Senior Quantity Surveyor/Commercial Manager

Vextrix; Greater London; On-site; GBP 70,000 - 105,000; Full time

Benefits offered by this job

28 days annual leave

Private medical insurance

2 volunteering days per year

Annual pay review

Salary sacrifice schemes

Enhanced maternity and paternity leave

Flexible working

Birthday lunches

Job summary

Vextrix in London seeks a Senior Quantity Surveyor/Commercial Manager to lead pre/post contract commercial management on major infrastructure projects, including rail sector work in a design & build environment.

The role requires hands-on NEC contract administration, cost control, value for money, and the ability to manage multiple projects while mentoring junior staff and building strong stakeholder relationships. On-site presence is expected.

Qualifications

• Experience with pre-contract and post-contract commercial management.
• Strong understanding of NEC contracts and change management.
• Proven ability to manage budgets, forecasts and cost control.

Responsibilities

• Lead commercial management on major infrastructure projects.
• Prepare and negotiate valuations, payments and final accounts.
• Provide evidence-based advice to project leadership and clients.
• Mentor junior quantity surveyors and support professional development.
• Maintain accurate records and timely commercial reporting.

Skills

Senior Quantity Surveyor

NEC contracts

Commercial reporting

Client-facing

Contract administration

Cost management

Stakeholder management

Mentoring juniors

Education

Degree in Quantity Surveying

RICS accreditation desired

Tools

NEC3/NEC4

Job description

Senior Quantity Surveyor/Commercial Manager

Vextrix was founded to create a socially conscious business, where all of our clients and staff feel valued. In our growing business we create an environment for our team where each individual can develop and progress, benefitting from the experience of our senior team and exciting opportunities with our clients. Collaboratively, we all live our values and deliver on our unique guarantees which is why our clients trust us as their consultant of choice.

A bit about the role

We are looking for an experienced Senior Quantity Surveyor to become a part of our team, based in our London office; working on and supporting project delivery across a variety of infrastructure sectors. The successful candidate will be interested in working in the Rail sector within a Design & Build environment.

In the role you will provide high-quality pre-contract and post-contract commercial management, helping clients and project teams achieve strong financial control, effective contract administration and value for money.

This is a senior, client facing role which requires hands on experience of infrastructure or rail projects, with and a strong working knowledge of NEC contracts to support the NEC Project Management Team by undertaking Contract Administration and Quantity Surveying duties. You will be supporting the delivery of a major project and will be supported where required by the Project Director and other team members.

We’re looking for someone with the following skills and experience to join our team:

• Quantity Surveying and Cost Management experience on major projects in the infrastructure sector, ideally Rail or relevant Highways or Major Civils experience
• A solid understanding and able to manage estimates, budgets, and feasibility studies throughout the project
• Strong working knowledge of NEC3 and NEC4 contracts, including compensation events, early warnings and change management
• An understanding of procurement, tender analysis, and contract award processes
• Experience in managing post-tender activities including variations, Compensation Events (NEC), and final accounts
• Experience in producing Cost Variance Reports, forecasts, and managing the Contractor invoicing processes
• Experience in managing Contractor/Sub-Contractor accounts and supplier procurement
• Experience of site working including leading contractor meetings and supporting project management teams commercially
• An understanding of compliance processes for Health & Safety, company policies, and contractual obligations
• Monitor committed, forecast and actual expenditure against approved budgets, identifying potential variances and recommending timely corrective action
• Prepare clear and accurate monthly commercial reports covering project costs, cash flow, change, risk, contingency, liabilities and forecast outturn cost
• Lead the preparation, assessment and agreement of valuations, payment applications, payment certificates and final accounts
• Undertake commercial assurance reviews and provide evidence-based advice to clients and project leadership teams
• Excellent commercial awareness, negotiation, analytical and problem-solving skills, with the ability to manage multiple priorities and make informed commercial decisions
• Experience of supporting senior colleagues in maintaining strong stakeholder relationships and supporting business development through exhibiting client focused positive behaviours
• Experience mentoring and developing junior Quantity Surveyors, providing technical guidance and supporting their professional development
• Apply commercial management practices within live rail, station, depot, highways, utilities or other safety-critical infrastructure environments
• Recognise the commercial and programme implications of possessions, isolations, access constraints, operational interfaces, permits, railway standards and stakeholder approvals

Your skills and experience

• Previous experience working as a Senior Quantity Surveyor or Quantity Surveyor within the civils sector
• Client-side experience would be advantageous however experience of Rail or relevant Highways or Major Civils, as Contractor or Consultant, is essential
• Contract knowledge; knowledge of NEC contracts is essential
• Experience of managing, or supporting the management of, contracts in an onsite Main Works Contractor environment
• Commercially aware with excellent reporting and communication skills
• Degree qualified in Quantity Surveying (or equivalent)
• A professional accreditation with a relevant body such as the RICS is desired
• Strong commercial judgement and attention to detail
• A proactive and organised approach to contract administration
• The confidence to challenge constructively and provide independent professional advice
• An ability to identify the key issue within complex commercial and contractual information
• A collaborative approach to working with all stakeholders
• A strong commitment to quality, integrity and professional standards
• The ability to manage competing priorities across several projects or commissions
• A focus on achieving timely decisions, maintaining accurate records and closing out commercial matters
• An understanding of the importance of safety, sustainability, social value and whole-life value in infrastructure investment

The successful candidate will be expected to work on site c50% of the time in the St Albans area for first 2 years of their employment, with opportunities for growth to support other projects regionally and nationally.

Why work for us?

We’re proud to be recognised as a 2024 Times Top 100 Best Companies to Work For, with a culture built around people, inclusion and flexibility. As a Liverpool City Region Fair Employment Charter accredited employer and a Top 100 Most Inclusive Workplaces Index 2026 organisation, we’re committed to creating a workplace where everyone can thrive.

We invest in training and development, support a healthy work-life balance, and celebrate success together, helping our people grow both professionally and personally.

In addition, we also offer:

• 28 days annual leave plus bank holidays
• Private Medical Insurance
• 2 volunteering days per year
• Annual pay review
• Salary sacrifice schemes and discount schemes
• Enhanced maternity and paternity leave
• Enhanced compassionate leave
• Work from home/flexible working
• Birthday lunches

No usual recruitment process

We’re committed to an equal opportunities and inclusive culture for all employees and applicants which values the contribution and potential of every individual, not just what’s on your CV. We welcome applications from everyone and uphold fair, inclusive practices in line with the protected characteristics defined in the Equality Act and we proudly support the trans community.

We recognise everyone has commitments outside work and are happy to discuss flexible working. We will support you throughout the application process. Therefore, if you need any adjustments to our recruitment process, please let us know.