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Posted 11 August, 2026

Mechanical Supervisor

Kier Group
Kelshall, Hertfordshire, United Kingdom Full Time
Reference: 8cb78527-167a-4607-a1d0-811b42f5285d

Are you ready to take your career to the next level? We’re on the lookout for a Mechanical Site Supervisor to join our dynamic Thames Water East Hyde Project team, based in Harpenden STW, Hertfordshire.

Job Details

Location: Harpenden STW, Hertfordshire
Hours: 45 hours per week - some flexibility on hours may be available, just let us know when you speak to us.

Please note: We are unable to offer certificates of sponsorship for this role.

Your Role

As a Mechanical Site Supervisor, you will play a crucial role in supervising and controlling all mechanical site activities, ensuring that we meet Kier's health and safety standards at all times. You’ll be part of our strategic partnership with Thames Water, delivering top-notch design and build services for both new and existing infrastructure assets.

What Will You Be Responsible For?

In this role, you will support the Thames Water East Hyde Project team in delivering safe and compliant mechanical installations. Your daily tasks will include:

  • Assisting the Site Manager in maintaining a safe working environment for all employees, supply chain partners, and visitors.
  • Supervising work to ensure compliance with Method Statements and Work Instructions.
  • Reviewing and signing off project ITPs, ensuring they are managed through Kier's common data environment.
  • Overseeing mechanical contractor testing and ensuring alignment with Thames Water's asset standards.
  • Collaborating with the supply chain on-site to troubleshoot and support the development of commissioning documentation.

What Are We Looking For?

This role is perfect for you if:

  • You possess a Full driving licence and have proven industry experience in the Water Industry.
  • You hold an NVQ/BTEC Level 3 in Mechanical installations and a relevant CSCS Card.
  • You have SSSTS/SMSTS and Confined Spaces qualifications.
  • You have a solid understanding of sewage and water treatment processes, systems, and typical M&E plant/equipment.
  • You demonstrate competent judgement and problem-solving skills, with an understanding of Mechanical Test Regimes.

At Kier, we believe in recognizing potential. If you don’t meet every single requirement, don’t hesitate to apply—we’d love to chat!

Rewards and Benefits

We’re proud to offer our amazing team a wide variety of benefits that you can tailor to fit your needs. Explore the opportunities that await you!

Diversity and Inclusion

Creating a diverse and inclusive workplace is a top priority for us. We’re proud of the progress we’ve made, but we know there’s always more to do. Our employees play a vital role in shaping Kier's diversity and inclusion initiatives, and their experiences help us refine our policies. As a Disability Confident employer, we ensure that a fair number of disabled applicants who meet the minimum criteria for this role will be offered an interview.

We can’t wait to see your application! Join us at Kier and be part of something great. #joinkier #LI-CH1

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