Does an extension of time automatically give prolongation costs?

No. Only compensable delays affecting the critical path and completion give prolongation costs. In the worked example, 74 days of EOT produced only 62 days of cost recovery.

Can I use tender preliminaries rates for prolongation?

No. Claims must reflect actual additional cost incurred, evidenced from records — not tender rates multiplied by the over-run period.

How does concurrent delay affect prolongation?

Where contractor culpable delay overlaps compensable delay, entitlement is reduced or eliminated for the concurrent period. A contractor cannot benefit from its own failings.

Short #1: Prolongation Cost Claims — The Basic Principles | Construction Disputes & Claims Shorts

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