Concurrent Delay and Apportionment: Who Really Owns the Days

What Concurrent Delay Really Means

Concurrent delay is the single most contested idea in any construction delay claim, and it is where a schedule analysis either holds up or falls apart. In plain terms, concurrent delay occurs when two or more independent delays affect the project at the same time, and each of them, on its own, would have pushed the completion date out. One is typically the owner's responsibility, the other the contractor's. When both are driving the finish date during the same window, neither party can honestly claim the other caused all of the slip.

The reason this matters is money. Concurrency rarely changes whether the contractor gets more time, but it almost always changes whether the contractor gets paid for that time. Understanding the distinction is the difference between a defensible position and an expensive surprise.

Three Kinds of Delay, and Why the Labels Decide the Outcome

Before you can apportion anything, you have to classify each delay. Most disputes collapse into three categories, and the category dictates the remedy.

• Excusable and compensable delay. Caused by the owner or by circumstances the contract puts on the owner's account. The contractor is entitled to both a time extension and additional compensation for the extended period.
• Excusable but non-compensable delay. Outside either party's control, such as unusually severe weather or other events the contract treats as shared risk. The contractor gets more time, but no delay damages.
• Non-excusable delay. Caused by the contractor. No time extension, no compensation, and the contractor may be exposed to the owner's liquidated damages.

The trouble starts when a compensable delay and a non-excusable delay land in the same window on the critical path. That overlap is true concurrency, and it forces a hard question: if both parties were delaying the job at once, who pays for the days?

Why Concurrency Usually Buys Time but Not Money

The prevailing approach in construction claims separates the entitlement to time from the entitlement to cost. The logic is straightforward once you see it.

Time follows the critical path

If an owner-caused event delayed the completion date, the contractor is generally entitled to a time extension for that period, even if the contractor was also behind. The contractor should not be exposed to liquidated damages for days the owner also delayed.

Money follows fault, and fault is shared

Delay damages are different. To recover extended overhead, escalation, and prolongation costs, a contractor typically must show that the owner's delay was the sole cause of the loss during that period. When the contractor's own delay was running concurrently, that sole-cause link is broken. The result most parties land on: a time extension is granted, but delay costs are denied for the concurrent days. Neither side profits from a period they both caused.

This is why a careful delay apportionment is not academic. It is the mechanism that turns a messy overlap into a clean split of responsibility.

Apportionment Happens Day by Day, on the Critical Path

Apportionment is not a single percentage applied to the whole job. Credible analysis works period by period, walking the critical path through each schedule update and asking, for every window, which activities were actually controlling the finish date and who was responsible for them.

A disciplined day-by-day method generally does the following:

• Identifies the controlling critical path in each analysis window, not just at the baseline.
• Tags each critical or near-critical delay to owner, contractor, or a shared or neutral cause.
• Flags windows where owner and contractor delays overlap on the driving path as true concurrency.
• Separates the time result (extension) from the cost result (compensability) for each window.
• Rolls the windows up into a total that shows owner days, contractor days, and concurrent days distinctly.

The critical-path discipline is what keeps the exercise honest. A delay that never touched the driving path did not delay the project, no matter how disruptive it felt in the field. Only delays that consumed the completion date belong in the apportionment, and only genuine overlap on that path counts as concurrency.

Pacing is not concurrency

One trap deserves a warning. If a contractor deliberately slows work because an owner delay has already made the effort pointless, that is pacing, not an independent concurrent delay. Pacing is a reasoned response to someone else's delay, and treating it as contractor-caused concurrency unfairly erases a legitimate compensable claim. Distinguishing the two takes contemporaneous evidence, not hindsight.

The Practical Takeaway

Concurrent delay decides who owns the days, and the ownership is almost never all-or-nothing. Time and money travel on separate tracks: concurrency tends to protect the contractor from liquidated damages while denying delay costs for the shared period. Get the classification right, walk the critical path window by window, keep pacing out of the concurrency bucket, and the split becomes defensible instead of arguable.

Fragnet computes owner, contractor, and concurrent day-splits across the critical path automatically, so your apportionment is transparent, window by window, before the dispute ever reaches the table.