Understanding Delay Analysis Methodologies in Construction Disputes

Delay analysis is at the heart of construction dispute resolution. When projects overrun their scheduled completion dates, determining the cause, responsibility, and quantum of delay becomes a complex forensic exercise. This article examines the principal methodologies used by claims professionals worldwide.

Why Delay Analysis Matters

Construction delays have significant financial, contractual, and operational consequences. Extensions of time, liquidated damages, prolongation costs, and loss of productivity are all directly linked to the analysis of delay events. A robust and defensible delay analysis is essential for successful claims and dispute resolution.

As-Planned vs As-Built

The As-Planned vs As-Built method compares the contractor’s original baseline programme against the actual project timeline. This straightforward technique identifies deviations between planned and actual activity durations and sequences.

• Simple to understand and present
• Requires baseline programme and actual progress records
• Does not account for concurrent delays effectively
• Suitable for less complex disputes or preliminary assessments

Time Impact Analysis (TIA)

Time Impact Analysis is a prospective method that models delay events as they occur in chronological order. Each delay event is inserted into the programme at the point it occurred, and the resulting impact on the critical path is assessed.

• Considered the most robust and widely accepted methodology
• Demonstrates causation by showing how each event impacts completion
• Requires well-maintained contemporaneous programmes
• Accounts for concurrent delays and changes in critical path
• Recommended by the SCL Delay and Disruption Protocol

Windows Analysis

The windows analysis (or “time slice”) method divides the project duration into defined periods and analyses delay within each window. This retrospective technique examines what should have occurred versus what actually occurred in each period, identifying critical delays and their causes.

Collapsed As-Built

The collapsed as-built method works backwards from the actual completion date by “subtracting” identified delay events from the as-built programme. This reveals what the completion date would have been “but for” the delays in question.

Selecting the Right Methodology

The choice of methodology depends on available records, the complexity of the project, the nature of the dispute, and the requirements of the applicable contract and legal forum. In practice, experienced claims professionals often use a combination of methods to build the most compelling case.