What Does a Quantity Surveyor Actually Do?

A quantity surveyor manages the cost and commercial risk of construction projects – from initial feasibility through design, procurement, construction, and final account. The QS ensures that projects are built to budget, that contracts are administered correctly, and that every change in scope is costed, agreed, and documented. They are the financial and contractual backbone of the built environment.

QS professionals operate in two distinct contexts. A PQS (Private or Professional Quantity Surveyor) works on the client side – typically employed by a consultancy – and acts in the client's interest, preparing cost plans, tendering, and monitoring spend. A Contractor QS works for the main contractor or a subcontractor, managing the commercial position from the delivery side: pricing variations, certifying valuations, and pursuing claims. Both roles require the same core technical competencies; the perspective and interests represented are different. According to the Royal Institution of Chartered Surveyors (RICS), there are over 113,000 RICS-qualified members practising globally across both contexts.

Salaries reflect the profession's skill premium: graduate QS roles pay £25,000–£30,000 (£30,000–£40,000 London); MRICS chartered QSs earn £42,000–£58,000 (£55,000–£65,000 London); senior QSs reach £56,000–£75,000 (£70,000–£90,000 London), according to the Maxim Recruitment 2025/26 QS Salary Report. If you are considering this career, the how to become a quantity surveyor guide explains every route in detail.

A Quantity Surveyor's Day in the Life

What does a typical working day look like for a QS in practice? The table below represents a composite day for a mid-level Contractor QS on a £15m residential construction project – though the specific mix of tasks varies significantly by seniority, contract type, and whether you work client-side or contractor-side. The tools listed are widely used across the sector; software proficiency is increasingly a requirement at interview. For a deeper look at how these tasks relate to the QS curriculum, see the course modules overview.

Time of Day	Activity	Tool / Standard Used
08:00–09:00	Site progress review – check programme against actual spend; review previous week's interim valuation certificate	Asta Powerproject / MS Project; cost report spreadsheet
09:00–10:30	Taking-off – measuring quantities from architect's drawings for a new variation instruction (VI); preparing BoQ amendment	RICS NRM2 measurement rules; CostX or On-Screen Takeoff; AutoCAD drawings
10:30–12:00	Subcontractor procurement – reviewing tender returns for mechanical and electrical package; negotiating final prices	Tender comparison spreadsheet; JCT Subcontract form; BCIS cost data
12:00–13:00	Monthly interim valuation submission – pricing measured work completed to date; preparing application for payment	JCT SBC/Q contract; valuation certificate template; Excel
13:30–14:30	Variation account review – agreeing rates with the employer's QS on variation orders instructed in the previous month	NEC3/JCT contract clauses; daywork sheets; RICS daywork schedule
14:30–16:00	Risk and opportunity register update – reviewing commercial risks; assessing impact of delayed steel delivery on programme	Risk register (Excel / Primavera Risk Analysis); contract programme
16:00–17:00	Client cost report preparation – updating forecast final account; briefing the client on projected cost overrun vs contingency	Cost report template; BCIS indices; PowerPoint for client presentation
17:00–17:30	Contract correspondence – drafting a notice under the contract for an extension of time claim caused by client-issued information delays	JCT SBC/Q Clause 2.28 / NEC3 Clause 60.1; contract letter template

NRM2 = RICS New Rules of Measurement 2 (rics.org/nrm). JCT = Joint Contracts Tribunal. NEC = New Engineering Contract. BCIS = Building Cost Information Service (bcis.co.uk).

PQS (Client-Side) vs Contractor QS: Responsibilities Compared

The split between PQS and Contractor QS roles is one of the most important distinctions in the profession – yet it is often overlooked in introductory career guides. Your career trajectory, the type of employer you target, and the day-to-day nature of your work will differ substantially depending on which side of the contract you choose. Both are valid and well-remunerated QS careers; they simply involve different perspectives on the same construction project. The QS salary guide provides a detailed breakdown of pay across both sectors.

PQS Responsibilities (Client/Consultancy Side)

Feasibility cost estimates – order-of-cost estimates at early RIBA Stage 1–2, before design is fixed
Cost planning – elemental cost plans at RIBA Stages 2–4, tracking design decisions against budget
Tender documentation – preparing Bills of Quantities (BoQ) or Schedules of Works for competitive tendering, measured to NRM2 standards
Tender analysis – evaluating contractor tender returns, querying anomalies, recommending contractor selection
Valuation and cost reporting – certifying contractor interim payment applications; issuing cost reports to the client
Contract administration – issuing variation instructions, assessing extension of time claims, managing the final account
Employer: QS consultancies (e.g. Arcadis, Turner & Townsend, Gleeds, Rider Levett Bucknall), developers, public sector bodies

Contractor QS Responsibilities (Contractor/Supply Chain Side)

Pre-contract estimating – pricing tender documents, building up rates from first principles, preparing tender submissions
Subcontractor procurement – tendering and letting packages; comparing quotes; negotiating and placing orders
Interim applications for payment – measuring work done to date; submitting monthly valuations to the employer's QS for certification
Variation management – pricing employer-instructed changes; agreeing rates; maintaining a variation account
Commercial reporting – cost–value reconciliation (CVR); forecasting final project margin; reporting to the commercial director
Claims and disputes – preparing extension of time (EoT) submissions; loss and expense claims; potential adjudication preparation
Employer: Main contractors (e.g. Balfour Beatty, Mace, Kier, Vinci), specialist subcontractors, design-and-build contractors

4 Core Skills Every Quantity Surveyor Needs

These are the four technical competency areas that RICS tests at the APC Final Assessment, and that employers screen for at every level from graduate to senior. The SEG Awards Level 4+5 Diploma curriculum is structured around these four areas, ensuring learners build job-ready skills from the outset. Understanding these competencies also helps you evaluate whether a QS career aligns with your existing professional background – which is explored further in the career change to QS guide.

1. Measurement – NRM2 and Taking Off

Measurement is the defining technical skill of the quantity surveyor. The RICS New Rules of Measurement 2 (NRM2) is the UK industry standard for detailed measurement of construction work for BoQ production. QSs must be able to take off quantities from drawings – accurately measuring lengths, areas, and volumes for every building element – and convert those quantities into priced Bills of Quantities that form part of the contract documents. Measurement underpins every downstream QS function: you cannot price variations, settle valuations, or prepare a final account without the ability to measure. Modern measurement increasingly uses digital tools such as CostX, Bluebeam, and On-Screen Takeoff, though the underlying NRM2 rules govern all measurement regardless of software.

2. Contract Law – JCT and NEC

The two dominant UK construction contract families are the JCT (Joint Contracts Tribunal) and NEC (New Engineering Contract) suites. JCT contracts – particularly the JCT Standard Building Contract with Quantities (SBC/Q) – dominate private commercial and residential development. NEC contracts (particularly NEC3 and NEC4) dominate infrastructure, public sector, and government-procured work. A QS must understand the payment provisions, variation clauses, extension of time mechanisms, and dispute resolution procedures within whichever contract form governs their project. Misreading a contract clause – or missing a notice obligation – can result in claims being time-barred and significant financial loss. The JCT vs NEC contracts guide provides a full comparison of the two contract families.

3. Cost Engineering and Financial Management

Cost engineering encompasses the full lifecycle of project financial management: initial feasibility estimates, elemental cost plans, pre-tender estimates, post-contract cost reporting, cost-value reconciliation, and the settlement of the final account. QSs use BCIS (Building Cost Information Service) data, market tender prices, and first-principles rate build-ups to establish realistic cost benchmarks. They apply cost indices to adjust for inflation, model cashflow profiles, and advise clients on the financial risk of design changes. Effective cost engineering requires a blend of data literacy, commercial intuition, and project management awareness – as well as the ability to communicate financial risk in terms that non-technical clients and project directors can act on. BCIS publishes the most widely used cost indices and elemental cost data in the UK.

4. Negotiation and Stakeholder Communication

Quantity surveying is a commercial function – and commercial functions require negotiation. Whether you are agreeing subcontractor rates, negotiating variation assessments with the employer's QS, settling a final account, or managing a client's expectations on cost overrun, negotiation is a daily competency. Alongside this, QSs must communicate clearly in writing: contract notices, payment certificates, cost reports, and variation orders all carry contractual weight and must be drafted precisely. RICS APC assessors consistently cite communication and professional judgement as the differentiating competencies at Final Assessment – technical measurement skills are assumed as a baseline; what distinguishes a good QS is the ability to apply those skills commercially and communicate the outputs clearly to all stakeholders.

Frequently Asked Questions: What Does a Quantity Surveyor Do?

A PQS (Private or Professional Quantity Surveyor) works on behalf of the client – typically employed by a QS consultancy or directly by a developer, public sector body, or financial institution. Their primary duty is to protect the client's financial interests: keeping the project within budget, running the tender process, certifying payments, and settling the final account. A Contractor QS (or “commercial manager” in some organisations) works on behalf of the main contractor or subcontractor. Their objective is to maximise the contractor's commercial position: winning work at a profitable price, recovering legitimate costs through valuations, managing the variation account, and pursuing claims for delays or additional costs. Both QS roles use the same technical skills and knowledge – measurement, contract law, cost engineering – but they represent opposing interests in the contractual relationship. Many QS professionals start on one side and move to the other during their career to broaden their experience, which is viewed positively by RICS at APC stage.

The terms “quantity surveyor” and “cost manager” are used interchangeably by many employers and are often the same role under different job titles. Large international consultancies – particularly those in the US-origin real estate and infrastructure market – tend to use “cost manager” or “cost consultant” rather than “quantity surveyor”, partly because the QS title carries less brand recognition outside the UK and Commonwealth. In the UK market, QS and cost manager typically refer to the same function. “Cost planner” tends to be used specifically for the earlier-stage, pre-contract cost planning and feasibility function, rather than the full project lifecycle role. “Commercial manager” is common in contracting organisations to describe a senior contractor QS role. For all practical purposes, if you see these titles at a UK employer, the underlying skills, qualifications, and RICS APC pathway are the same.

An estimator typically works in a contracting or manufacturing organisation and focuses specifically on the pre-contract pricing function – building up rates, pricing Bills of Quantities, and preparing competitive tender submissions. Estimators are excellent technical pricers but their role ends when the contract is won. A Contractor QS picks up post-contract – managing the commercial position through construction: valuations, variations, subcontractor accounts, and the final account. The two roles overlap in skills (both require strong measurement and rate-building ability) but differ in scope. Many estimators become contractor QSs as they progress their careers. On the client side, PQSs overlap more with estimators in the pre-tender phase (preparing BoQs and cost plans) but then continue through the full project lifecycle. A QS has broader commercial responsibility and longer-term project involvement than a pure estimator.

A quantity surveyor focuses on the financial and contractual management of construction – cost planning, tendering, payment, and final account. A building surveyor focuses on the physical condition and performance of buildings – condition surveys, planned maintenance, dilapidations, and building regulations compliance. Both are RICS-regulated professions with separate APC pathways and competency sets. In practice, the work of a building surveyor is more closely related to the physical fabric of the building; the work of a QS is more closely related to its construction cost and contract. Some smaller firms employ “general practice” surveyors who do elements of both, but in larger construction organisations the two functions are clearly distinct departments. The RICS careers overview sets out the full range of surveying pathways available.

The most widely used QS software tools in the UK market currently include: CostX (digital measurement and cost planning, used by many major PQS consultancies); On-Screen Takeoff (OST) and Bluebeam Revu (measurement from PDFs and digital drawings); COINS (construction ERP used by many main contractors for commercial management); Procore (project management and cost reporting platform, increasingly common on large schemes); Microsoft Excel (ubiquitous for cost reporting, CVR, and variation accounts – advanced Excel skills are expected at all levels); Asta Powerproject and Primavera P6 (programme management, relevant for extension of time analysis); and BCIS Online (cost benchmarking and indices). Building Information Modelling (BIM) is increasingly integrated into QS workflows, particularly at Level 2+ on public sector projects, with software such as Revit and Navisworks used for model-based quantity extraction. Proficiency in at least two or three of these tools is expected at interview for mid-level roles.

A typical QS career progression runs: Graduate / Trainee QS (£25,000–£30,000) → Assistant QS (£30,000–£40,000) → Quantity Surveyor / MRICS Chartered QS (£42,000–£58,000) → Senior QS (£56,000–£75,000) → Commercial Manager / Associate Director (£70,000–£100,000) → Commercial Director / Partner / Equity Principal (£100,000+). London salaries are £5,000–£15,000 higher at each level, per the Maxim Recruitment 2025/26 Report. The pivotal milestone is achieving MRICS chartered status via the RICS APC – this typically unlocks a salary increase of 15–25% and opens access to senior roles. Beyond MRICS, progression depends on whether you specialise (e.g. infrastructure, disputes, international projects) or move into management and business development. Some senior QSs move into development management, fund management, or construction law. More detail on the progression path is in the online degree pathway guide.

AI and automation are reshaping parts of the QS function – particularly repetitive measurement tasks, cost database management, and document review. Digital measurement tools already semi-automate takeoff from drawings; BIM models can auto-generate quantity schedules; and AI tools are beginning to assist with contract clause interpretation and risk flagging. However, the professional judgement, commercial negotiation, stakeholder communication, and contractual risk management that define the core QS role remain firmly human functions. RICS research consistently identifies the QS profession as among the more automation-resilient in construction, because the value created by a QS is principally through professional judgement and negotiated commercial outcomes – not data entry. The 2024 RICS UK Construction Monitor confirms strong demand for chartered QS professionals with commercial and contract management skills. AI is most likely to change the tools QSs use, not to replace the profession – much as digital measurement replaced manual drawing tables, while the QS's professional role remained central.

Yes – MRICS is a globally recognised professional credential, and UK-trained QSs work across the Middle East, Southeast Asia, Africa, Australia, and Hong Kong, as well as throughout Europe. RICS has over 113,000 members in 156 countries, and the QS discipline is particularly well established in Commonwealth markets where UK contract forms and measurement standards have been adopted. The RICS mutual recognition agreements with professional bodies in Australia (AIQS), Hong Kong (HKICM), and other jurisdictions make international mobility straightforward once chartered. The National Careers Service QS profile notes that “opportunities exist to work abroad” as a specific feature of the profession. UK QSs are in particular demand in Gulf Cooperation Council (GCC) countries, where large infrastructure programmes create significant demand for experienced chartered surveyors – with tax-free salaries considerably above UK market rates at equivalent seniority.

Ready to Build a QS Career?

Start with the SEG Awards Level 4+5 Diploma in Quantity Surveying – entirely online, £130.85/month, and built around a full-time job.

Request a Callback View All Quantity Surveying Resources

How to Become a Quantity Surveyor · QS Salary Guide 2025/26 · Online QS Degree Pathway

What Does a Quantity Surveyor Do?