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Posted 17 August, 2026

Mechanical Supervisor

Kier Group
Harpenden, HERTFORDSHIRE, United Kingdom Full Time
Reference: 8defe186-0f32-4e38-825f-40e734a4404d

Join Our Team as a Mechanical Site Supervisor!

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.

Location & Hours

Location: Harpenden STW, Hertfordshire
Hours: 45 hours per week (some flexibility available—just let us know when we chat!)

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. Your mission? To ensure compliance with Kier’s health and safety standards while working as part of our strategic partnership with Thames Water, delivering top-notch design and build services for both new and existing infrastructure assets.

Key Responsibilities

In this exciting role, you will:

  • Support the Site Manager in maintaining a safe working environment for all employees, supply chain partners, and visitors.
  • Supervise work to ensure it aligns with Method Statements and Work Instructions.
  • Review and sign off project ITPs, managing them through Kier’s common data environment.
  • Oversee mechanical contractor testing, ensuring compliance with Thames Water’s asset standards.
  • Collaborate with the supply chain on-site to troubleshoot and support the development of commissioning documentation.

What We’re Looking For

This role is perfect for you if you:

  • Hold a full driving license and have proven experience in the Water Industry.
  • Possess an NVQ/BTEC Level 3 in Mechanical installations and a relevant CSCS Card.
  • Have SSSTS/SMSTS and Confined Spaces qualifications.
  • Bring a solid understanding of sewage and water treatment processes, systems, and typical M&E plant/equipment.
  • Exhibit strong judgment and problem-solving skills, along with knowledge of Mechanical Test Regimes.

At Kier, we believe in finding potential, so even if you don’t meet every single requirement, we encourage you to apply and let’s have a conversation!

Rewards and Benefits

We’re proud to offer our amazing team a variety of benefits tailored to your needs. Explore the options that work best for you!

Diversity and Inclusion

Creating a diverse and inclusive workplace is a top priority for us at Kier. We’re committed to continuous improvement and value the contributions of our employees in shaping our diversity and inclusion initiatives. As a Disability Confident employer, we ensure that a fair number of disabled applicants meeting the minimum criteria for this role will be invited for an interview.

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

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