Managing Quantity Surveyor

Onnec; Greater London; On-site; GBP 90,000 - 120,000; Full time

Job summary

ONNEC Group in London is seeking a Managing Quantity Surveyor to lead the commercial and financial performance of major infrastructure and data centre projects.

You will mentor QS teams, manage cost reporting, procurement, and variations, and ensure governance and risk controls while working with clients and supply chain.

This hands-on leadership role requires strong negotiation skills, NEC/JCT knowledge, and a proactive approach to improving processes and project delivery.

Qualifications

• Senior QS or commercial leadership experience in construction, infrastructure, or data centres.
• Strong forecasting, budgeting, and cost-control skills.
• Experience leading and developing commercial teams.
• Excellent stakeholder management and negotiation abilities.
• Knowledge of NEC/JCT contracts and commercial risk management.

Responsibilities

• Lead the commercial and financial performance of major infrastructure and data centre projects.
• Mentor and develop Quantity Surveyors and commercial teams.
• Oversee governance: cost reporting, valuations, procurement, variations, cashflow, audits.
• Collaborate with project managers, planners, clients, contractors and leadership to deliver projects.
• Support contract management, risk mitigation, final accounts and settlements.
• Lead stakeholder engagement during reviews, meetings and bids.
• Drive improvement of commercial processes, governance and reporting.
• Align planning functions with programme management and controls.
• Promote early resolution of disputes and proper contract administration.
• Contribute to long-term commercial strategy and growth.

Skills

Senior QS

Commercial leadership

Forecasting

Budgeting

Stakeholder management

NEC/JCT contracts

Team development

Data centre experience

Infrastructure projects

Job description

ONNEC Group are a leading independent technology partner and global integrator, with over 30 years experience, and a 800+ team of global experts, specialising in providing end-to-end connectivity solutions that propel organisations everywhere.

From structured cabling to managed services, our end-to-end services give infrastructure that can be completely reliedon. Design. Build. Deploy. Optimise. We offer a complete solution for business connectivity.

We are a rapidly growing organisation and finding and retaining the highest calibre of people is fundamental to us for the success of our business, we work hard to create a challenging, supportive and satisfying working environment for all our employees. ONNEC has successfully achieved the Investors in Diversity Foundational Award for our commitment to equality, diversity and inclusion in the workplace.

The Managing Quantity Surveyor will lead and develop ONNEC's commercial function across complex infrastructure cabling and data centre projects. Working closely with project and business leaders, you will drive commercial best practice, manage risk, ensure contractual compliance, and support the successful delivery of projects.

This is a hands-on leadership role, requiring close collaboration with Quantity Surveyors, planners, operational teams, clients, and supply chain partners. You will help build a scalable commercial structure, oversee commercial performance, and ensure the timely resolution of commercial matters while promoting proactive risk management and strong stakeholder engagement.

What you’ll be doing as ourManaging Quantity Surveyor:

• Lead the commercial and financial performance of major infrastructure and data centre projects, ensuring strong budget control, forecasting, profitability, and risk management.
• Manage, mentor, and develop Quantity Surveyors (QSs) and commercial teams, driving high standards, performance, and career development.
• Oversee project governance, including cost reporting, valuations, procurement, variations, cashflow, and commercial audits.
• Work closely with Project Managers, Planners, clients, contractors, and senior leadership to ensure successful project delivery and commercial compliance.
• Support contract management, risk mitigation, final accounts, and commercial settlements while protecting company margins.
• Lead stakeholder engagement, providing commercial expertise during project reviews, client meetings, and bid activities.
• Drive continuous improvement of commercial processes, systems, reporting, and governance across the business.
• Manage planning functions by aligning programme management, commercial controls, and project performance reporting.
• Promote early resolution of commercial issues and disputes, ensuring effective contract administration and lessons learned are implemented.
• Contribute to the company's long-term commercial strategy, resource planning, and organisational growth.

What we’re looking for in our Managing Quantity Surveyor:

• Senior QS or commercial leadership experience within construction, infrastructure, or data centres.
• Strong commercial and financial management skills, including forecasting, budgeting, and cost control.
• Proven experience leading and developing commercial teams.
• Excellent stakeholder management and negotiation skills.
• Knowledge of NEC/JCT contracts, commercial risk management, and project delivery.
• Hands-on leadership style with the ability to drive commercial performance.
• Experience on large-scale infrastructure or hyperscale data centre projects.
• Knowledge of commercial governance frameworks and planning functions.

Key Behaviours

• Leads by example.
• Collaborative and solution-focused.
• Hands-on and approachable.
• Resilient and adaptable in a fast-paced environment.