Extension of Time (EOT)

An extension of time (EOT) is a formal mechanism written into most standard construction contracts that allows the completion date for a project to be moved back when certain qualifying delay events occur. Without this provision, any delay - even one caused entirely by the client or third parties - would leave the contractor technically in breach of contract and liable for liquidated damages. The EOT process protects both parties: it gives the contractor a legitimate route to more time, and it preserves the client's right to claim damages when delays are genuinely the contractor's fault.

How Extensions of Time Work in Practice

Under JCT contracts (the most widely used standard form in the UK), a contractor must notify the contract administrator or employer as soon as it becomes reasonably apparent that progress is being delayed, or is likely to be delayed, by a qualifying event. These qualifying events - called "Relevant Events" in JCT terminology - include exceptionally adverse weather conditions, force majeure, instructions from the employer that vary the works, and delays caused by the employer failing to give access to the site. Once the notification is submitted, the employer or contract administrator is required to assess the claim and respond within 12 weeks under JCT contracts, though this period varies under other standard forms such as NEC or FIDIC.

The outcome of a successful EOT claim is a new completion date. If the contractor then completes by that revised date, no liquidated damages apply. If the EOT is not granted, or is granted for less time than the contractor believes is justified, that disagreement can escalate to adjudication.

Common Reasons and Record-Keeping Requirements

The most frequent grounds for an EOT application include late issue of design information, employer-instructed changes to the scope of works, discovery of unforeseen site conditions, and exceptionally adverse weather beyond what could be reasonably expected for the time of year. Programme delays caused by a nominated subcontractor or specialist supplier can also qualify under certain contract forms.

The key requirement in almost all contracts is that the contractor must give timely notice. A failure to notify promptly - even where the contractor has a clear entitlement - can give the employer grounds to challenge or reject the claim. Maintaining a site diary, a delay event log, and clear records of instructions received is the operational foundation of any successful EOT application. Zigaflow's project tracking and site diary tools help contractors build the contemporaneous record that EOT applications depend on.