Which period and site resources should be used when valuing prolongation caused by employer delay?
Value the reasonable additional cost when and where the compensable event affected the works. The extension or overrun period is not automatically the correct cost window, and critical delay does not make every site resource recoverable.
Assess the cost during the period of causal effect and include only the extra resources required because of that effect
An extension of time measures the effect on the completion obligation; it does not itself value cost. Compare actual expenditure with the cost that would have been incurred absent the employer-risk event. Identify the event-effect period, affected activities and resources retained, disrupted or added. Where only part of the project was affected, whole-site preliminaries require proof that the critical delay caused those site-wide costs. Costs continuing on unaffected work remain outside the claim unless causally linked.
| Issue | Position |
|---|---|
| Extension period | Time relief, not automatic valuation window |
| Event-effect period | Primary period for causal cost analysis |
| Critical activity | Can delay completion without affecting all resources |
| Whole-site cost | Requires proof of site-wide causal retention |
| Affected part | Recover reasonable additional cost attributable to it |
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