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

Applying for a Assistant Quantity Surveyor job in the UK? Here is what you are likely to be asked. These questions come from our Assistant Quantity Surveyor question bank of 16 questions, written for UK employers at junior level.

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

1. What is a bill of quantities, and how do you take off quantities from drawings?

Why they ask: Measurement is the core skill of a junior QS, so interviewers test your understanding early.

2. What are NRM1 and NRM2, and how do they differ from SMM7?

Why they ask: Knowing the measurement rules shows you can work in a modern UK commercial team.

3. What is the difference between a provisional sum and a prime cost sum?

Why they ask: A basic contract concept that affects pricing, risk and variations.

4. How do you prepare an interim valuation, and what documents do you use?

Why they ask: Valuations drive cash flow, so employers want to know you can be accurate and fair.

5. How do you value a variation, and what makes a good variation record?

Why they ask: Variations are a key source of disputes, so records and pricing method matter.

6. A subcontractor submits an application for payment that is significantly higher than your assessment. What do you do?

Why they ask: Valuation disputes are routine, and you need to show fairness and process knowledge.

7. Tell me about a time your attention to detail prevented a problem.

Why they ask: Accuracy is vital for a QS, and interviewers want evidence of checking habits.

8. Why do you want to be a quantity surveyor?

Why they ask: Checks commitment to the profession and understanding of what it involves.

A sample answer to question 1

What is a bill of quantities, and how do you take off quantities from drawings?

A bill of quantities is a document that lists the work items in a project, with quantities measured from the drawings and specification, so every contractor prices the same scope. It is usually prepared following a set of rules such as NRM2 for detailed measurement of building works. For taking off, I first check the drawings are current and consistent, then set up a dimension sheet or use measuring software such as Bluebeam or CostX. I work in a logical order, for example substructure, superstructure and finishes, measure each element in the correct unit, whether it is metres, square metres, cubic metres or numbers, and apply the rules about deductions and voids. I note assumptions, query anything missing and record revisions. Once complete, I check the totals by sense, for example comparing floor area against wall area or concrete volume per square metre. Finally, I have the work checked by a senior colleague before it is issued.

Common mistake to avoid: Measuring from outdated drawings; Not recording assumptions

Want the rest?

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