Civils Site Supervisor

Civils Site Supervisor – HV Substation (Walpole, PE14 7JE
)

Location:

Walpole 400kV Substation, Norfolk
Rate:
Competitive day rate (Outside IR35)
Contract Type:
Full-time, site-based, contract
Duration: 2-year project | Initial 6-month rolling contract | Start:
January 2026

Hours:

Monday to Friday, 50 hours per week
IR35 Status:
Outside IR35

MRR Infrastructure is partnering with a leading global engineering and construction consultancy delivering high-profile transmission and distribution infrastructure projects across the UK. With an excellent track record on National Grid frameworks, our client is known for its safety-led culture and focus on delivering quality outcomes on complex substation schemes.

We are seeking an experienced Civils Site Supervisor to join the delivery team at Walpole 400kV Substation. This is a long-term opportunity for a motivated and capable individual with a strong background in civil supervision on National Grid substation sites.

You will be responsible for managing day-to-day site operations, ensuring work is carried out safely, to programme and in accordance with quality and compliance standards. Supporting the Site Manager, you will oversee subcontractor performance, coordinate works, assist in delivering project documentation and play a key role in upholding best practice across health, safety and environmental management.

Essential Responsibilities:

You will supervise the delivery of civil works, ensuring CDM compliance, issuing permits, setting operatives to work, monitoring progress and performance, and ensuring daily site activities align with project timelines and quality expectations. You'll lead by example, promote safe working practices, and be a key point of contact for subcontractors and the wider delivery team. Timely reporting and support in the production of as-built drawings and other project records will also form part of your duties.

Essential Qualifications &

Experience:

* CSCS Supervisor Card

* SSSTS or SMSTS

* National Grid Person

* National Grid Competent Person (NSI 6 &
8)

* HSG
47

* Full UK driving licence

* Minimum 5 years’ experience in civil site supervision on National Grid substation projects

* Demonstrable knowledge of CDM Regulations and HSQE best practice

* Strong reporting, coordination and site communication skills

Desirable:

* CITB Temporary Works Supervisor or Coordinator

* IOSH Environmental or equivalent

* Impressed Voltage awareness training

* First Aid (3-day course)

* Formal training in construction site safety or engineering principles

This is a site-based role requiring regular attendance at the Walpole 400kV Substation. Candidates must be able to manage their own travel and accommodation if necessary