PCEM Section 4

The PCEM Cost Estimating Process

A comprehensive 15-step framework for developing accurate, defensible cost estimates for Queensland infrastructure projects

PCEM 9th Edition Chapter 03 of 7
00Overview 01Introduction 02Policy & Standards 03Estimating Process 04Phase Estimates 05Estimate Structure 06Risk & Contingency 07Methods & Tools
Process Overview

Overview of the Estimating Process

The PCEM defines a systematic 15-step process for developing cost estimates, ensuring consistency, accuracy, and defensibility across all Queensland infrastructure projects.

Following this structured process helps estimators:

  • Capture all project costs comprehensively
  • Apply appropriate estimating methods based on available information
  • Manage uncertainty through risk assessment and contingency
  • Validate estimates through peer review and reality checks
  • Document assumptions and methodologies for transparency
  • Counteract optimism bias inherent in project planning

The process is designed to be scalable - simple projects may require less detail at certain steps, while complex mega-projects demand rigorous application of every element. Regardless of project scale, all 15 steps must be considered and documented.

Key Principle

The estimating process is iterative, not linear. As new information becomes available throughout the project lifecycle, estimates must be revisited and refined. Early estimates are based on limited information and require larger contingencies; later estimates benefit from detailed design and market engagement.

15 Process Steps
4 Process Phases
P50/P90 Confidence Levels
CE1 Pre-Qualified
Step-by-Step Framework

The 15 Steps of PCEM Cost Estimating

Each step builds upon the previous one, creating a comprehensive foundation for accurate cost estimation.

Phase 1
Foundation
Steps 1–4
1

Step 1: Establish Project Scope

The foundation of any estimate is a clear understanding of what is to be delivered. This step involves defining project boundaries, deliverables, constraints, and exclusions. The estimator must identify what is included in the estimate and what is not, documenting any assumptions about scope interpretation.

Key Activities

Review project brief, identify stakeholder requirements, define geographic and temporal boundaries, clarify performance specifications, document scope assumptions and exclusions.

2

Step 2: Collect Available Project Information

Gather all relevant documentation that will inform the estimate. This includes design drawings, specifications, geotechnical reports, environmental assessments, traffic studies, utility plans, and any previous estimates or feasibility studies. The quality and completeness of information directly impacts estimate accuracy.

Key Activities

Collect design documentation, review previous estimates, obtain site investigation reports, gather stakeholder requirements, identify design gaps, document information quality and completeness.

3

Step 3: Become Familiar with the Project Site

Direct site knowledge is invaluable for identifying cost drivers and constraints that may not be apparent from documentation alone. Site visits reveal access challenges, existing conditions, environmental sensitivities, utility conflicts, and constructability issues that significantly impact costs.

Key Activities

Conduct site inspections, assess site access and logistics, identify existing infrastructure, evaluate environmental constraints, understand local conditions, photograph key features, document site-specific cost impacts.

4

Step 4: Collate Estimating Information

Organize and structure all information gathered in previous steps into a format suitable for estimating. This includes developing quantity take-offs from drawings, extracting unit rates from historical data, identifying applicable standards and specifications, and preparing the estimating framework aligned with the Work Breakdown Structure (WBS).

Key Activities

Develop quantity take-offs, organize information by WBS, identify applicable rates and benchmarks, prepare estimating templates, document measurement methods and assumptions.

Phase 2
Development
Steps 5–8
5

Step 5: Determine Work Item Types

Classify each cost element according to how it will be estimated and managed. Work items fall into four categories: fixed quantity items (known scope and quantity), measured items (quantity estimated from design), provisional items (allowances for anticipated but undefined work), and lump sum items (complex activities priced as a package).

Key Activities

Classify each WBS element by item type, define measurement units, establish basis for provisional allowances, identify lump sum packages, document classification rationale.

6

Step 6: Understand Historical Data

Leverage Queensland's SmartCost database and other historical project data to inform rate development. Historical data provides benchmarks for similar work, but must be adjusted for project-specific conditions, location factors, market conditions, and scope differences. Understanding the context of historical data is as important as the data itself.

Key Activities

Access SmartCost database, identify comparable projects, extract relevant unit rates, adjust for location and timing, validate data applicability, document data sources and adjustments.

7

Step 7: Develop Base Estimate

Calculate the base construction cost using appropriate estimating methods. Four primary methods are available: global estimates (top-down, high-level rates), unit rate estimates (quantities multiplied by unit rates), first principles estimates (detailed resource-based buildup), and hybrid approaches combining multiple methods. Method selection depends on design maturity and required accuracy.

Key Activities

Select appropriate estimating method(s), calculate quantities, apply unit rates or develop resource buildups, price preliminaries and indirects, document all calculations and assumptions, prepare detailed estimate breakdown.

8

Step 8: Undertake Reality Checks

Validate the base estimate against independent benchmarks and sanity checks. Compare the estimate to similar completed projects, industry benchmarks, parametric checks, and alternative calculation methods. Significant variances require investigation and explanation. This step catches errors and identifies items requiring refinement.

Key Activities

Compare to similar projects, perform parametric checks, validate key rates, review quantity reasonableness, investigate anomalies, document reality check results and adjustments.

Phase 3
Risk & Refinement
Steps 9–11
9

Step 9: Assess Project Risks

Systematically identify and quantify risks that could impact project costs. This involves conducting risk workshops with project stakeholders, identifying threats and opportunities, assessing likelihood and consequence, and quantifying potential cost impacts. Risk assessment feeds directly into contingency determination in the next step.

Key Activities

Conduct risk identification workshops, assess likelihood and impact, quantify cost implications, develop risk register, identify mitigation strategies, document risk assessment methodology.

10

Step 10: Determine Level of Contingency

Calculate appropriate contingency to account for estimate uncertainty and identified risks. Two approaches are available: deterministic (applying percentage-based allowances to estimate elements) or probabilistic (using Monte Carlo simulation for quantitative risk analysis). Business case estimates require both P50 and P90 confidence levels. Contingency must be justified, not arbitrary.

Key Activities

Select contingency method, apply deterministic percentages or run probabilistic analysis, calculate P50 and P90 values where required, document contingency rationale, establish draw-down protocols.

11

Step 11: Determine Cashflow and Escalation

Project the timing of expenditure and apply escalation to account for cost changes over time. This involves developing a cashflow profile based on the construction program, applying escalation rates from Queensland Treasury's economic parameters, and calculating the outturn cost (today's dollars plus escalation). Cashflow impacts both funding requirements and escalation calculations.

Key Activities

Develop construction program, create cashflow profile, obtain current escalation rates, calculate real and nominal costs, present estimate in outturn dollars, document escalation assumptions.

Phase 4
Finalization
Steps 12–15
12

Step 12: Presentation of Costs

Organize and present the estimate in formats required by stakeholders and governance processes. Estimates must be presented in outturn dollars (including escalation), clearly distinguish between Capital Expenditure (CapEx) and Operational Expenditure (OpEx), and align with the PCEM Work Breakdown Structure for consistency. Multiple presentation formats may be required for different audiences.

Key Activities

Format estimate to PCEM WBS, separate CapEx and OpEx, prepare executive summary, develop detailed backup, create presentation materials, ensure consistency across all estimate views.

13

Step 13: Estimate Validation

Subject the estimate to independent peer review to verify accuracy, completeness, and methodology. All estimates require peer review by qualified cost estimators not involved in the estimate development. Projects exceeding $25 million also require concurrence review by Cost Estimating 1 (CE1) pre-qualified estimators. Validation findings must be addressed and documented.

Key Activities

Engage independent peer reviewers, facilitate concurrence review for projects over $25M, respond to review findings, document validation process, incorporate recommendations, obtain reviewer sign-off.

14

Step 14: Estimate Approvals

Obtain formal approvals from appropriate governance levels based on project value and phase. Approval requirements vary by agency and project phase, but typically include project director approval, executive endorsement, and potentially ministerial or cabinet approval for major projects. The estimate and supporting documentation must be submitted through defined approval channels.

Key Activities

Prepare approval submission, compile supporting documentation, present to approval authorities, address questions and concerns, obtain formal sign-off, distribute approved estimate to stakeholders.

15

Step 15: Document and Capture in 3PCM

Record the final estimate and all supporting information in the Program and Project Cost Management (3PCM) system and project files. Comprehensive documentation ensures traceability, supports future estimate updates, enables lessons learned analysis, and provides an audit trail. Documentation includes the estimate itself, assumptions, methodologies, data sources, risk assessments, peer review reports, and approval records.

Key Activities

Upload estimate to 3PCM system, document all assumptions and exclusions, compile backup calculations, archive source data, prepare estimate narrative, ensure documentation completeness and accessibility for future reference.

Cognitive Bias

Understanding and Counteracting Optimism Bias

Optimism bias is the demonstrated systematic tendency to underestimate costs, timescales, and risks while overestimating benefits in project planning.

What is Optimism Bias?

Research from the UK Treasury and other international bodies has conclusively shown that project cost estimates are typically optimistic, with actual costs exceeding initial estimates by significant margins. This is not due to poor estimating practice or deliberate manipulation, but rather an inherent human cognitive bias towards optimism when planning future activities.

Common manifestations of optimism bias in cost estimating include:

  • Underestimating complexity: Assuming construction will proceed smoothly without delays or difficulties
  • Overlooking risks: Failing to adequately account for known risks or identify emerging risks
  • Base rate neglect: Ignoring historical performance data in favor of project-specific optimism
  • Planning fallacy: Focusing on best-case scenarios rather than typical outcomes
  • Scope creep blindness: Not anticipating scope growth that typically occurs during design development
  • Strategic misrepresentation: Consciously or unconsciously presenting low estimates to secure approval

PCEM Measures to Counteract Optimism Bias

The PCEM framework incorporates several specific measures designed to counteract optimism bias and produce more realistic estimates:

1. Mandatory Historical Data Reference

Step 6 requires estimators to reference Queensland's SmartCost database of completed project costs. This grounds estimates in actual historical performance rather than optimistic projections. Significant deviations from historical benchmarks must be explicitly justified.

2. Structured Risk Assessment

Step 9 mandates systematic risk identification and quantification. This forces explicit consideration of what could go wrong, counteracting the natural tendency to assume everything will proceed according to plan. Risk workshops involving diverse stakeholders help identify risks that individual estimators might overlook.

3. P50/P90 Confidence Levels

Business case estimates must present both P50 (median, 50% confidence) and P90 (90% confidence) values. This explicitly acknowledges uncertainty and ensures governance decisions are made with realistic expectations rather than optimistic base estimates.

4. Independent Peer Review

Step 13 requires independent validation of all estimates. Fresh eyes from qualified estimators not invested in the project outcome provide objective assessment and challenge optimistic assumptions. Concurrence review for projects over $25 million provides an additional layer of independent scrutiny.

5. Reality Checks and Benchmarking

Step 8 mandates comparison against independent benchmarks and alternative calculation methods. This catches estimates that are significantly optimistic compared to industry norms or similar completed projects.

6. Documented Assumptions and Exclusions

Throughout the process, estimators must document all assumptions, exclusions, and areas of uncertainty. This transparency makes optimistic assumptions visible and challengeable, rather than buried in the estimate.

Practical Application

Effective estimators actively question their own optimism throughout the process:

  • When developing quantities, ask "What have I missed?" rather than assuming completeness
  • When selecting rates, favor actual historical data over theoretical calculations
  • When assessing duration, reference actual completed projects rather than ideal scenarios
  • When identifying risks, challenge the team to think of unlikely but possible events
  • When setting contingency, resist pressure to minimize in favor of realistic uncertainty allowances

"The greatest enemy of a good cost estimate is the optimism of the estimator. The PCEM process is deliberately designed to counteract this bias through structured analysis, historical grounding, risk quantification, and independent review. Following the process rigorously produces estimates that are credible, defensible, and realistic."

Cenex Expertise

How Cenex Applies the PCEM Process

As a CE1 pre-qualified cost estimator, Cenex has developed rigorous internal procedures that align with and enhance the PCEM 15-step process.

Cenex Value-Add

Where Cenex Adds Value Across the 15-Step Process

1Scope 2Collect 3Site 4Collate 5Types 6History 7Estimate 8Check 9Risk 10Conting. 11Cashflow 12Present 13Validate 14Approve 15Document
Cenex enhances Standard PCEM step

Information Gathering

Structured intake of scope, drawings, geotech & site data with auditable record.

Steps 1–4

Hybrid Estimating

First-principles plus benchmarked rates from Cenex's Queensland project database.

Step 7

Reality Checking

Independent peer-review against historical $/km, $/m² and $/t benchmarks.

Step 8

Risk Workshops

Facilitated stakeholder workshops capturing technical, commercial & market risks.

Step 9

Contingency Analysis

Monte Carlo modelling producing P50/P90 with traceable contingency build-up.

Step 10

Clear Communication

Stakeholder-tuned reports — board summary, technical pack, validation memo.

Steps 12–14

Our Process Enhancements

1

Structured Information Gathering

Steps 1-4

Comprehensive checklists ensure no critical information is overlooked:

  • Project kick-off meetings with all key stakeholders
  • Detailed design review workshops to identify gaps and inconsistencies
  • Systematic site visits with documented photo records
  • Formal RFIs to designers when documentation is incomplete

Front-end rigor pays dividends throughout the estimate, ensuring we estimate what will actually be built.

2

Hybrid Estimating Methodology

Step 7

Multiple methods combined based on design maturity and element criticality:

  • First principles: For critical elements, complex work, or where no historical data exists
  • Unit rates: For standard elements with well-established Queensland benchmarks
  • Global rates: For early estimates or elements with limited design information

Balances accuracy with efficiency, focusing detailed analysis where it adds most value.

3

Comprehensive Reality Checking

Step 8

Reality checks that go beyond simple benchmarking:

  • Multi-level checks: Reality checks at WBS Level 1, Level 2, and critical Level 3 elements
  • Parametric analysis: Project-specific unit rates compared to industry benchmarks
  • Trend analysis: Cost escalation tracking validated against market conditions
  • Peer challenge: Internal senior review before external peer review submission
4

Structured Risk Workshops

Step 9

Risk assessment critical to estimate credibility, using proven techniques:

  • Pre-workshop risk identification using checklists and historical reviews
  • Facilitated workshops with project team, designers, and client representatives
  • Structured assessment of likelihood and consequence using calibrated scales
  • Risk treatment strategies to inform project planning
  • Post-workshop quantification using appropriate probabilistic techniques

Experienced facilitators ensure workshops result in defensible risk assessments that stakeholders support.

5

Advanced Contingency Analysis

Step 10

Sophisticated techniques appropriate to project scale and complexity:

  • Deterministic contingency: Applied at WBS element level with justification
  • Monte Carlo simulation: For business case estimates requiring P50/P90 values
  • Sensitivity analysis: Identifying cost drivers and testing key assumptions
  • Scenario planning: Alternative cost outcomes based on decision points

Contingency presented as a management tool with clear protocols for governance and draw-down.

6

Clear Communication

Steps 12-14

Communicating complex estimates clearly for decision-makers:

  • Executive summaries: One-page overviews highlighting key numbers, assumptions, and risks
  • Detailed breakdowns: WBS-structured estimates with full traceability
  • Visual presentation: Charts, graphs, and infographics to convey key messages
  • Assumption logs: Clear documentation of inclusions, exclusions, and assumptions
  • Comparison reports: Clear explanation of changes from previous estimates

CE1 Pre-Qualified Expertise

Queensland CE1 Panel

Cenex is pre-qualified under Queensland's Cost Estimating 1 (CE1) panel, demonstrating our capability to deliver estimates for the most complex and valuable infrastructure projects. Our estimators hold relevant qualifications, have extensive Queensland project experience, and undergo continuous professional development to maintain currency with PCEM requirements and industry best practice. When you engage Cenex, you receive not just compliance with PCEM, but the benefit of years of experience applying these principles to real projects across Queensland.

Quality Assurance

Every Cenex estimate undergoes internal quality assurance before client delivery:

1
Peer review by senior estimators not involved in estimate development
2
Verification of calculations and data sources
3
Compliance check against PCEM requirements
4
Review of assumptions and documentation completeness
5
Director-level sign-off before submission

This rigorous process ensures that estimates delivered to clients are accurate, defensible, and ready for governance approval processes.

Need PCEM-Compliant Cost Estimates?

Cenex delivers CE1 pre-qualified, PCEM-compliant cost estimates for Queensland infrastructure projects.

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