Sub Agent - Civils​/Tunnelling

Position: Sub Agent - Civils / Tunnelling
Sub Agent - Civils/Tunnels | Snowdonia National Park
£55,000 - £65,000 (Negotiable, DOE) + Package | Permanent

Location:

Snowdonia National Park (Eryri), North Wales

About the Role

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 - significantly enhancing the visual and environmental quality of this iconic landscape.

You will play a key role in the day-to-day delivery of the civils and tunnelling works, supporting the Project Manager and wider site team to ensure the scheme is delivered safely, on programme, and to the highest quality standards.

The Project Scope Includes:

A 3.4km tunnel, 3.5m 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

Key Responsibilities

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 escalate 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

About You

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 (e.g., 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 What's on Offer

£55,000 - £65,000 basic salary, negotiable dependent 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

Interested?

If you're a driven Sub Agent with a background in civils and tunnelling, looking to make a visible, lasting impact on the UK's landscape and infrastructure, apply now to be part of this prestigious scheme