Jurisdiction(s):
United Kingdom

Construction delay analysis: practical guidance and worked examples of six methodologies, with emphasis on APAB and time slice windows, for critical path assessment and extensions of time

Published by a LexisNexis Construction expert

Practice notes

Introduction

Delay analysis is undertaken by planning/programming specialists to determine the extent of delay to a project and the reasons for any movement to the completion date. This involves defining the critical path through the works and identifying delay events that fell on that path, thereby causing critical delay. Numerous methodologies exist and are typically chosen at the planning/programming analyst’s discretion. Several are endorsed by industry guidance, including the Association for the Advancement of Cost Engineering International (AACEI) Recommended Practice 29R-03 and the 2nd Edition of the Society of Construction Law Delay and Disruption Protocol (SCL Protocol). Specialist programming software, such as Primavera P6 or Asta Powerproject, is commonly employed to undertake a delay analysis, although, as this Practice Note explains, some techniques place greater reliance on the programmes than others.

The six main delay analysis methodologies are:

Impacted as-planned analysis
Time impact analysis
Time slice windows analysis
As-planned versus as-built in window analysis
Retrospective longest path analysis
Collapsed as-built analysis

The decision on which methodology to use will vary depending on a...

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Web page updated on 21/05/2026

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