What Does a Quantity Surveyor Do? A Complete Guide

Whether you're considering a career in quantity surveying, working with a QS for the first time, or simply curious about what the role involves — this guide covers everything you need to know.

Quantity surveying is one of the most commercially critical disciplines in the construction industry, yet it remains one of the least understood by those outside the profession. Ask most people what a quantity surveyor does and you'll get a vague answer involving measurements and buildings. The reality is considerably more interesting — and more valuable.

The Short Answer

A quantity surveyor (QS) manages the financial and contractual aspects of construction projects. From the earliest cost estimates through to the final account, the QS is responsible for making sure a project is delivered within budget, that contracts are properly administered, and that money flows fairly between all parties.

In short — a quantity surveyor is the financial guardian of a construction project.

The Longer Answer

The QS role has evolved significantly over the past two decades. What was once primarily a measurement-based discipline has become a broad commercial function encompassing cost management, procurement, contract administration, risk management and dispute resolution.

A modern quantity surveyor might spend their day:

• Preparing a cost plan for a proposed residential development
• Reviewing a subcontractor's tender and negotiating the price
• Assessing a contractor's interim payment application
• Advising a client on the commercial implications of a design change
• Preparing a compensation event quotation under an NEC4 contract
• Negotiating the final account on a completed project
• Preparing an expert witness report for an adjudication

No two days are the same. No two projects are the same. It is a profession that demands technical knowledge, commercial acumen and strong interpersonal skills in equal measure.

Types of Quantity Surveyor

The QS profession broadly divides into two camps — client-side and contractor-side — though many professionals move between both during their careers.

Client-Side QS (PQS — Private Quantity Surveyor)

The client-side QS works for the employer — the person or organisation funding the construction project. Their primary loyalty is to the client and their role is to protect the client's financial interests throughout the project.

Typical responsibilities include:

• Preparing initial feasibility cost estimates
• Developing detailed elemental cost plans as the design progresses
• Advising on procurement strategy and contract selection
• Preparing tender documents including bills of quantities
• Evaluating tenders and advising on contractor selection
• Administering the contract and certifying payments
• Managing change and valuing variations
• Preparing and agreeing the final account

Client-side QS professionals typically work for private consultancy practices, local authorities, government departments, NHS trusts, developers and major infrastructure clients.

Contractor-Side QS

The contractor-side QS works for the building contractor. Their role is to maximise the commercial return on the contract while delivering the project to the required standard.

Typical responsibilities include:

• Reviewing tender documents and pricing the works
• Procuring subcontractors and suppliers competitively
• Managing the contract sum and monitoring cost against budget
• Preparing and submitting interim payment applications
• Identifying and notifying compensation events and variations
• Preparing and submitting claims for loss and expense
• Negotiating and agreeing the final account

Contractor-side QS professionals typically work for main contractors, specialist subcontractors and design-and-build contractors.

In-House QS

Many large organisations — retailers, developers, infrastructure operators, government bodies — employ in-house quantity surveyors to manage their construction programmes without appointing external consultants. The in-house QS fulfils a hybrid role, often managing external consultants and contractors simultaneously.

What Qualifications Does a Quantity Surveyor Need?

Degree

Most quantity surveyors enter the profession with an RICS-accredited degree in quantity surveying or commercial management. Degrees typically take three years full-time, though many professionals study part-time while working.

Major universities offering RICS-accredited QS degrees include:

• University College London
• University of Reading
• Heriot-Watt University
• Leeds Beckett University
• Northumbria University
• Liverpool John Moores University

RICS Assessment of Professional Competence (APC)

The gold standard professional qualification in the UK is the RICS APC — the Assessment of Professional Competence. After completing their degree and accumulating the required practical experience (typically two years), candidates submit a detailed competency assessment and attend a final assessment interview with a panel of RICS assessors.

Successful candidates are awarded the designation MRICS — Member of the Royal Institution of Chartered Surveyors — and the right to use the Chartered Quantity Surveyor title.

CIOB and ICES

Some quantity surveyors hold qualifications from the Chartered Institute of Building (CIOB) or the Institute of Civil Engineering Surveyors (ICES), particularly those working in civil engineering and infrastructure.

Continuing Professional Development (CPD)

RICS members are required to complete a minimum of 20 hours of CPD per year, of which at least 10 hours must be formal learning. CPD ensures the profession remains current with changes in legislation, contract forms, procurement practice and technology.

What Software Does a Quantity Surveyor Use?

The QS profession has seen significant technology adoption in recent years. Common software includes:

Cost Management

• CostX — industry-standard estimating and cost planning software
• Cubit — popular for bills of quantities preparation
• BCIS — the RICS Building Cost Information Service, providing cost data and indices

Contract Administration

• Asite — cloud-based document management and contract administration
• Procore — project management platform widely used on larger projects
• 4Projects — used extensively on NEC contracts

General

• Microsoft Excel — still the workhorse of the QS profession for cost plans, cashflows and final accounts
• Microsoft Word — for reports, contract correspondence and claims

Emerging Technology

• BIM (Building Information Modelling) — increasingly used for automated quantity takeoff
• AI contract review tools — emerging platforms that analyse contracts for risk
• Digital cost benchmarking platforms — replacing manual BCIS lookups

How Much Does a Quantity Surveyor Earn?

Salaries vary considerably depending on experience, sector, location and whether the QS is employed or self-employed.

London and the South East typically command a 15–25% premium over regional rates. Contractor-side QS professionals often earn more than their client-side counterparts at senior levels, reflecting the commercial intensity of the role.

Self-employed and freelance quantity surveyors typically charge day rates of £350–£700 depending on experience and specialism.

Is Quantity Surveying a Good Career?

The short answer is yes — for the right person.

Quantity surveying offers:

Job security — Construction is a fundamental industry. There will always be buildings to build, infrastructure to maintain and contracts to administer. The QS profession is consistently ranked among the most in-demand in the built environment.

Variety — No two projects are the same. A QS might work on a housing scheme, a hospital, a railway station and a data centre in the space of a single career.

Progression — The profession has clear career pathways from graduate to chartered surveyor to senior leadership. Many of the most successful figures in construction and property started their careers as quantity surveyors.

Commercial relevance — Unlike some technical disciplines that become increasingly specialised, the QS skillset becomes more valuable with seniority. Senior QS professionals are trusted commercial advisers, not just technicians.

Flexibility — The profession lends itself well to flexible and remote working, freelancing, and portfolio careers combining consultancy, expert witness work and advisory roles.

The challenges are also real. The profession can be demanding, deadline-driven and commercially pressured. Contract disputes, difficult clients and tight margins are occupational realities. But for those who thrive on commercial problem-solving, quantity surveying is a genuinely rewarding career.

The Future of Quantity Surveying

The QS profession is changing. Automation, artificial intelligence and digital tools are transforming the more routine elements of the role — particularly measurement, cost data analysis and document review. This is not a threat to the profession but an evolution of it.

The quantity surveyors who will thrive in the next decade are those who embrace technology, develop strong commercial judgement, and position themselves as trusted advisers rather than technicians. The measurement may be automated. The advice — and the relationships — cannot be.

Want to Go Deeper?

QS Support is the professional intelligence hub for quantity surveyors. Our members get access to:

• NEC4 and JCT contract guides — detailed reference resources for day-to-day contract administration
• UK Regional Cost Benchmarks — quarterly updated cost data across all sectors
• Tender Pricing Checklist — a systematic pre-submission checklist used by experienced QS professionals
• CPD webinars — accredited training relevant to the profession

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