Return to services

Disruption is essentially a production or productivity related loss, which occurs when events (Delay or otherwise) prevent a Contractor or Sub-Contractor from achieving planned progress and reduces the output of plant, equipment and or labour.  Disruption can be notoriously difficult to establish, evaluate and claim as the onus is on the Contractor, or Sub-Contractor alike, to provide evidence that work has been effected, the effect resulted in a quantifiable loss and that the disruption resulted from an event entitling the claimant to costs (or breach of contract in the alternative).


With construction becoming more complex these days, Contractor’s and Sub-Contractors actual performance can deviate significantly from that planned as events affect productivity and production and alter the sequence, method and manner of work.  These deviations impact both schedule performance and the overall cost of the project. One of the recognised methods a contractor can recover time and costs caused by the impact of events is “Disruption”.

Disruptions are events that occur on a project that interrupt, protract, delay and reduce the efficiency of works resulting in activities taking longer and completing later than planned.  It is usually the case that disruptive events are entangled, grouped or the cumulative effect of many events result in an aggregate loss.  It is therefore essential when performing an analysis that those which have resulted in “Delay” are separated from those which have resulted in disruption as the mechanisms for recovery are more than often differ greatly.

Methods of establishing disruption

At Halliant we have extensive experience in using CPM (Critical Path Method), Linear and Time Location methods of analysis to identify the incident and extent of disruption to construction and ICT projects.  Those methods we utilise, and are endorsed by the Society of Construction Law and Association for the Advancement of Cost Engineers, are:

  • Measured Mile,
  • Baseline Analysis,
  • Industry Studies, and
  • System Dynamics.

Along with the above, we also have experience in using Time Location derivates of these methods.

In establishing Disruption, we always revert to and rely upon the mechanism being claimed (or used for defence) to determine the method required, whether it be under Contract, or via other remedies at law, establishing the correct method is vital to the success of the analysis and ultimately the claim or defence.

Maximising your recovery

To maximise the recovery of Disruption, and therefore the costs that flow from Disruption, the claimant must usually illustrate how the planned duration, sequence, method and manner of work were affected.

Disruption is usually illustrated by those above methods but what is required is often much more than just a quantitative analysis, it is the story and presentation of these results which are vital to success.

At Halliant we specialise is presenting these results graphically and preparing robust and defensible narratives to support the Forensic Disruption Analysis.

The following graphics are an example of the types of charts and illustrations that Halliant can prepare in support of claims and expert testimony.