Assistant Cost Manager

Talented people are the key to our success. Would you like to join an inclusive and collaborative organisation, recognised as one of the UK’s most successful infrastructure businesses? We are seeking an ambitious Assistant Cost Manager to join our team on the National Grid Great Grid Partnership (GGP) framework. This is a high‑profile, nationally significant energy infrastructure programme, playing a vital role in strengthening and future‑proofing the UK’s electricity network. This role offers an excellent opportunity to support the delivery of a diverse portfolio of high‑profile schemes within a supportive, high‑performing environment that encourages professional development and career progression. You will contribute to one of the UK’s most important energy upgrades, helping to shape a resilient and future‑ready network.

Role Responsibilities

• Proven ability to provide effective administrative support within a commercial or finance team.
• Experience ensuring accurate cost coding across plant and material requisitions and purchase orders.
• Competent in generating and maintaining system accruals for material deliveries and plant hire.
• Ability to process and complete timesheets for weekly paid resources accurately and to deadlines.
• Experience performing general accounts administration duties, including data entry and record management.
• Confident user of finance and accounts systems, with a sound understanding of purchase ledger processes.
• Ability to support the production of key financial reports, ensuring accuracy and timeliness.

Skills, Experience and Qualifications

• Experience using finance or accounts systems, with a solid understanding of purchase ledger processes.
• Experience with COINS, or similar construction or commercial management systems.
• Strong Microsoft Office skills, particularly Excel.
• Excellent planning, organisation, and time‑management skills, with the ability to manage competing priorities.
• Ability to work effectively both independently and as part of a team.
• Confident contributing across multiple projects, sites, or operational areas.
• Strong written communication, with well‑developed analytical and problem‑solving skills.
• High attention to detail, with a commitment to maintaining standards and meeting specifications.
• Proven ability to collaborate with colleagues to support project delivery and operational performance.

What is in it for you?

• 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.

About the Energy Business Unit

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.