Mission freelance Site Supervisors - Civil/Electrical - 400kV

A global construction client of ours are looking for two different Site Supervisors - a Civil Site Supervisor and an Electrical Site Supervisor - for two different 400kV substation projects in the Norfolk area.

These would be 6-month rolling contracts starting ASAP, with the projects lasting around 2 years.

Electrical Site Supervisor - Key Responsibilities:

• Supervise all electrical installation works across the 400kV substation project, including HV equipment, switchgear, transformers, protection & control systems, and cabling.
• Oversee subcontractor performance, ensuring compliance with project specifications, drawings, and national electrical standards.
• Ensure all works are executed in accordance with safety rules (including Permit‑to‑Work, LOTO procedures, and HV safety protocols).
• Conduct daily briefings, toolbox talks, and progress reporting to the Site/Construction Manager.
• Review and sign off ITPs, quality documentation, test results, and red‑line mark‑ups.
• Coordinate with commissioning teams to ensure smooth energisation phases.
• Monitor progress, manage site issues, and drive timely completion of electrical work packages.

Requirements:

• Proven experience supervising electrical works on HV substations (132kV-400kV).
• National Grid Person and/or Competent Person
• Strong understanding of electrical substation equipment installation and commissioning workflows.
• Experience managing subcontractors on complex infrastructure projects.
• Valid CSCS / EUSR / SHEA Power (or equivalent).
• SSSTS/SMSTS
• Strong focus on safety, quality, and documentation.

• Supervise all civil engineering activities, including earthworks, foundations, piling, ducting, drainage, control building works, bunding, access roads, and structural installations.
• Ensure civil works meet design specifications, technical standards, and client requirements.
• Lead site teams and subcontractors, ensuring safe and productive execution of daily tasks.
• Conduct site inspections, issue NCRs where required, and maintain strict QA compliance.
• Interface with electrical teams to coordinate sequencing of civil-to-electrical handovers.
• Manage materials, logistics, temporary works, permits, and method statement compliance.
• Produce daily/weekly progress updates for the construction management team.

Requirements:

• Proven experience supervising civil works on HV substations (132kV-400kV).
• NG Person and/or Competent Person
• SSSTS/SMSTS
• Knowledge of reinforced concrete structures, HV equipment foundations, and substation layout requirements.
• Strong understanding of CDM Regulations and site safety requirements.
• Valid CSCS (Supervisor/Manager level).
• Ability to read engineering drawings and manage strict QA processes.

Please click to find out more about our Key Information Documents. Please note that the documents provided contain generic information. If we are successful in finding you an assignment, you will receive a Key Information Document which will be specific to the vendor set-up you have chosen and your placement.

To find out more about Progressive please visit

Progressive Recruitment, a trading division of SThree Partnership LLP is acting as an Employment Business in relation to this vacancy | Registered office | 8 Bishopsgate, London, EC2N 4BQ, United Kingdom | Partnership Number | OC387148 England and Wales