Senior Quantity Surveyor Interview Questions UK: 8 Real Questions and What Interviewers Want

Before your Senior Quantity Surveyor interview, it helps to see the questions from the interviewer's side. We have picked eight from our set of 16 and added the reason each one gets asked.

Eight Senior Quantity Surveyor interview questions, and what the interviewer is thinking

1. How do you manage the commercial risk on a project from start to final account?

Why they ask: Senior QSs are responsible for protecting margin and avoiding disputes across the whole lifecycle.

2. How do compensation events work under NEC4, and how do you assess them?

Why they ask: NEC is widely used on UK public and infrastructure work, so a senior QS must be fluent in it.

3. How would you prepare and present a claim for loss and expense or an extension of time under JCT?

Why they ask: Claims are high-value, evidence-based and require careful contractual argument.

4. What happens in adjudication under the Construction Act, and what is your role in preparing for one?

Why they ask: Adjudication is common in UK construction, and senior QSs are often central to the process.

5. How do you produce a reliable forecast of final cost and margin for a live project?

Why they ask: Forecasting drives company decisions and requires judgement as well as numbers.

6. A significant subcontractor goes into administration part-way through the project. What do you do?

Why they ask: Insolvency is a real risk, and a senior QS must act quickly to protect the project.

7. Tell me about a time you negotiated a final account and what approach you took.

Why they ask: Final accounts are a core senior QS task and indicate commercial skill.

8. What does a senior quantity surveyor do day to day, and how does the role differ from a QS?

Why they ask: Checks your understanding of seniority, accountability and the wider commercial role.

A sample answer to question 1

How do you manage the commercial risk on a project from start to final account?

I begin at handover from the estimating team, reviewing the tender build-up, risks and assumptions, and setting up the cost control framework, including the budget, subcontract packages and the cost reporting structure. I read the main contract carefully for notice requirements, valuation dates, payment mechanisms and change procedures, and brief the project team on them, because late notices can lose entitlement. During the project, I monitor monthly cost-to-complete forecasts, track variations and compensation events, manage subcontract procurement and report to the commercial director. I maintain a live risk and opportunity register, which I update with the project manager. I assess each valuation, issue payment and pay less notices on time, and keep records of instructions, delays and disruption. Towards completion, I prepare the final account early, agree subcontractor accounts, and negotiate with the client's QS. I also use lessons learned to feed back to estimating. The aim is no surprises at the end.

Common mistake to avoid: Leaving final account until completion; Missing contractual notice dates

Want the rest?

Full model answers, key points and common mistakes for all 16 questions are on the Senior Quantity Surveyor interview questions page. The first five are free, no sign-up needed.