Sub Agent - Civils​/Tunnelling

Sub Agent – Civils/Tunnels (Snowdonia National Park)

Location:

Snowdonia National Park (Eryri), North Wales

Salary: £55,000 - £65,000 (Negotiable, DOE) + Package | Permanent

Overview

An exciting opportunity has arisen for an experienced Sub Agent to join a major civils and tunnelling infrastructure scheme delivered on behalf of National Grid, based within the stunning Eryri National Park. The project involves constructing a new cable tunnel beneath the estuary near Portmeirion, enabling the removal of 10 pylons and 3.4km of overhead line, and replacing them with 400kV cables routed through a tunnel deep underground.

• 3.4 km tunnel, 3.5 m in diameter, connecting two new shafts
• Construction of two new head houses, one at each shaft
• A new sealing end compound, plus reconfiguration and extension of an existing sealing end compound
• Installation of two high voltage (HV) electrical circuits
• Circuit connections between the reconfigured and new sealing end compounds

• Supervise and manage day-to-day civils and tunnelling operations on site
• Support shaft sinking, tunnel excavation, lining, and headhouse construction activities
• Manage subcontractors, plant, and labour resources to ensure efficient delivery
• Ensure works are carried out in accordance with drawings, specifications, and method statements
• Monitor progress against programme and elevate risks or delays to the Project Manager
• Maintain strict compliance with health & safety, quality, and environmental standards, particularly given the National Park setting
• Assist with technical queries, setting out, and quality control/inspection processes
• Liaise with engineers, designers, and site management to resolve construction issues

• Proven experience as a Sub Agent or Senior Engineer within civils and/or tunnelling projects
• Experience with shaft construction, tunnelling, or underground infrastructure highly desirable
• Strong understanding of temporary works, groundworks, and heavy civils construction methods
• Excellent people management skills, with experience supervising subcontractors and site teams
• Relevant qualifications (Civil Engineering degree/HNC/HND, SMSTS, CSCS) essential
• Strong health & safety focus and commitment to environmental best practice
• Full UK driving licence, with flexibility to be based on-site in Snowdonia

• £55,000 - £65,000 basic salary, negotiable based on experience
• Lodging provided
• Attractive benefits package
• Opportunity to work on a landmark national infrastructure project
• Based in one of the UK's most beautiful National Parks
• Long-term career development within a high-profile scheme