Overview
The Commercial Administrator supports the commercial team with day-to-day administration, documentation, reporting, and coordination. The role is central to maintaining robust audit trails, ensuring governance compliance, and enabling senior commercial staff to focus on strategy, forecasting, and client engagement.
What This Role Delivers
* A consistent, reliable commercial governance backbone.
* Improved efficiency across the commercial team.
* High-quality documentation and reporting that supports confident decision-making.
* Strong audit trails and compliance with internal and client requirements.
Responsibilities
* Maintaining commercial trackers, change logs, and forecasting inputs to ensure accurate, up-to-date reporting.
* Managing document control for commercial correspondence, approvals, contracts, and subcontract documentation.
* Supporting procurement activities through issuing enquiries, logging returns, and preparing comparison schedules under guidance.
* Preparing meeting packs, dashboards, and commercial reports for internal reviews.
* Ensuring all commercial records are audit-ready, well-structured, and compliant with governance expectations (Costain Way).
* Assisting with cost capture, timesheet collation, accrual inputs, and basic cost reporting.
* Coordinating signatures, approvals, and workflow management across the commercial function.
* Supporting the administration of early warnings, compensation events, and risk registers.
* Acting as a central point of coordination between commercial, project management, finance, and supply chain teams.
Knowledge, Skills, Behaviours and Experience
Skills & Experience
* Strong organisational skills with excellent attention to detail.
* Confident using Excel, document management systems, and commercial reporting tools.
* Experience in construction, infrastructure, or a similar project-based environment is beneficial.
* Ability to manage multiple deadlines and maintain accuracy under pressure.
* Clear communicator who can work collaboratively across disciplines.
* Proactive, reliable, and comfortable taking ownership of administrative processes.
Qualifications
Essential
* English and Maths GCSE Level 5 or equivalent
Desirable
* Business Administration NVQ level 3 or equivalent
About Us
Costain helps to improve people’s lives with integrated, leading edge, smart infrastructure solutions across the UK’s energy, water, transportation and defence markets. We help our clients improve their business performance by increasing capacity, improving customer service, safeguarding security, enhancing resilience, decarbonising and delivering increased efficiency. Our vision is to be the UK’s leading smart infrastructure solutions company. We will achieve this by focusing on blue chip clients whose major spending plans are underpinned by strategic national needs, regulatory commitments, legislation or essential performance requirements. We offer our clients leading edge solutions that are digitally optimised through the following five services which cover the whole lifecycle of their assets: future-shaping strategic consultancy; consultancy and advisory; digital technology solutions; asset optimisation and complex programme delivery. Our culture and values underpin everything we do.
Costain appreciate the time and effort taken when applying for one of our positions but, due to the high volume of responses, we are unable to provide individual feedback on candidates at application phase.
We do share individual feedback following an interview.
A Disability Confident employer will generally offer an interview to any applicant that disclose they have a disability and meets the minimum criteria for the job as defined by the employer.
It is important to note that in certain recruitment situations such as high-volume, seasonal and high-peak times, the employer may wish to limit the overall numbers of interviews offered to both disabled people and non-disabled people.
For more details please go to the Disability Confident website:
https://www.gov.uk/government/collections/disability-confident-campaign
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