Basics of Project Management and Quantity Surveying

1 year ago

Ashley

21 minutes

Introduction

Project management in construction is the discipline of planning, organising, controlling, and executing a building project from conception through to completion — within defined constraints of scope, time, cost, quality, and risk. For quantity surveyors, understanding how project management works is not optional; it is fundamental. The QS operates as the financial controller of any construction project, and that role only makes sense within the broader framework of how projects are managed.

This article provides a comprehensive overview of project management principles and how quantity surveying interacts with each core knowledge area. It covers the main UK frameworks — APM Body of Knowledge, PRINCE2, RIBA Plan of Work, and NEC4 — and includes a full treatment of Earned Value Management with worked calculations. A realistic worked example follows a £5M commercial office from feasibility through to final account, showing precisely where and how the QS adds value at every stage.

The Iron Triangle and Beyond

The traditional project management framework is built on three interdependent constraints, often called the “iron triangle”:

Constraint	Definition	QS Relevance
Scope	What is built — the deliverable	Cost plan translates scope into £; BOQ quantifies scope for pricing
Time	The programme and schedule	Cost-loaded programme defines planned spend; valuations link to progress
Cost	The budget and expenditure	Core QS domain — cost planning, control, forecasting, final account

Modern construction project management extends this to include quality (specifications, performance standards, defect liability) and risk (probability and impact of adverse events). These five constraints are interdependent: a scope increase drives cost and time upward; time compression increases cost and quality risk; cost reduction forces scope reduction or quality compromise.

How Construction PM Differs from General PM

Construction projects carry unique complexity that distinguishes them from other industries. Projects are long-duration and capital-intensive (often 18+ months, £millions), geographically fixed, highly regulated (Building Regulations, CDM, statutory undertakers), and involve multiple integrated disciplines working in sequence and parallel. A mid-size project may have 30+ different specialist trades on site simultaneously.

Uncertainty is inherent: ground conditions may not match borehole data, weather delays external work, supply chains suffer lead-time volatility, and regulatory changes can shift compliance costs mid-project. Contractual complexity adds another layer — risk allocation varies significantly between traditional (design-bid-build), design-and-build, NEC collaborative, and two-stage open-book procurement routes.

Core PM Knowledge Areas and the QS Role

Scope Management

Scope defines what is included and excluded from the project. The QS translates scope into a hierarchical cost plan by element (structure, envelope, services, fit-out) and prepares the Bill of Quantities — the detailed quantification of scope items (m², m³, nr., linear m) priced by the contractor and used as the basis for valuations.

When scope changes, the QS provides the cost impact assessment: does the variation add or remove work? What is the contractor’s delay and disruption cost? Is this a client-initiated change (cost increase) or a defect (contractor’s cost)? For example, a client requests a balcony upgrade from standard railing to glass balustrade — the QS quantifies additional material (£12k), labour (£8k), and programme impact (5 days crane hold-up, £3k), producing a total variation instruction of £23k.

Time Management

Time management covers the programme — activity sequencing, duration estimation, critical path analysis, and progress monitoring. The critical path is the longest chain of dependent activities; any delay on it delays the entire project.

The QS’s role is to cost-load the programme, allocating cost to each time period based on planned activity. This becomes the Planned Value (PV) curve used in earned value management. Monthly interim valuations are linked to progress: if the contractor is behind programme, the QS can flag whether cost underruns reflect efficiency or slippage. When programmes slip, the QS quantifies the trade-off between acceleration costs (overtime, additional crews) and prolongation costs (extended site facilities, insurance, supervision).

Cost Management — The QS’s Core Domain

Cost management is where the QS takes centre stage. Key activities include cost estimating (±10–15% accuracy at feasibility, ±5–10% at scheme design), cost planning using NRM 1 methodology, cost control (monitoring actual spend against the cost plan), cost reporting (monthly to stakeholders), change cost assessment, and final account settlement.

The QS develops the cost plan early at scheme design stage, then updates it regularly through detailed design, tender, and post-contract. They monitor committed cost (orders placed and contractual commitments), track spend (invoices, certifications, claims), forecast cost at completion, and advise on savings opportunities through value engineering and procurement strategy. Material variances above 5% are typically flagged in monthly reporting.

Industry data shows the main drivers of cost overruns in construction: design changes account for approximately 30% of overruns, ground conditions and latent defects 20%, contractor productivity issues 20%, supply chain delays and inflation 15%, weather 10%, and other factors (permits, claims, disputes) 5%.

Quality Management

Quality encompasses planning, assurance, control, and defects management. Specifications may be prescriptive (defining materials and methods) or performance-based (defining outcomes, with the contractor choosing the method). Performance specifications often enable value engineering — the contractor can propose alternatives that meet performance requirements at lower cost.

The QS costs quality decisions. When the client requests an upgrade from standard aluminium window frames to triple-glazed passive house standard, the QS calculates the cost increase (material £28k, labour £12k, testing £5k = £45k total) and presents the trade-off against operating cost savings (lower energy bills, reduced running costs). During the defects period, the QS manages the financial provisions — retention (typically 5% of contract value) is held until the end of the defects liability period, subject to snagging completion.

Risk Management

Risk management follows a four-stage process: identification (brainstorm potential risks across geotechnical, weather, supply chain, regulatory, design, and contractor capability categories), analysis (probability and impact assessment), response (mitigate, avoid, accept, or transfer), and monitoring (track the risk register and escalate emerging risks).

The QS maintains the financial quantification of each risk using the expected value method: probability multiplied by impact. For example, a structural steel supply delay with 35% probability and £50k impact has an expected value of £17.5k. This calibrates the total contingency allocation.

Contingency levels follow industry practice: 10–15% at feasibility (high uncertainty), 5–8% at detailed design, and 3–5% post-tender. The QS advises on drawdown governance — who authorises contingency use, what triggers drawdown, and how much is allocated to each risk category.

Procurement Management

The QS plays a central role in procurement, from strategy through to contract award. The main procurement routes in UK construction are:

Route	Description	QS Role
Traditional (Design-Bid-Build)	Design developed to 80%+, competitive tendering on fixed scope/BOQ	Prepare tender documents, BOQ, evaluate tenders, cost control
Design-and-Build	Contractor completes design and builds; takes design + execution risk	Employer’s cost consultant; advise on cost of design changes
NEC Collaborative	Shared risk/reward (pain/gain); early contractor involvement	Cost monitoring, target cost management, early warning of overruns
Two-Stage Open Book	Stage 1: tender for prelims + OH&P %; Stage 2: firm up cost	Transparency in cost build-up, identifying savings opportunities

During tendering, the QS prepares the tender package (specifications, drawings, BOQ, contract conditions, insurance and bonding requirements), manages enquiries, evaluates responses on price, methodology, contractor capability, and risk allocation, then provides a recommendation. Evaluation considers whole-life cost, not just capital cost.

Stakeholder Management and Communication

The QS communicates financial information differently to each stakeholder. To the client: “Current cost forecast £5.18M (£180k overspend), primarily due to ground conditions (£120k) and client changes (£60k). Recommend release of £80k contingency.” To the contractor: “September valuation £1.42M certified — 48% of contract against a programme target of 52%.” To the design team: “Latest specification option adds £34k; recommend detailed thermal modelling to justify the whole-life cost benefit before committing.”

A standard monthly cost report includes an executive summary (traffic-light status, headline metrics), cost vs. budget summary (cost plan, committed cost, spend to date, forecast final cost, variance), committed cost breakdown by element, financial KPIs (CPI, SPI, contingency position), variations and claims summary, cash flow forecast, risk register update, and narrative commentary explaining variances and decisions needed.

UK PM Frameworks and the QS

APM Body of Knowledge (7th Edition, 2019)

The APM Body of Knowledge is the UK’s leading project management standard, published by the Association for Project Management. The 7th edition organises knowledge across eight competency areas — People, Processes, Products, Practice, Professionalism, and core cross-cutting concepts (value and benefits realisation, commercial management, governance).

The QS maps directly to several APM competencies: Processes: Planning (cost planning, cost breakdown structures), Processes: Control (cost monitoring, variance analysis, forecasting), Processes: Change (variation procedure, change cost assessment, claims management), Products: Scope (translating scope into cost plans and BOQs), Products: Quality (costing quality specifications, VE trade-offs), Practice: Delivery (valuations, cost certification, contractor payment), and Commercial management (procurement, tender analysis, contract cost management).

PRINCE2 (Projects in Controlled Environments)

PRINCE2 is a structured stage-based governance framework, widely adopted in UK public sector projects. Its seven processes run from Starting up a Project through to Closing a Project, with the business case at the heart of every decision.

The QS supports PRINCE2 in several ways. For the business case, the QS provides capital cost and operating cost inputs: “New office capital cost £5M, annual operating cost £280k vs. current leased space £350k/year — breakeven 2.5 years, NPV over 10 years = £2.1M at 5% discount rate.” At stage gates, the QS provides the cost position: “End of design stage — cost plan £5.0M vs. budget £5.0M. Green light for construction procurement.” For the Change Authority, the QS quantifies each change request before approval. And for exception management, the QS raises cost exceptions with options: fund from contingency, reduce scope, or extend programme.

RIBA Plan of Work 2020

The RIBA Plan of Work defines the design and construction process framework that most UK architects and QSs work within. Its eight stages (0–7) structure how cost planning evolves alongside design development:

RIBA Stage	Cost Plan Accuracy	QS Input
0 — Strategic Definition	±20%	Feasibility estimate, whole-life cost considerations
1 — Preparation & Brief	±15%	Outline cost plan, cost limits by element, preliminary contingency
2 — Concept Design	±12%	Cost plan for each option, whole-life cost analysis, VE ideas
3 — Spatial Coordination	±8–10%	Updated cost plan by element and trade, design cost trade-offs
4 — Technical Design	±5–8%	Elemental cost plan reconciliation with specifications
5 — Manufacturing & Delivery	±2–5%	Contract sum agreement, interim valuations, change control
6 — Handover & Closeout	Final	Snagging account, defects reserve, final account settlement
7 — In-Use	Actual	Final cost reconciliation, whole-life cost update with actual data

The QS acts as cost gatekeeper between stages: “Stage 3 design is £120k over cost plan — recommend value engineering in fit-out or contingency drawdown before approving stage advance.”

NEC4 Project Management Approach

The NEC4 contract suite emphasises collaboration, early contractor involvement, and shared risk/reward. Under Option C (target cost), the client sets a target — if the contractor delivers below target, savings are shared (e.g. 50:50). Compensation events handle changes, and Early Warnings encourage proactive risk escalation rather than retrospective claims.

The QS’s role under NEC is distinctive: during the early contractor involvement phase, the QS develops the target cost jointly with the contractor, agreeing the cost breakdown (materials, labour, plant, overhead, profit). Post-contract, the QS monitors actual cost against target, assesses compensation events, and forecasts shared savings or pain. The transparency of NEC’s defined cost model — with overhead and profit shown separately — gives the QS clear visibility of cost drivers.

Earned Value Management — Full Treatment

What Is EVM?

Earned Value Management (EVM) integrates scope, schedule, and cost data to measure project performance objectively. It answers three questions: how much work was planned versus actual (scope/schedule performance), how much has been spent (cost/budget), and what will the final cost and schedule be (forecast to completion). EVM provides early warning of overruns — identifying problems at months 4–6, not month 16 when it is too late for corrective action.

Core Metrics

EVM is built on three core measurements:

Metric	Also Known As	Definition
Planned Value (PV)	BCWS	Cost allocated to work scheduled to be completed by this date — derived from the cost-loaded programme
Earned Value (EV)	BCWP	Budgeted cost of work actually completed — measured scope valued at original budgeted cost (not actual cost)
Actual Cost (AC)	ACWP	Real money spent to date — invoices paid, certified valuations, committed costs

The key distinction is that EV is valued at planned cost, not actual cost. This removes inflation and material waste from the schedule metric, giving a clean measure of progress.

Performance Indices and Variances

Schedule Performance Index (SPI) = EV ÷ PV — measures schedule efficiency. An SPI of 1.0 means on schedule; below 1.0 means behind schedule (less work completed than planned); above 1.0 means ahead.

Cost Performance Index (CPI) = EV ÷ AC — measures cost efficiency. A CPI of 1.0 means on budget; below 1.0 means over budget (spending more per unit of work); above 1.0 means under budget.

Schedule Variance (SV) = EV − PV — the absolute difference between earned and planned value. A negative SV indicates schedule slippage in cost terms.

Cost Variance (CV) = EV − AC — the absolute difference between earned value and actual cost. A negative CV indicates overspend.

Forecasting Metrics

Estimate at Completion (EAC) = Budget ÷ CPI — forecasts the total project cost if current cost performance continues.

Variance at Completion (VAC) = Budget − EAC — forecasts total overspend or underspend at project end.

Estimate to Complete (ETC) = EAC − AC — how much more needs to be spent to finish.

To-Complete Performance Index (TCPI) = (Budget − EV) ÷ (Budget − AC) — the cost performance needed on remaining work to hit the original budget. A TCPI significantly above 1.0 signals that recovery to budget is unrealistic.

Worked EVM Calculation

Consider a Grade A commercial office in Central London — 15,000 m² net, 18-storey steel frame, £5.0M budget, 18-month programme under JCT SBC/Q. At Month 8 (mid-construction), the QS performs an EVM review.

Planned Value at Month 8: The cost-loaded programme shows cumulative planned spend of £2,500k (50% of budget) by Month 8, covering design and procurement (£420k), site preparation (£280k), and structural frame works through to Month 8 (£1,800k).

Earned Value at Month 8: The valuation and progress survey show:

Element	Budget	% Complete	Earned Value
Design & fees	£420k	100%	£420k
Groundworks	£180k	100%	£180k
Structural frame & concrete	£520k	85%	£442k
Mechanical installation	£480k	40%	£192k
Electrical installation	£360k	35%	£126k
Façade / curtain wall	£280k	10%	£28k
Fit-out	£520k	0%	£0k
Other (testing, snagging)	£640k	0%	£0k
Total			£1,388k

Actual Cost at Month 8: £1,840k (paid invoices £1,420k + retention held £180k + committed material orders £240k).

Performance Indices:

Metric	Calculation	Result	Interpretation
SPI	£1,388k ÷ £2,500k	0.555	Only 55.5% of planned progress achieved — 44.5% behind schedule
CPI	£1,388k ÷ £1,840k	0.754	Getting £0.754 of value per £1 spent — 24.6% cost overrun
SV	£1,388k − £2,500k	−£1,112k	£1,112k behind in earned value terms
CV	£1,388k − £1,840k	−£452k	Work completed cost £452k more than budgeted

Forecasts:

Metric	Calculation	Result	Interpretation
EAC	£5,000k ÷ 0.754	£6,631k	Forecast final cost if current performance continues
VAC	£5,000k − £6,631k	−£1,631k	Forecast overspend of £1,631k (33% overrun)
ETC	£6,631k − £1,840k	£4,791k	Remaining spend needed (vs. £3,160k originally budgeted)
TCPI	(£5,000k − £1,388k) ÷ (£5,000k − £1,840k)	1.143	Need 114.3% cost efficiency on remaining work to hit budget — unrealistic

Root causes: Structural frame delays (concrete delivery issues, slow formwork removal, additional piling for ground conditions — 5 weeks lost). Mechanical rough-in delayed waiting on structural completion plus lower subcontractor productivity (3 weeks). Direct cost overruns: additional piling +£180k, mechanical overtime +£120k, material inflation (steel and copper) +£110k, concrete rework +£42k = £452k total, matching the cost variance exactly.

Corrective actions recommended by QS: (1) Accelerate structural completion — add crew and optimise logistics at £120k cost vs. £300k prolongation saving = net benefit £180k. (2) Value engineer remaining fit-out to target £200k saving. (3) Negotiate with concrete supplier and pursue delay claim against mechanical subcontractor. (4) Request client funding of £400–600k to cover contingency shortfall. With corrective actions: revised EAC £5,600k (12% overspend). Without: EAC £6,631k (33% overspend).

Worked Example — QS Interaction Across the Project Lifecycle

Project Overview

Item	Detail
Project	New Grade A Commercial Office Building
Client	Property investor/developer
Location	Canary Wharf, London
Scope	18-storey steel frame, 15,000 m² net; ground floor retail/café (2,500 m²)
Budget	£5.0M construction cost (£6.2M total inc. fees, land, client’s costs)
Programme	18 months construction
Contract	JCT Standard Building Contract with Quantities (SBC/Q)
Procurement	Traditional (design-bid-build), competitive tendering to 3 contractors

Phase 1: Pre-Contract — Feasibility and Cost Planning

The QS begins with a feasibility estimate. The client asks whether the office can be built for £750k. The QS advises that London Grade A offices cost £250–350/m² all-in, so 15,000 m² requires £4.5–5.5M. A formal feasibility estimate is prepared at £5.0M base estimate, ±20% accuracy range (£4.0–6.0M).

A whole-life cost appraisal follows: capital cost £5.0M, annual operating cost £180k, annual rental income at £450/m² market rate = £6.75M. Payback period is under one year; NPV over 20 years at 7% discount rate is £38.2M — a strong investment case.

The QS prepares an initial risk register with three key risks: ground conditions (Canary Wharf has variable reclaimed land — probability 50%, impact £150k, contingency £75k), design changes (probability 40%, impact £100k per change, contingency £150k), and supply chain delays (probability 45%, impact £120k, contingency £55k). Total contingency allocation: £280k (5.6% of budget).

The QS recommends a traditional procurement route (design-bid-build) — competitive tendering gives cost certainty, and with design already 50% complete, this is the best-value approach.

Phase 1 Continued: Detailed Cost Plan

As design develops, the QS refines the cost plan:

Element	Cost	% of Total
Substructure (piling, raft, ground beams)	£320k	6.4%
Frame (steel, columns, connections)	£580k	11.6%
Concrete floors & decking	£240k	4.8%
Roof (structure + finishes)	£180k	3.6%
External walls (curtain wall system)	£420k	8.4%
Windows & doors	£140k	2.8%
Mechanical (HVAC, plumbing, gas)	£520k	10.4%
Electrical (power, lighting, fire, IT)	£360k	7.2%
Internal partitions	£280k	5.6%
Flooring (raised floors, final surface)	£240k	4.8%
Ceilings & wall finishes	£180k	3.6%
Doors, frames, fittings	£120k	2.4%
Site set-up, facilities, insurance, plant	£280k	5.6%
Contractor management & supervision	£240k	4.8%
Contingency (5%)	£250k	5.0%
Total	£5,000k	100%

The architect proposes upgrading the façade to high-spec triple-glazed units. The QS costs the upgrade at +£84k, with a whole-life cost benefit of −£8k/year in energy savings (NPV over 20 years = −£65k; cost recovery in approximately 10 years). The client approves — aesthetics matter for Grade A market positioning.

Phase 2: Tendering and Contract Award

The QS prepares the tender package and issues it to three pre-qualified contractors. Responses are evaluated on price, programme, risk profile, and whole-life cost:

Contractor	Price	Programme	Risk	Whole-Life Assessment
A	£4.92M	18 months	Medium	£4.92M — good value, known contractor
B	£4.68M	18 months	High (tight margin suggests claims risk)	£4.83M (inc. £150k risk premium)
C	£5.15M	17 months	Low	£5.07M (less £80k early completion saving)

The QS recommends Contractor A: “Price £4.92M is £80k below cost plan, meeting budget. Proven capability and track record. Recommend acceptance.” The client agrees. Following negotiation, the contract is signed at £4.75M, with 5% retention (£237k) and a 12-month defects liability period.

Phase 3: Construction — Cost Control in Action

At the pre-construction meeting, the QS establishes the cost control framework: weekly site meetings reviewing progress and costs, monthly QS valuations, monthly cost reports to client, formal change control (any variation requires QS cost assessment → PM approval → written instruction), and claims notification within 14 days.

The cost baseline is confirmed: £4.75M contract sum + £250k contingency = £5.0M total budget.

Mid-point review (Month 8 of construction): The QS certifies the monthly valuation based on BOQ rates linked to measured progress. Cumulative certified value reaches £3,240k. The cost report shows committed cost of £4,680k (98% of contract), with a forecast final cost of £4,860k — a slight overspend driven by MEP subcontractor delays extending preliminary costs.

Variation example — Client-initiated (Month 12): The client requests an upgrade to the ground floor lobby lighting from standard LED downlights to high-end bespoke luminaires. The QS assesses: material uplift +£24k, additional installation labour +£6k, programme impact (one-week fit-out delay) +£8k prolongation. Total variation: £38k. The client approves — this is a brand-defining element of the building.

Claim example — Unforeseen conditions (Month 7): During excavation, the contractor discovers contaminated soil not revealed by the original borehole investigation. The contractor claims £180k remediation cost plus £24k delay costs (3 weeks at £8k/week = £204k total). The QS investigates: the borehole report noted “potential for historical contamination” but the client did not commission a Phase 2 investigation. The QS negotiates: “We accept £160k for remediation and £18k for delay = £178k.” The contractor settles at £170k. This is drawn from contingency (remaining: £80k of original £250k).

Phase 4: Post-Contract — Final Account and Close-Out

At practical completion, the final cost position is:

Item	Cost
Contract sum (agreed)	£4,750k
Approved variations (net)	+£208k
— Client changes (lighting £38k + other £80k)	+£118k
— Contaminated ground remediation	+£170k
— Scope deletions	−£80k
Final account	£4,958k
Contingency remaining	£42k
Total cost vs. £5.0M budget	−£42k (underspend)

The QS prepares the final account, manages the defects liability period (12 months), and releases retention (£237k) upon satisfactory completion of snagging items. A lessons-learned review captures what worked well (monthly valuations, change control discipline) and what could improve (more detailed ground investigation upfront, earlier contractor engagement on MEP coordination).

The whole-life cost appraisal is updated with actuals: capital cost £4,958k (vs. forecast £5,000k = £42k saving), first-year operating cost £185k (vs. forecast £180k = £5k variance). NPV over 20 years revised to £38.0M — confirming the investment performed as expected.

The QS as Financial Controller

The QS’s role as financial controller is distinct from but integral to the PM’s overall management responsibility:

Aspect	Project Manager	Quantity Surveyor
Scope	Delivers all project objectives (scope, time, cost, quality, risk)	Financial management within the scope delivered by PM
Cost focus	Cost control is one of several responsibilities	Cost is the primary focus
Reporting	Overall project status to client and stakeholders	Cost reports to client, PM, design team, contractor
Authority	Approves changes, directs teams, resolves disputes	Advises on cost — QS does not approve changes (PM does)
Dependency	Depends on QS for cost intelligence	Provides cost data to PM for decision-making
Accountability	Accountable for overall delivery	Accountable for accuracy of cost advice

Without QS cost monitoring, overruns are discovered too late — at final account, not during the project when corrective action is possible. With QS cost control, variances are identified early (months 4–6), enabling course correction. The QS is the PM’s “financial eyes and ears”: “Contingency is 80% spent — if further risks materialise, we will exceed budget. Recommend value engineering or additional client funding.”

The QS’s professional duty under the RICS Code of Conduct requires honesty, integrity, independence, and competent advice — even when that advice is unwelcome. The QS must tell the client that their budget is insufficient, tell the contractor that their claim is inflated, and tell the PM that the programme delay will cost £X in prolongation whether or not anyone wants to hear it.

Practical Tips for QS Professionals

Embed cost control from day one. Establish the cost baseline, cost-loaded programme, and reporting framework at the pre-construction meeting — not midway through the project. Early discipline prevents late surprises.

Cost-load the programme. Link the cost plan to the construction programme so that planned spend by month is clearly defined. This is the foundation for earned value management and meaningful progress reporting.

Maintain a live risk register. Quantify every identified risk (probability × impact = expected value) and track contingency drawdown rigorously. Report the contingency position monthly alongside the cost report.

Use EVM as an early warning system. Calculate CPI and SPI monthly from Month 3 onward. An SPI below 0.90 or CPI below 0.90 warrants immediate investigation and corrective action planning. Do not wait until the problem is obvious to the naked eye.

Report to each audience differently. The client needs headline cost vs. budget and a clear recommendation. The PM needs variance detail and decision options. The contractor needs valuation clarity and change procedure. The funder needs quarterly financial health and drawdown schedules. Tailor format and language accordingly.

Enforce change control. No variation should proceed without QS cost assessment and PM written approval. Scope creep — design team refinements, client “nice-to-haves,” contractor reinterpretations — is the single largest driver of cost overruns. A disciplined change control gate prevents it.

Know your frameworks. Understand how APM, PRINCE2, RIBA, and NEC structure the project, and adapt your cost management approach accordingly. Under PRINCE2, you support the business case and stage gates. Under RIBA, your cost plan evolves with each design stage. Under NEC, you monitor target cost and shared savings. Context determines method.