A quantity surveyor manages the costs of a construction project from first estimate to final account.
They prepare cost plans, measure quantities from drawings, run the tender process, value work as it progresses, and agree the final account with the contractor. In short, they make sure a building project is delivered on budget and everyone gets paid fairly for the work done.
Key takeaways
- A quantity surveyor controls construction costs from estimate to final account.
- Core tasks: cost estimates, bills of quantities, tendering, valuations, final accounts.
- Most are RICS chartered (MRICS), the industry's professional standard.
- They work for contractors, consultancies, developers, and public bodies.
- Typical UK salaries run from around £30k (graduate) to £60k+ (senior/chartered).
What Does a Quantity Surveyor Actually Do Day to Day?
Early on, a quantity surveyor produces cost estimates and cost plans from architects' drawings so the client knows what the project should cost. They then prepare tender documents, including the bill of quantities, which contractors price to win the job.
During construction they carry out interim valuations, agreeing how much work is complete each month so the contractor can be paid. At the end they negotiate variations and settle the final account.
Cost Planning and Estimates
Before a brick is laid, the quantity surveyor advises whether the design is affordable.
Using cost databases and experience of similar projects, they produce order-of-cost estimates and detailed elemental cost plans that break the budget into foundations, structure, finishes, and services. If the design exceeds the budget, they suggest value engineering: cheaper ways to achieve the same result without cutting quality where it matters.
Tendering and Contracts
The quantity surveyor usually manages the competitive tender: sending documents to shortlisted contractors, answering queries, and levelling bids so the client can compare like with like.
They advise on the form of contract (JCT and NEC are the UK standards) and help negotiate terms. Choosing the right procurement route, traditional, design-and-build, or management contracting, is a key early decision they guide.
Valuations, Variations, and Final Accounts
Once building starts, the quantity surveyor measures progress and certifies monthly payments to the contractor. When the client changes the design mid-build, the surveyor values each variation so costs stay controlled.
They also handle claims for delays or extra costs, assessing what is fair under the contract. The final account, agreed after completion, is the definitive record of what the project cost and why.
How to Become a Quantity Surveyor
The standard route is a RICS-accredited degree in quantity surveying, followed by the Assessment of Professional Competence (APC) to become chartered (MRICS). Degree apprenticeships let you earn while qualifying, and experienced construction professionals can convert via postgraduate courses. Chartered status is optional, yet it remains the industry benchmark most employers expect, and it significantly improves earning power.
FAQ
What does a quantity surveyor do?
They manage construction costs: estimates, tendering, monthly valuations, variations, and the final account, keeping the project on budget.
Do I need a quantity surveyor for a home extension?
For larger extensions, yes: a surveyor's cost plan and tender management often save more than their fee by keeping builders honest on price.
What is the difference between a quantity surveyor and an estimator?
An estimator prices work to win it (usually for a contractor); a quantity surveyor manages costs through the whole project, often for the client.
How much does a quantity surveyor earn in the UK?
Graduates start around £30k, rising to £45k to £60k+ once chartered, with senior and London roles paying more.
What qualifications do quantity surveyors need?
A RICS-accredited degree plus the APC to become chartered (MRICS). Degree apprenticeships offer a debt-free alternative.
What is a bill of quantities?
A bill of quantities is a detailed document listing every measured item of work, which contractors price during tendering.
