DOCS

Question 1

Why did the cost increase between Stage 2 and Stage 3 on your High Wycombe project?

Answer 1

The increase was primarily driven by design development as the scheme progressed from concept to coordinated design. At Stage 2, the cost plan was based on outline assumptions for structure, MEP services and external works. As the design developed at Stage 3, more information became available, including refined structural requirements and building services strategy, which increased the cost. I monitored this through cost plan updates and change tracking, and advised the client on cost drivers and potential value engineering options to maintain alignment with the budget.

Question 2

How did you identify the key cost drivers in the design change?

Answer 2

I undertook a cost comparison between the Stage 2 and Stage 3 cost plans. This involved identifying package-level cost movements, particularly within structure, building services and finishes. I also reviewed design drawings and specifications to understand the reason for the changes. The main cost drivers were then discussed with the design team during value engineering workshops to identify potential alternatives.

Question 3

What options did you give the client when the Dulwich project went over budget?

Answer 3

I advised the client on three main options: Value engineering – identifying alternative materials or design adjustments that maintained performance but reduced cost. Scope adjustment – reviewing elements of the project that could be removed or simplified without affecting core project objectives. Budget increase – where changes were essential to meet project requirements. I supported this by providing cost comparisons and outlining the cost, programme and quality implications of each option, enabling the client to make an informed decision.

Question 4

What is the difference between value engineering and cost cutting?

Answer 4

Value engineering focuses on improving value by considering cost, quality and function together. It aims to achieve the required performance at the lowest whole-life cost. Cost cutting simply reduces cost, often without considering performance or long-term implications. For example, changing a specification to a lower-quality product purely to save money would be cost cutting, whereas selecting an alternative material with equivalent performance but lower cost would be value engineering.

Question 5

How accurate should a cost plan be at Stage 3 vs Stage 4?

Answer 5

Typical accuracy ranges are: Stage 3 (Developed Design): ±10–15% Stage 4 (Technical Design / Pre-Tender): ±5–10%. Accuracy improves as design information becomes more defined and risks reduce.

Question 6

Why was two-stage procurement appropriate for your project?

Answer 6

Two-stage procurement was appropriate because the project had programme constraints, including a fixed completion date linked to the school opening. Statutory approvals (Section 278) were still progressing and the design was not fully complete. Two-stage procurement allowed early contractor involvement through a PCSA, enabling buildability input and programme planning while the design was finalised. This reduced delivery risk while still allowing the client to retain design control through a traditional contract structure.

Question 7

What are the risks of two-stage procurement compared to single stage?

Answer 7

Key risks include: Reduced price competition at second stage, as the contractor is already engaged. The contractor may gain greater commercial leverage during final negotiations. There is also a risk of cost increases if packages are not sufficiently defined. To mitigate this, we used: open-book pricing, benchmarking, market testing of key packages.

Question 8

What is sectional completion and why was it important for Dulwich School?

Answer 8

Sectional completion allows different parts of the works to be completed and handed over at different times. For the Dulwich project, this was important because the school needed specific areas completed before the academic term. Sectional completion allowed phased occupation, reducing disruption to school operations. It also enabled liquidated damages to apply separately to each section, providing programme protection for the client.

Question 9

What would happen if you certified an interim payment incorrectly?

Answer 9

If an interim payment is certified incorrectly: The employer could overpay or underpay the contractor. This may lead to disputes or payment notices being challenged under the Housing Grants, Construction and Regeneration Act. The certifier could also face professional liability if negligence is proven. To mitigate this risk, I ensure that payment assessments are based on: site inspections, progress evidence, valuation of completed works.

Question 10

How did you prepare for the final account negotiation at Harrow?

Answer 10

Preparation involved: Reviewing the contract sum analysis and variations. Checking that all instructions and changes had been properly valued and agreed where possible. Reviewing supporting documentation from the contractor, including substantiation for variations. Identifying any areas of disagreement or commercial risk before the meeting. This allowed me to enter negotiations with a clear understanding of the employer’s position.

Question 11

Why was Douglas Fir selected instead of oak for the structural frame?

Answer 11

Douglas Fir was selected because: It has a high strength-to-weight ratio, making it suitable for structural applications. It is more readily available and cost-effective than oak. It also has good dimensional stability, reducing the risk of excessive movement or cracking.

Question 12

What are the structural advantages of glulam timber?

Answer 12

Glulam offers several advantages: High structural strength due to laminated layers. Ability to form long spans and curved shapes. Reduced defects compared to solid timber, as imperfections can be removed during manufacture. Improved dimensional stability.

Question 13

Why was vinyl flooring better than resin from a construction perspective?

Answer 13

Vinyl flooring was preferred because: It has a simpler installation process. It requires less specialist installation compared to resin systems. It has lower installation cost and shorter programme impact. It also provides good durability and ease of maintenance for school environments.

Question 14

Key differences between pad foundations and piled foundations

Answer 14

Pad foundations: Used where ground bearing capacity is sufficient. Spread loads from columns into the soil. Typically simpler and cheaper to construct. Piled foundations: Used where ground conditions are weak or loads are high. Transfer loads to deeper stable strata. More complex and expensive.

Question 15

How does timber behave in fire?

Answer 15

Timber behaves differently to steel: Timber chars on the surface when exposed to fire. The char layer acts as insulation, protecting the inner structural core. This allows the remaining timber section to retain structural capacity for a defined period.

Question 16

How did you ensure the tender process was fair?

Answer 16

We issued identical tender documentation to all contractors. All clarification questions were shared with all tenderers through a formal clarification process. Tender submissions were evaluated against predefined criteria, including price, programme and quality.

Question 17

How did you analyse the tender returns?

Answer 17

I reviewed: Overall tender price, Breakdown of contractor preliminaries, programme duration, qualifications or exclusions, compliance with tender documentation. I also undertook benchmarking against the pre-tender estimate.

Question 18

How did the contractor’s programme influence your recommendation?

Answer 18

The programme was important because the project had a fixed completion date linked to the school term. I reviewed: construction duration, key milestones, critical path activities. The contractor selected demonstrated a realistic programme aligned with the project constraints.

Question 19

Why might a client choose single-stage tendering instead?

Answer 19

Single-stage may be appropriate when: The design is fully developed. There are no major unknown risks. The client wants maximum price competition at tender stage.

Question 20

What happens if contingency is fully used during construction?

Answer 20

If contingency is fully used: The project may exceed the approved budget. The client may need to identify additional funding or implement value engineering measures. I would advise the client early through cost reporting and forecasting to avoid unexpected overruns.

Question 21

How do you advise a client when additional scope is introduced?

Answer 21

I would advise the client by: Providing cost implications of the change. Explaining programme and risk impacts. Confirming whether the change can be accommodated within existing contingency or budget. This ensures the client can make an informed decision before instructing the change.

Question 22

Why should a contractor not be paid for materials simply on site?

Answer 22

Contractors are typically paid for work properly executed. Materials on site may not yet: be installed, be protected, or even belong to the employer. Paying for them early increases the risk if the contractor becomes insolvent. However, some contracts allow materials on site to be valued if ownership transfers to the employer.

Question 23

How did you challenge the contractor’s claim for leadwork?

Answer 23

I reviewed: measured quantities against drawings, rates in the contract sum analysis, supporting substantiation from the contractor. Where discrepancies were identified, I requested further evidence and negotiated an agreed valuation.

Question 24

How did you quantify risks using Expected Monetary Value?

Answer 24

Expected Monetary Value is calculated as: Risk probability × financial impact. For example: 20% probability of a £100k cost impact EMV = £20k risk allowance. This helps inform the risk allowance within the cost plan.

Question 25

Example risk

Answer 25

Example risk from the project: Risk: Delay in Section 278 highway approval. Allocation: Statutory approval risk remained with the client, as it relates to third-party approvals. Mitigation: Early engagement with the local highway authority. Contractor involvement during PCSA to coordinate construction sequencing. Allowance: A risk allowance was included in the cost plan to account for potential design adjustments or programme implications.

Question 26

On your **High Wycombe project**, the cost increased between **RIBA Stage 2 and Stage 3**. Why did this happen and how did you manage it?

Answer 26

• Cost increase was primarily due to **design development as the project progressed from concept to developed design** • At **Stage 2**, cost plan was based on **outline assumptions for structure, MEP and external works** • At **Stage 3**, design information became more defined, including **structural requirements, services strategy and specification details** • I undertook a **Stage 2 vs Stage 3 cost comparison** to identify cost movements by element • Key cost drivers were communicated to the client through **cost reporting** • I worked with the design team to identify **value engineering opportunities to maintain alignment with the project budget**

Question 27

On your project, how did you **identify the key cost drivers** when the design developed and costs increased?

Answer 27

• I compared **Stage 2 and Stage 3 elemental cost plans** • Identified **cost movements by building element** (structure, services, finishes etc) • Reviewed **updated drawings and specifications** to understand the design changes • Discussed changes with the **design team** to confirm the reasons for cost increases • Presented findings to the client and explored **value engineering options**

Question 28

On the **Dulwich project**, the scheme exceeded the client’s budget. What options did you provide to the client?

Answer 28

• Identified **value engineering options** to reduce cost while maintaining performance • Reviewed **scope adjustments** where elements could be simplified or removed • Presented the **option of increasing the project budget** if changes were essential • Provided **cost comparisons and implications for programme and quality** • Enabled the client to make an **informed decision aligned with their key drivers**

Question 29

What is the difference between **value engineering and cost cutting**, and how did this apply on your project?

Answer 29

• **Value engineering** focuses on achieving the **required function and performance at the lowest cost** • Considers **cost, quality and performance together** • Typically undertaken during **early design stages (Stage 2–3)** • **Cost cutting** simply reduces cost without considering long-term performance or value Example from project: • Vinyl flooring selected instead of resin flooring • Maintained **durability and functional performance** • Reduced **installation complexity and cost**

Question 30

What is the typical **accuracy of cost plans at RIBA Stage 3 and Stage 4**?

Answer 30

Stage 3 – Developed Design • Approximate accuracy **±10–15%** Stage 4 – Technical Design / Pre-Tender • Approximate accuracy **±5–10%** Accuracy improves because: • Design becomes more detailed • Quantities and specifications become more defined • Risks are better understood

Question 31

On your project you adopted **two-stage procurement with a PCSA**. Why was this route appropriate?

Answer 31

• Project had **programme constraints linked to school opening dates** • **Section 278 statutory approvals** were still ongoing • Design was not sufficiently developed for single-stage procurement • Two-stage procurement allowed **early contractor involvement through a PCSA** • Contractor provided **buildability advice and programme input while design progressed** • Client retained **design control through a traditional contract structure**

Question 32

What are the **risks of two-stage procurement compared to single-stage tendering**?

Answer 32

• Reduced **price competition at second stage** • Contractor may gain **greater commercial leverage during negotiations** • Potential risk of **cost increases if packages are not clearly defined** Mitigation measures include: • **Open book pricing** • **Benchmarking against cost plan** • **Market testing of subcontract packages**

Question 33

What is **sectional completion**, and why was it important for the **Dulwich School project**?

Answer 33

• Sectional completion allows **different parts of the works to be completed and handed over at different times** Benefits on the project: • School required **certain areas operational before the academic term** • Enabled **phased occupation of the building** • Allowed **liquidated damages to apply to individual sections**

Question 34

What would happen if a **quantity surveyor certified an interim payment incorrectly**?

Answer 34

• Employer may **overpay or underpay the contractor** • Could result in **payment disputes under the Housing Grants Construction and Regeneration Act 1996** • May lead to **adjudication if the contractor disputes the valuation** • QS could face **professional liability if negligence is proven** Mitigation: • Undertake **site inspections** • Review **contract sum analysis and progress evidence**

Question 35

How did you **prepare for the final account negotiation on the Harrow project**?

Answer 35

• Reviewed **contract sum analysis and variation records** • Checked **all instructions were properly valued** • Reviewed **contractor substantiation for variations** • Identified **areas of disagreement before negotiation** Purpose: • Enter negotiation with **clear understanding of employer position**

Question 36

If **contingency is fully used during construction**, what advice should a quantity surveyor give the client?

Answer 36

• Inform the client immediately through **cost reporting** • Review **remaining project risks** • Identify **cost mitigation or value engineering opportunities** • Confirm whether **additional funding may be required** Purpose: • Ensure client can make **informed financial decisions**

Question 37

During construction, the client introduces **additional scope changes**. How should a quantity surveyor advise the client?

Answer 37

• Assess **cost implications of the change** • Identify **programme and risk impacts** • Confirm whether the change can be accommodated within **existing contingency** • Advise the client before any **formal instruction is issued** Purpose: • Maintain **budget control and informed decision making**

Question 38

On your project there was a **risk relating to Section 278 highway approval**. How was this risk allocated and managed?

Answer 38

Risk • Delay or design changes due to **highway authority approval** Risk allocation • Statutory approval risk retained by **the client** Mitigation • Early engagement with **local highway authority** • Contractor input during **PCSA period** Cost allowance • Risk allowance included within **cost plan contingency**

Question 39

How can **Expected Monetary Value (EMV)** be used to quantify project risk?

Answer 39

Formula • **Probability of risk occurring × financial impact** Example • 20% probability of £100k cost impact • EMV = **£20k risk allowance** Purpose • Helps determine **appropriate contingency allowance**