Concurrent Delay Unravelled: Understanding and Handling Overlapping Delays
Concurrent delay is often discussed loosely, but genuine concurrency is narrower than many assume. It usually refers to overlapping delay events for which different parties are responsible, where each event affects completion at the same time.
Not every overlap is true concurrency
Two events happening in the same month do not automatically amount to concurrent delay. The real question is whether both events independently affected the critical path and whether each would have delayed completion during the same period.
That is why proper analysis matters. It is easy to overstate or understate concurrency if the programme logic and factual records are not tested carefully.
The usual result is time, but not cost
Where true concurrency is established, the contractor will often argue that it should receive relief from delay damages for the overlapping period because an employer-responsible event was also driving completion.
At the same time, recovery of prolongation cost for that period is usually much harder because the contractor's own delay was also contributing to the outcome.
Evidence is everything
Proving concurrency normally requires more than a narrative account. The programme record, as-built dates, notices and project records need to show how the competing events interacted and whether they were both critical.
A clear delay analysis, supported by proper records, gives the issue structure and helps avoid concurrency becoming a catch-all label for a poorly understood delay case.
Be open about it in claims
If concurrency is genuinely in issue, it is usually better to address it directly rather than hope it will go unnoticed. A balanced claim that explains the overlap clearly is often more persuasive than an aggressive position that ignores the contractor's own role.
That approach also helps separate the periods where cost recovery may still be available from the periods where the contractor is realistically only seeking time relief.
Key Takeaways
- True concurrent delay is narrower than simple overlap and usually requires both events to affect completion at the same time.
- The common practical outcome is entitlement to time relief without matching prolongation cost for the same period.
- Concurrency arguments depend heavily on programme evidence, factual records and careful analysis.
- A clear and balanced explanation of the overlap usually improves the credibility of an extension of time claim.
Key Points
- Concurrent delay requires both events to independently affect the critical path at the same time.
- True concurrency typically results in time relief but limits recovery of prolongation costs.
- Proving concurrency requires programme evidence, as-built data and contemporaneous records.