What is a quantity surveyor? QS stands for quantity surveyor: the engineer who handles quantities, cost and contracts on a construction project.
This is the person who follows the money from the tender until the final account is settled. The work covers measurement, contract administration, interim payment applications and variations.
At a large contractor the QS function is a whole department. At a small one it is a single role held alongside others. In Vietnam the job is usually advertised as QS engineer or quantities engineer.
That is the short answer. The rest of this article takes each part in turn. First, which department the QS belongs to, and how the role differs from a cost estimator and from QA/QC. Then the work stage by stage, what it pays by experience, and the steps from student to senior QS.
Ask ten civil engineering students the same question and most will answer "a cost estimator". That is half right — and the other half is the half that decides the salary.
Who the QS is on a project, and how the role differs from a cost estimator
QS stands for quantity surveyor. In the United Kingdom and the countries that follow its system, quantity surveying is a profession in its own right, with its own institution (RICS) and an existence independent of design engineering. In Vietnam the title is usually translated as cost engineer or quantities engineer, but the actual scope of the work is considerably wider than preparing estimates.
The simplest way to tell the two apart is by when they work:
- The cost estimator works mainly before construction. They measure quantities from the design drawings and produce the estimate that goes for appraisal, approval and then tendering. Most sit with the design consultant, the project management unit or the appraising body.
- The QS works across the whole project, mostly on the contractor's side and partly for the client. They measure to bid, manage the contract, track quantities as they are built, prepare each interim payment application, deal with variations, and close out the final account.
In one sentence: the cost estimator answers "how much will this project cost". The QS answers, in addition, "how is that money being spent, how much has come in, and does the rest match the contract". The QS is the person holding the money on the contractor's side, and that is why the role pays more than pure estimating at the same number of years.
If your estimating foundation is not solid yet, Where to start learning construction cost estimating? is the ground to cover before quantity surveying. The part only a QS does — the contract, interim payments, variations and the final account — is the core of the Quantity Surveyor course at the Institute.
Which department the QS belongs to
This is searched almost as often as the definition itself, because job adverts show both "QS department" and "QS engineer" without making clear whether they mean the same thing.
They both apply. The difference is company size.
At a large contractor the QS function is its own department, named differently from firm to firm: QS department, quantities department, contracts department, or a section within the commercial division. It reports to the board or to the commercial director rather than to the construction department. The reason is independence: the person certifying quantities should not be the person answerable for progress on site.
Inside a fully staffed QS department the work splits along three lines:
- Tender QS — measures and prices the bid.
- Contract QS — reviews clauses, tracks variations, deals with the client and subcontractors.
- Site QS — works from the site, agreeing quantities completed in each cycle.
- QS manager or chief QS — signs off the numbers before anything leaves the company.
At small and mid-sized contractors one or two people cover all of it. Harder work, but a much faster education, because one person sees a whole cycle of money through a project.
On the client side, the equivalent people usually sit in the planning and cost control department. They work from the checking end, appraising the quantities and payment applications the contractor submits.
At consultancies, the nearest function is the estimating and estimate-appraisal team.
The QS works most closely with three other functions: construction (for what has actually been built), bidding (for pricing), and finance (for cash flow, invoices and balances).
QS, QA and QC: three different jobs
Three two-letter abbreviations beginning with Q circulate on every site, and they get mixed up constantly even though they have nothing in common.
| Follows | Main output | Question answered | |
|---|---|---|---|
| QS — quantity surveyor | Quantities, cost, contracts | Tender submission, payment applications, final account | What is this work worth, how much is done, who pays |
| QA — quality assurance | The process that produces quality | Procedures, forms, quality plans | Is the method robust enough to avoid defects |
| QC — quality control | The finished product on site | Inspection records, test results | Does what was just built meet the specification |
In short: QS follows the money, QA follows the process, QC follows the product. When a concrete pour is complete, QC takes the test cubes while the QS measures the quantity for the payment application. Two people looking at the same element for entirely different reasons.
A cost estimator, by contrast, differs from a QS in when the work happens rather than in what kind of work it is — the section above covers that.
What a QS does day to day, stage by stage
The work changes with the stage of the project, so a QS's day in month one looks nothing like a QS's day in the final month.
Tender stage. The QS receives the tender documents, then reads the drawings and the conditions of contract. Next comes re-measuring the quantities and comparing them against the tender bill of quantities, the BOQ — the rule of the trade being never to trust the client's BOQ until it has been checked. After that the QS collects quotations from suppliers and subcontractors and builds the tender price with the bidding team. The QS numbers are the input management uses to settle on a bid price, so an error at this stage carries through every calculation that follows.
Award and contract stage. The QS goes through every clause covering quantities, rates, price adjustment, variations, advance payment, interim payment, retention and defects liability. Many young engineers avoid this part because "it is all words", but over a few years it is the part that creates the largest difference in earnings.
Construction stage. Each month or each cycle, the QS agrees completed quantities with the site engineers, checks them against the as-built drawings, and submits the payment application to the client or the supervision consultant. Running alongside is the variation record: which work falls outside the contract, who instructed it, whether there is an instruction in writing, and how it is to be valued. With subcontractors the QS works the other way round, checking and certifying what they claim.
Completion stage. The QS assembles all quantities, variations and price adjustments into the final account, reconciles the balance with the client and the subcontractors, and tracks the defects liability period. A tidy final account with its evidence in order can shorten collection from years to months.
At a large company these tasks are split between several people — tender QS, contract QS, site QS. At a small or medium company one QS does all of it: harder, but a much faster education.
QS salary in Vietnam, by experience and type of company
This article gives no absolute figures. Salaries drift year by year, so a number printed today would be wrong within a few years. The table below gives the ratio between grades in the QS career instead, and that ratio moves slowly.
The baseline is the starting salary of a graduate QS in the same period as you. To find it, check Indeed Vietnam or filter by job title on the major recruitment sites.
| Stage | Experience | Relative to a starting salary | Notes |
|---|---|---|---|
| Junior QS | 0–1 year | 1× (the baseline) | Mainly measurement, supporting payment applications |
| QS | 2–5 years | about 1.5–2× | Runs the contract and payments on one project |
| Senior QS, team leader | 5–8 years | about 2–2.7× | Several projects or one large project; mentors junior QS |
| QS manager, contracts manager | 8 years and above | from about 3.5× | Large contractors and foreign-funded projects can pay considerably more |
Three things pull a QS's salary away from that table:
- Type of company. Main contractors and general contractors pay more than consultancies; foreign-funded projects, where the contract is FIDIC-based and the working language is English, pay more than domestic projects at the same level.
- Contract skill. A QS who only measures is paid like a cost estimator. A QS who can handle variations, price adjustment and payment disputes is paid like the person holding the money.
- English and international credentials. On foreign-funded projects, technical English is a condition of entry, and a qualification such as RICS is a strong advantage — even though few people in Vietnam hold one.
Skills and software a QS is expected to have
Employers test new QS candidates on four groups of skills, in roughly the order they ask about them:
- Reading drawings and measuring quantities. This is the entrance test at almost every company: here is a drawing, measure part of it. What is quantity take-off? Seven mistakes beginners make lists the errors they are waiting for you to make.
- Estimating and tender pricing. Understanding norms, unit rates and cost structure under the framework in force — from 1 July 2026 that means Decree 206/2026/ND-CP and Circular 36/2026/TT-BXD. Anyone who has never produced a complete estimate should work through the Construction Cost Estimating course before applying for QS roles.
- Construction contracts. The contract types (lump sum, fixed rate, adjustable rate), and the clauses on payment, variations, penalties and defects liability; on foreign-funded work, FIDIC.
- Payment applications and final accounts. Knowing what a payment application contains, which supporting evidence is mandatory, and how to reconcile it with the as-built drawings.
On software, a QS uses AutoCAD daily to read and measure drawings, Excel at a genuinely fluent level for quantity schedules and reconciliations, and one of the Vietnamese estimating packages (G8, F1, Eta, GXD and others). A growing number of companies also ask for the ability to read a Revit or Navisworks model and take quantities from it. None of these tools is hard. What is hard is knowing what you are measuring.
From student to senior QS, and where to learn the work
Final year at university. Get solid at reading drawings and measuring, then use your graduation project to produce one complete quantity schedule and estimate of your own. That is the piece of work to bring to an interview.
Years one and two (junior QS). Join a contractor, including a small one, so that you get to do the whole job. The goal is one full lap of a project: from tender through at least a few payment cycles. Read the contract on your own project even before anyone hands it to you.
Years three to five (QS). Take charge of the contract and payments on a project; be able to handle variations; start on technical English and FIDIC if you want to work on foreign-funded projects.
After year five (senior QS). Run several projects, train junior staff, take part in contract negotiation. Many senior QS move on to contracts management, project cost control, or independent consultancy.
As for where to learn: university teaches the foundations — drawings, structures, construction economics — but few programmes teach the QS role end to end. Contracts, payment and final accounts are usually learned at a company or on a professional course. The Quantity Surveyor course – 13 sessions at the Institute of Information Technology in Civil Engineering is built around that project life cycle: orientation, as-built drawings, measurement, contracts, estimating, tendering, quality records, payment and final accounts. It is taught by a QS working at a main contractor, with measurement exercises and live correction sessions. Anyone whose estimating is shaky should take Construction Cost Estimating first; anyone coming from outside the industry should start with Construction Drawing Reading.
Frequently asked questions
What is a quantity surveyor, in one sentence?
The person who manages the quantities, the costs and the contract of a project on the contractor's side, from tender through to the closed final account. A cost estimator concentrates on the estimating stage before construction begins.
Does a quantity surveyor have to go to site?
Yes, but not permanently the way a site engineer does. The QS goes out to agree quantities, check variations and compare against the as-built drawings; most of the remaining time is spent with drawings, contracts and spreadsheets.
Which degree do you need to work as a QS?
Most commonly construction economics, civil and industrial construction, or transport engineering. People from accounting and economics also do the job well once they have learned to read drawings and measure — and in practice many QS who are strong on contracts come from exactly that background.
QS or cost estimator — which should I choose?
If you prefer steady work with less argument, and a consultancy or project management unit suits you, choose estimating. If you can take the pressure, enjoy working with numbers and contracts, and want earnings that follow your capability, choose QS work with a contractor.
Can women work as quantity surveyors?
Yes, and the proportion of women in QS roles is markedly higher than among site engineers, because the work leans towards records, calculation and dealing with counterparties rather than running a site.
Do I need a practising certificate to work as a QS?
No. People used to aim for the construction cost appraisal certificate, but it has not been issued since 1 July 2026. Decree 212/2026/ND-CP states that the competent authority no longer issues either the Cost Appraisal or the Project Management practising certificate; both fields now go by demonstrated capability and experience instead. What replaces the certificate is an experience record: the projects you worked on, your role in each, and the documents you actually produced — estimates, tender submissions, settlement files. That is what employers and clients genuinely examine, so keep the record from your first project rather than reconstructing it before an interview.
What does QS stand for?
Quantity Surveyor: the person who measures and manages quantities. In Vietnamese firms the role is usually called kỹ sư QS or quantity engineer. At many contractors it is simply the estimator working on the contractor's side.
Is QS a position or a department?
Both are used. At a large contractor, QS is a department with several engineers. At a small one, it is a position, often one or two people who also handle estimating and payment applications.
What does a QS do day to day on a construction project?
Measure quantities from the drawings and from the works as built, check them against the contract, prepare each interim payment application, track variations, and compile the final account at the end. The section above describes this stage by stage.