INTERVIEW

Master Your Quantity Surveyor Interview

Get ready with real questions, expert model answers, and actionable tips designed for quantity surveying roles.

12 Questions
90 min Prep Time
5 Categories
STAR Method
What You'll Learn
Provide candidates with a comprehensive set of interview questions, model answers, and preparation resources tailored to the Quantity Surveyor role.
  • Cover technical, behavioral, and industry‑specific topics
  • Showcase STAR‑formatted model answers
  • Map each question to key surveying competencies
  • Offer follow‑up probes and evaluation criteria
  • Include a timed practice pack for mock interviews
Difficulty Mix
Easy: 30%
Medium: 50%
Hard: 20%
Prep Overview
Estimated Prep Time: 90 minutes
Formats: Technical, Behavioral, Scenario‑Based
Competency Map
Cost Management: 25%
Contract Administration: 20%
Project Management: 20%
Risk Assessment: 20%
Communication & Stakeholder Management: 15%

Technical Knowledge

Describe the steps you follow to prepare a Bill of Quantities (BOQ).
Situation

On a recent commercial office fit‑out project, the client required a detailed BOQ for tendering.

Task

My task was to produce an accurate BOQ that reflected all measurable items and complied with the client’s specifications.

Action

I reviewed the design drawings, broke the project down into work packages, measured quantities using CAD tools, applied appropriate measurement rules (e.g., RICS New Rules of Measurement), and cross‑checked with the contractor’s take‑off. I also consulted with the design team to resolve ambiguities.

Result

The final BOQ was delivered two days ahead of schedule, achieved a variance of less than 2% between estimated and actual costs, and was praised by the client for its clarity.

Follow‑up Questions
  • How do you handle discrepancies between design and on‑site conditions?
  • What software do you prefer for quantity take‑off and why?
Evaluation Criteria
  • Clear step‑by‑step methodology
  • Reference to industry standards
  • Evidence of accuracy controls
  • Use of appropriate tools
Red Flags to Avoid
  • Vague description of steps
  • No mention of verification or standards
Answer Outline
  • Review drawings and specifications
  • Break project into work packages
  • Measure quantities using reliable tools
  • Apply standard measurement rules
  • Cross‑check with contractors and resolve ambiguities
  • Compile and review the BOQ before submission
Tip
Mention specific measurement standards (e.g., RICS NRM) to demonstrate professional knowledge.
What are the main differences between a lump‑sum contract and a measurement‑based contract?
Situation

During a tender review for a mixed‑use development, the client asked me to compare contract options.

Task

I needed to explain the key distinctions and implications for cost control.

Action

I outlined that a lump‑sum contract fixes the total price at the outset, placing risk on the contractor, while a measurement‑based contract (e.g., remeasurement) bases payment on actual quantities measured on site, sharing risk and allowing flexibility for design changes. I highlighted impacts on cash flow, risk allocation, and the need for accurate measurement in the latter.

Result

The client chose a hybrid approach, using lump‑sum for well‑defined works and measurement‑based for variable scope, which improved cost predictability and reduced change‑order disputes.

Follow‑up Questions
  • When would you recommend a target cost contract?
  • How do you manage variations under a measurement‑based contract?
Evaluation Criteria
  • Accurate definition of each contract type
  • Understanding of risk and cost implications
  • Practical examples of application
Red Flags to Avoid
  • Confusing the two contract types
  • Omitting risk discussion
Answer Outline
  • Lump‑sum: fixed price, contractor bears quantity risk
  • Measurement‑based: price based on actual measured quantities
  • Risk allocation differences
  • Implications for cost control and change management
  • Typical use cases for each contract type
Tip
Tie the explanation to real project scenarios to show practical insight.
How do you calculate provisional sums and why are they used?
Situation

In a residential development, several items such as specialist lighting and external works were not fully defined at the design stage.

Task

I was asked to include provisional sums in the cost plan.

Action

I estimated each provisional item based on historical data, market rates, and a contingency percentage, documented the assumptions, and added them as separate line items in the BOQ with clear descriptions.

Result

The provisional sums provided a transparent budget buffer, allowing the project to proceed without delays while keeping the client informed of potential cost impacts.

Follow‑up Questions
  • How do you monitor and adjust provisional sums during construction?
  • What risks are associated with over‑reliance on provisional sums?
Evaluation Criteria
  • Methodical estimation approach
  • Clear rationale for contingency
  • Documentation of assumptions
Red Flags to Avoid
  • Providing a single generic figure without breakdown
Answer Outline
  • Identify items with incomplete scope
  • Use historical cost data and market rates
  • Apply a contingency factor
  • Document assumptions and include as separate line items
Tip
Emphasize the importance of regular review and updating of provisional sums as design matures.
Explain how you would conduct a value engineering exercise on a project.
Situation

Mid‑way through a hospital construction, the client requested cost reductions without compromising functionality.

Task

Lead a value engineering (VE) workshop to identify savings.

Action

I assembled a multidisciplinary team, defined the VE objectives, reviewed the functional requirements, and applied the FAST (Function Analysis System Technique) method to rank functions. We generated alternative solutions, performed cost‑benefit analysis, and assessed impacts on schedule and risk.

Result

The VE process delivered a 7% reduction in the project budget, saved 3 weeks on the critical path, and maintained all critical clinical functions, earning client commendation.

Follow‑up Questions
  • What criteria do you use to prioritize VE ideas?
  • How do you ensure that VE does not compromise quality?
Evaluation Criteria
  • Structured VE methodology
  • Collaboration across disciplines
  • Quantifiable cost and schedule impact
Red Flags to Avoid
  • Skipping functional analysis
  • Focusing only on cost without risk assessment
Answer Outline
  • Form multidisciplinary VE team
  • Define objectives and scope
  • Analyze functions using FAST
  • Generate alternatives
  • Cost‑benefit and risk analysis
  • Recommend and implement approved changes
Tip
Mention specific VE tools (e.g., FAST, LCCA) to demonstrate depth of knowledge.

Behavioral

Tell us about a time you had to resolve a disagreement with a contractor over a variation claim.
Situation

During a high‑rise office build, the contractor submitted a variation claim for additional steelwork that the client considered out of scope.

Task

My role was to mediate and reach a fair resolution.

Action

I reviewed the original contract documents, compared the claim against the design intent, and organized a joint meeting with the contractor, design engineer, and client representative. I presented a detailed cost breakdown, highlighted contractual clauses, and proposed a compromise based on a revised scope.

Result

We agreed on a reduced variation amount that saved the client £45,000 and maintained the project schedule, while preserving a positive working relationship with the contractor.

Follow‑up Questions
  • How do you document the outcome for future reference?
  • What steps do you take to prevent similar disputes?
Evaluation Criteria
  • Evidence of thorough contract review
  • Effective stakeholder communication
  • Outcome that balances cost and relationship
Red Flags to Avoid
  • Blaming the contractor without analysis
  • Lack of documented follow‑up
Answer Outline
  • Gather contract documents and claim details
  • Analyze claim against scope and clauses
  • Facilitate a joint meeting with stakeholders
  • Present evidence‑based cost analysis
  • Negotiate a mutually acceptable settlement
Tip
Highlight the importance of written minutes and updated variation registers.
Give an example of how you managed a tight deadline while ensuring cost accuracy.
Situation

A client accelerated the handover date of a retail development by four weeks, putting pressure on the final cost reconciliation.

Task

I needed to finalize the final account within the new deadline without compromising accuracy.

Action

I re‑prioritized the reconciliation tasks, deployed a small team to work in parallel on different cost packages, used automated spreadsheet macros to speed up data validation, and held daily stand‑up meetings to track progress and resolve issues instantly.

Result

The final account was submitted two days before the revised deadline, with a variance of only 0.8% from the provisional estimate, earning commendation from senior management.

Follow‑up Questions
  • What tools did you use to automate the process?
  • How did you ensure team quality under pressure?
Evaluation Criteria
  • Clear time‑management strategy
  • Use of technology to improve efficiency
  • Maintaining accuracy metrics
Red Flags to Avoid
  • Compromising on verification steps
  • No measurable outcome
Answer Outline
  • Re‑prioritize tasks and allocate resources
  • Leverage automation for data validation
  • Implement daily progress reviews
  • Maintain rigorous checks despite speed
Tip
Quantify the time saved and accuracy achieved to illustrate impact.
Describe a situation where you identified a cost‑saving opportunity that was initially overlooked.
Situation

During the early cost planning stage of a university campus project, the initial estimate for external works was high.

Task

Identify potential savings without affecting design quality.

Action

I benchmarked the external works against similar projects, discovered that the specified paving material was over‑specified, and proposed an alternative with equivalent performance at a lower cost. I also suggested consolidating some landscaping items to reduce mobilization expenses.

Result

The alternative material saved £120,000 and the landscaping consolidation saved an additional £30,000, totaling a 5% reduction in the external works budget.

Follow‑up Questions
  • How did you gain stakeholder buy‑in for the alternative material?
  • What risk assessments did you perform before recommending changes?
Evaluation Criteria
  • Analytical approach to benchmarking
  • Clear presentation of savings
  • Consideration of performance and risk
Red Flags to Avoid
  • Suggesting cuts without justification
  • Ignoring quality implications
Answer Outline
  • Benchmark against similar projects
  • Review material specifications
  • Propose cost‑effective alternatives
  • Quantify savings and obtain approval
Tip
Emphasize collaboration with design and procurement teams to validate alternatives.
How do you stay current with changes in construction law and measurement standards?
Situation

In my role as a senior quantity surveyor, regulatory updates can impact contract administration and cost estimation.

Task

Maintain up‑to‑date knowledge and disseminate it to the project team.

Action

I subscribe to RICS publications, attend quarterly CPD seminars, participate in industry webinars on new legislation, and maintain a shared knowledge base where I summarise key changes and their practical implications for ongoing projects.

Result

This proactive approach has prevented compliance issues on three recent projects and improved the team's confidence in handling contractual variations.

Follow‑up Questions
  • Can you give an example of a recent legislative change you applied?
  • How do you assess the impact of new standards on existing contracts?
Evaluation Criteria
  • Commitment to continuous learning
  • Practical mechanisms for knowledge sharing
  • Demonstrated impact on project outcomes
Red Flags to Avoid
  • Passive learning without application
  • No evidence of sharing knowledge
Answer Outline
  • Subscribe to professional bodies (RICS, CIOB)
  • Attend CPD events and webinars
  • Maintain a shared knowledge repository
  • Brief project teams on relevant updates
Tip
Mention specific sources like the RICS New Rules of Measurement (NRM) updates.

Industry Practices

What software tools do you use for quantity take‑off and cost estimating, and why?
Situation

On a mixed‑use development, accurate take‑off and rapid cost updates were critical.

Task

Select and justify the software tools for the project.

Action

I used Bluebeam Revu for PDF take‑off because of its measurement accuracy and markup capabilities, and integrated the data into CostX for automated cost estimating and 3D BIM‑linked quantity extraction. The combination allowed real‑time cost updates as the model evolved.

Result

The workflow reduced the take‑off time by 35% and improved estimate accuracy, leading to a tighter cost control margin of 3%.

Follow‑up Questions
  • How do you ensure data integrity when transferring quantities between tools?
  • What challenges have you faced with BIM‑linked estimating?
Evaluation Criteria
  • Specific tool names and features
  • Clear rationale linking tool to project needs
  • Quantifiable efficiency gains
Red Flags to Avoid
  • Generic statements without tool specifics
Answer Outline
  • Bluebeam Revu for PDF measurement
  • CostX for cost estimating and BIM integration
  • Explain benefits: speed, accuracy, data linkage
Tip
Highlight any certifications or advanced training you have on the software.
Explain the concept of 'Earned Value Management' (EVM) and its relevance to a Quantity Surveyor.
Situation

A client required tighter cost and schedule control on a large infrastructure project.

Task

Integrate EVM metrics into the cost reporting process.

Action

I collaborated with the project controls team to define the baseline budget (BAC) and schedule, then calculated PV (Planned Value), EV (Earned Value), and AC (Actual Cost) each month. I produced CPI and SPI reports, highlighted variances, and recommended corrective actions such as re‑forecasting and scope adjustments.

Result

The EVM dashboard enabled early detection of a 5% cost overrun, allowing the team to implement value engineering measures that brought the project back within budget by the next reporting period.

Follow‑up Questions
  • What thresholds do you use to trigger corrective action?
  • How do you communicate EVM findings to non‑technical stakeholders?
Evaluation Criteria
  • Accurate definition of EVM terms
  • Linkage to cost control responsibilities
  • Practical example of impact
Red Flags to Avoid
  • Confusing EVM terminology
  • No link to quantity surveying duties
Answer Outline
  • Define BAC, PV, EV, AC
  • Calculate CPI and SPI
  • Use EVM reports for variance analysis
  • Recommend corrective actions
Tip
Stress how EVM supports accurate forecasting and variation management.
How would you approach the cost planning for a green building aiming for BREEAM Excellent certification?
Situation

The client commissioned a new office building with a target BREEAM Excellent rating, requiring early integration of sustainability costs.

Task

Develop a cost plan that captures both conventional construction costs and additional sustainability measures.

Action

I performed a life‑cycle cost analysis (LCCA) to compare upfront sustainable investments (e.g., high‑performance glazing, renewable energy systems) against long‑term operational savings. I allocated a dedicated sustainability budget, incorporated BREEAM credit cost estimates from the BREEAM Technical Manual, and applied risk contingencies for emerging technologies. I also coordinated with the sustainability consultant to validate assumptions.

Result

The final cost plan showed a 7% increase in capital cost but projected a 15% reduction in operating expenses over 20 years, meeting the client’s sustainability objectives while keeping the overall budget within the approved limit.

Follow‑up Questions
  • How do you track sustainability costs during construction?
  • What risk mitigation strategies do you apply for innovative materials?
Evaluation Criteria
  • Use of LCCA and BREEAM references
  • Balanced view of CAPEX vs OPEX
  • Stakeholder collaboration
Red Flags to Avoid
  • Ignoring long‑term operational savings
  • No mention of risk contingency
Answer Outline
  • Life‑cycle cost analysis
  • Allocate sustainability budget
  • Reference BREEAM credit cost guidance
  • Add risk contingency for new tech
  • Collaborate with sustainability consultants
Tip
Show familiarity with BREEAM credit categories and their cost implications.
What methods do you use to validate the accuracy of contractor’s interim payment applications?
Situation

During a multi‑phase commercial build, the contractor submitted monthly interim payment applications that needed verification.

Task

Ensure each application reflected actual work completed and complied with the contract terms.

Action

I performed a site measurement verification against the approved measurement schedule, cross‑checked quantities with the contractor’s take‑off, reviewed supporting documents (e.g., delivery dockets, labor records), and applied the contract’s measurement rules to calculate the payable amount. I also used a payment ledger to track cumulative payments against the total contract sum.

Result

The validation process identified a 2% over‑claim in month three, which was corrected before payment, safeguarding the client’s cash flow and maintaining contractual compliance.

Follow‑up Questions
  • How do you handle disputes arising from measurement differences?
  • What software assists you in tracking interim payments?
Evaluation Criteria
  • Systematic verification steps
  • Reference to contract terms
  • Proactive correction of errors
Red Flags to Avoid
  • Accepting applications without verification
  • Lack of documentation review
Answer Outline
  • Site measurement verification
  • Cross‑check with contractor’s take‑off
  • Review supporting documentation
  • Apply contract measurement rules
  • Update payment ledger and flag discrepancies
Tip
Mention any digital tools (e.g., Procore, Aconex) that streamline payment verification.
ATS Tips
  • Bill of Quantities
  • Cost Management
  • Contract Administration
  • RICS
  • Value Engineering
  • Earned Value Management
  • BREEAM
  • Provisional Sums
  • Measurement Take‑off
  • Variation Claims
Boost your Quantity Surveyor resume with our proven templates
Practice Pack
Timed Rounds: 30 minutes
Mix: Technical, Behavioral, Industry Practices

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