Cost Administrator

At John Sisk & Son, we’re more than a construction company – we’re a family‑owned business with a global reach, committed to building excellence in every project. We deliver trust, certainty, and value to our clients while embracing innovation and shaping the future of construction.

The Cost Administrator will carry out cost functions and administrative duties within the JSS Rail business.

Key Objectives

To be part of a cost management team, ensuring business costs are correct and invoices are paid on time.

• Monitor IT asset invoices and query suppliers and the Sisk accounts team in a timely manner.
• Chase credit notes, as necessary.
• Process goods received notes (GRNs) for plant & materials.
• Liaise with operation managers and commercial leads to confirm where costs need to be charged and verify cost accuracy.
• Input and maintain a subcontract register.

• Reconcile statements and carry out spot checks weekly for any fraudulent use.

• Liaise with departments to confirm tool requirements for new starters and contract renewals.
• Arrange repairs or replacement of broken tools.
• Track movement of plant between contracts.
• Monitor Hilti tools and ensure the system is up to date with asset locations, notifying Hilti of any lost items.
• Request write‑off costs for lost plant and order replacements, getting approval from operational and commercial leads.
• Maintain damage and loss register.
• Maintain the Hilti on‑track system with new starters and leavers.
• Develop and improve the Hilti on‑track system to include Sisk‑owned plant.
• Provide training on how to use the on‑track system to site teams and supervisors to ensure tool status is correct.
• Contact supervisors regularly to ensure a tool check is carried out and report any losses.

• Maintain review and approve all overhead invoices in a timely manner.

• Perform cost analysis and balancing.

• Process all weekly timesheets, liaise with HR and payroll, monitor sickness and holidays, and answer timesheet queries promptly.

• Understand the monthly overtime payroll procedure, cross‑check Geopal to recover monies owed from the client, and produce the monthly overtime spreadsheet for approval before sending to payroll.

• Monitor and process fines, ensuring full recovery of monies from employees.

• Other office duties and cost‑related tasks.

• Good telephone skills.
• Experience in administration.
• IT literate and competent in using software such as Excel, Word, and PowerPoint.
• Clear and effective communication skills.

• Can‑do attitude essential.
• Enthusiastic and self‑motivated.
• Ability to multitask.
• Proven team worker and able to work independently.

• At least 4 GCSE passes or equivalent, including English and Maths.
• Computer literate including Word, Excel, email, and internet.
• Good communication and telephone manner.
• Ability to use initiative.
• Discretion and confidentiality.
• Competitive salary.
• 26 days annual leave plus additional company days.
• Pension and benefits.
• Unlimited learning and development opportunities.

At Sisk Group, our people are at the heart of our success. We offer the chance to work with purpose, build a career with no limits, and be part of a great team.

All vacancies are managed directly by our Internal Recruitment Team. Unsolicited contact or speculative CVs from unapproved agencies will not be accepted and no introductory fees will apply.

We are an equal opportunities employer. We welcome applications from all qualified candidates regardless of gender, race, ethnicity, disability, age, sexual orientation, religion or any other protected characteristic. Reasonable adjustments are available during the recruitment process.

We know the confidence gap and imposter phenomenon can stop talented candidates applying. You do not need to meet every criterion – your skills and potential matter. Don’t hold back; we want to hear from you.

All recruitment materials comply with legal and regulatory requirements including the EU Pay Transparency Directive and the Equality Acts UK and Ireland.