Location
London

Hours
Full Time, hybrid working with occasional travel to client sites

Salary
Negotiable

About the Role
Arcadis is the world's leading company delivering sustainable design, engineering, and consultancy solutions for natural and built assets. With over 34,000 people across more than 30 countries, we are dedicated to improving quality of life by solving complex challenges together.
As a Senior Cost Consultant within our Cost and Commercial Assurance (CCA) practice, you will support assurance reviews on major programmes, focusing on NEC3/NEC4 Option C (Target Cost) and/or Option E (Cost Reimbursable) contracts. You will apply core Quantity Surveying skills and commercial audit techniques to validate costs, strengthen contract controls, and provide actionable insights.
This role combines traditional QS expertise with digital tools to improve efficiency and transparency. You will plan and deliver cost and commercial assurance reviews including open-book validation, pain/gain calculations, fee/risk allowances, and disallowed costs. You will support payroll and timesheet audits, cost verification across labour, plant, materials, and subcontractors, and reconcile samples to source records.
Additional responsibilities include reviewing compensation events, early warnings, and target movements to provide evidence-based analysis supporting dispute avoidance. You will assess contract compliance and commercial control frameworks, contribute to process and reporting improvements, and prepare clear findings reports and dashboards for project teams.
Utilising data and low-code/no-code tools such as Excel/Power Query and Power BI, you will automate testing and analytics to enhance efficiency and transparency in project delivery.

Experience
- Degree in Quantity Surveying, Commercial Management, or related field
- Professional membership (RICS, CICES or equivalent)
- Experience with NEC3/NEC4 contracts (Option C and/or Option E)
- Exposure to commercial or payroll audits on projects or frameworks
- Core Quantity Surveying skills including measurement, estimating, valuation, change control, and forecasting
- Ability to interpret datasets and trace costs to source evidence
- Proficiency with Excel and data analysis tools
- Experience using Power Query, Power Automate; basic knowledge of SQL or Python is advantageous
- Sector experience in infrastructure such as transport, water, or energy

About you
- Strong communication and stakeholder engagement skills
- Ability to challenge constructively and support corrective actions
- Curious and proactive in adopting digital tools and low-code/no-code solutions
- Collaborative mindset with a commitment to delivering sustainable solutions

Qualifications
- Degree or equivalent qualification in Quantity Surveying, Commercial Management, or related discipline
- Professional membership with RICS, CICES, or equivalent body