Assistant Site Manager (Outside IR35)
? Location: Isle of Grain
? Duration: January 2026 – January 2027
?? Sector: Energy / HVDC / Heavy Civils
???? Recruiter: Spencer Ogden – Power & Infrastructure
About the Role
Spencer Ogden are currently seeking an Assistant Site Manager (General Site Manager) to support the delivery of a major energy infrastructure project in the South East.
This is an excellent opportunity for an experienced site professional with a strong background in heavy civils and infrastructure to work on a high-profile development within the UK’s growing energy sector. You will support the Senior Site Manager and Project Manager in coordinating multiple subcontractors and ensuring all site activities are delivered safely, on time, and to the highest standards.
Key Responsibilities
Support the Senior Site Manager and Project Manager with day-to-day site coordination.
Lead and manage multiple subcontractors and work teams across various work fronts.
Ensure all work is completed safely, efficiently, and in compliance with quality standards.
Work in line with Siemens Energy QEHS procedures and site rules.
Identify and report potential schedule deviations and coordinate corrective actions.
Promote a proactive health, safety, and environmental culture on site.
Support documentation, reporting, and delivery of project milestones.
Experience & Background
Proven experience in heavy civils within construction, energy, or infrastructure projects.
Background as a Construction Manager, Site Manager, General Foreman, or Works Superintendent.
Experience within substation or HVDC environments advantageous.
Comfortable managing subcontractors, teams, and SSOWs.
Familiarity with mechanical and electrical installation works preferred.
Required Qualifications
SMSTS
CSCS Card
IOSH Managing Safely
HSG47
First Aid (Desirable)
CCNSG Safety Passport, Manual Handling, Working at Height, Fire Safety Awareness
Client-specific authorisations (SSE / Scottish Power / National Grid BESC, NSI6 / NSI8) beneficial.
Personal Attributes
Strong leadership and interpersonal skills.
Proactive, safety-focused mindset with excellent problem-solving ability.
Confident IT user (Word, Excel, etc.).
Positive attitude towards teamwork and conflict resolution.
Ability to motivate and maintain productive relationships on site.
Please complete the form for this job application.
At Spencer Ogden, we are dedicated to promoting diversity, equity and inclusion throughout our recruitment process. We encourage applicants from all backgrounds and are committed to making any necessary adjustments to ensure you can present your best self. If you require additional time for assessments, alternative application methods, or access to interview questions in advance, please let us know. We are open to any requests or suggestions and continually seek innovative ways to assess talent. As global recruitment experts in sustainability, natural resources and infrastructure we are working with our clients and candidates to create careers to power a sustainable future. Our priority is to ensure you feel supported, respected, and secure throughout your experience with us. #LifeAtSO