Site Manager SR163 (Morgan Sindall)

Position: Site Manager SR163

Employer: Morgan Sindall Group (Morgan Sindall Infrastructure)

Reference ID: REQN0001224

Work Arrangement: ONSITE

Posted Date: 13/07/2026

Morgan Sindall Infrastructure delivers high-quality complex civil engineering and infrastructure projects across the UK. With frameworks and major schemes spanning nuclear decommissioning at Sellafield, National Grid energy transmission networks, major highways enhancements for National Highways, and high-speed rail programmes, Morgan Sindall provides an environment of innovation, engineering excellence, and long-term career development.

Trawsfynydd, North Wales

Talented people are the key to our success.

We are looking for a motivated and experienced SR163 Site Manager to join our team on the GGP (Great Grid Upgrade) Framework, supporting the delivery of the PTNO/PTC1 (Pentir to Trawsfynydd) Project in North Wales.

This exciting project involves the modification of the existing National Grid substation at Trawsfynydd and forms part of a programme of works. As the project enters the delivery phase, we are seeking a skilled Site Manager to lead site operations through to project completion.

This is a fantastic opportunity to play a key role within a high-profile National Grid project in a rapidly growing sector, offering long-term career development and the opportunity to work on major UK infrastructure.

Reporting to the Project Manager, the successful candidate will be responsible for the safe, efficient, and compliant management of all site operations, ensuring works are delivered in accordance with National Grid standards and project requirements.

Leading and managing all day-to-day site operations within a live National Grid substation environment.

Acting as the primary interface between the project team and National Grid SAPs and operational personnel.

Ensuring full compliance with National Grid procedures, policies, and operational requirements.

Promoting and enforcing the highest standards of Health & Safety across site activities.

Managing environmental and quality requirements throughout project delivery.

Coordinating subcontractors, site teams, and project stakeholders to ensure effective programme delivery.

Monitoring construction progress and driving productivity to achieve project milestones.

Supporting the management of Mechanical and Electrical installation activities within the substation environment.

Contributing to commissioning preparation and interface activities where required.

Maintaining accurate site records, reporting progress, and escalating issues appropriately.

Supporting the successful delivery of the project.

Current SR163 Site Manager status with full NSI 6 & 8 competencies.

Proven experience working as a Site Manager within National Grid 400kV substations.

Experience operating in a Site Manager role on National Grid projects.

Strong working knowledge of National Grid operational procedures and requirements.

Experience managing construction activities within live EHV substation environments.

Mechanical and Electrical construction experience within power transmission or substation projects.

Good understanding of substation commissioning activities and associated interfaces.

Demonstrable experience managing Health & Safety, Environmental and Quality requirements on site.

Strong leadership, communication, and stakeholder management skills.

Ability to effectively coordinate multiple work fronts and contractors in a complex operational environment.

Experience delivering projects under National Grid framework contracts.

Knowledge of substation modification and upgrade projects.

Additional vocational or industry-recognised qualifications relevant to construction or electrical infrastructure delivery.

Below is a selection of benefits that are available to you at Morgan Sindall Infrastructure.

Generous holiday entitlement with the option to buy five days.

Flexible and adaptable working

Family friendly policies and work/life approach

Mentoring programmes and continuous learning support

Contributory pension scheme

Annual bonus scheme

Recognition scheme and long service awards

Car scheme and Private Medical Insurance (if applicable to role)

We also provide the option to participate in our share-save scheme; discounts including cycle to work and gym membership; a support and advice service for colleagues and their families, and more.

We have extensive experience in upgrading and replacing energy networks, delivering asset management for major UK energy companies and network operators.

Our transmission and distribution services involve the upgrading and replacement of electricity assets both above and below ground. Within the electricity sector we install and maintain assets, including excavation, laying, and jointing of cables, (fluid filled and XLPe), substations and overhead line, new build, repair, and refurbishment services.

We have an exciting opportunity for you to join our team where you will have the opportunity to progress in your career. We are looking for people who share our passion on delivering great customer service whilst also being able to work within an enjoyable and hardworking team environment. Talented people are the key to our success, so if this sounds like you, apply now.

Morgan Sindall is an equal opportunities employer and has been accredited with the Positive About Disabled People ‘Two Ticks’ accreditation. We are also an Investors in People company.

Morgan Sindall is unable to employ anyone who does not have the legal right to live and work in the UK.

Estimated Remuneration: GBP £45,000 - £65,000 per annum (competitive market rate commensurate with experience)

Direct Employer ATS Link: Apply directly via the official Morgan Sindall Recruitment Portal: [Site Manager SR163 on Morgan Sindall ATS](https://ce0970li.webitrent.com/ce0970li_webrecruitment/wrd/run/ETREC179GF.open?VACANCY_ID%3d079999DK9Z%26WVID%3d088970AYAH)