably for the communities who depend on us every day.

You’ll join a supportive, purpose‑driven team dedicated to delivering vital services while safeguarding the environment for generations to come.

What you’ll be doing as a Construction Assurance Engineer

• Supporting design and delivery reviews, identifying construction‑phase risks and issues, and working collaboratively with stakeholders to drive effective resolution.
• Carrying out health and safety audits to ensure safe working practices and corrective actions are completed promptly.
• Taking the lead during construction phases of wastewater projects—monitoring progress, reporting performance, addressing issues early, and driving escalation where required.
• Ensuring all non‑conformances are identified, recorded and resolved to the required standard.
• Managing and closing out snags, liaising with Operators and contractors post‑takeover to support defects, aftercare and performance testing.
• Monitoring, agreeing and approving Takeover tests alongside the project team.
• Ensuring all project documentation meets specification and that takeover information is complete, accurate and approved.
• Working as an active, collaborative member of one or more project teams, engaging closely with contractors to ensure safe and successful project outcomes.

Location – Hybrid – Maple Lodge with site visits required in London and the surrounding areas

This role requires regular on‑site presence to support inspections, reviews and construction assurance activities.

36 hours per week, Monday to Friday.

A full driving licence and access to your own vehicle are essential.

This role includes a £4,500 car allowance.

What you should bring to the role

• An HNC or above in a relevant engineering discipline, or equivalent experience in a similar construction or engineering role.
• Knowledge of health and safety on construction sites. If you do not currently hold an SMSTS qualification, we can support you in achieving it.
• Understanding of design, construction and operational principles—ideally within the wastewater industry or similar environments.
• Background in project delivery, site assurance, or integration within the construction sector.
• Strong communication skills with the confidence to engage with stakeholders at all levels, from site teams to project managers.

What’s in it for you?

• Competitive salary from £40,000 to £60,000 per annum.
• Car allowance of £4,500 a year.
• 26 days holiday per year, increasing to 30 with the length of service. (Plus bank holidays)
• Contributory pension – Defined Contribution – Maximum of 12% -2x employee contribution.
• Personal Medical Assessments – Open to all once a year.
• Wider benefits scheme, including our benefits hub, which is packed full of 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.