Extension of time (EOT) claims are among the most common and most important claims in construction projects. A successful EOT claim protects the contractor from liquidated damages and establishes the foundation for prolongation cost recovery. Yet many EOT submissions contain avoidable errors that significantly weaken or completely invalidate otherwise valid claims.
Based on our experience reviewing hundreds of EOT submissions across GCC projects, here are the five most common mistakes we see — and how to avoid them.
Mistake 1: Late or missing notice
This is the number one killer of EOT claims. Under FIDIC 2017, the contractor must give notice within 28 days of becoming aware of the event causing delay. This is a strict condition precedent — miss it, and your claim is dead regardless of its merits.
Under FIDIC 1999, the position was less clear-cut, and some jurisdictions were more lenient on late notices. But the trend across GCC tribunals is increasingly towards strict enforcement of notice requirements.
How to avoid it
Implement a notice management system from day one. Assign responsibility for monitoring potential claim events and issuing notices. When in doubt, issue the notice — it is always better to notify and later withdraw than to miss the deadline. Keep a register of all notices issued, with dates, references, and the relevant contract clause.
Mistake 2: Failing to demonstrate critical path impact
An EOT claim must demonstrate that the delay event affected the critical path of the project. Many submissions simply state that a delay occurred without showing how it impacted the planned completion date. This is insufficient.
A delay event that affects a non-critical activity with substantial float does not entitle the contractor to an extension of time — no matter how long the delay lasted. Tribunals expect to see a proper critical path analysis showing how the delay event pushed the completion date.
How to avoid it
Use a recognized delay analysis methodology (TIA, Windows Analysis, etc.) to demonstrate the critical path impact of each delay event. Start with the baseline or contemporaneous programme, identify the critical path, and show how the delay event changed it. If you don't have a proper CPM schedule, invest in creating one — without it, your EOT claim will always be vulnerable.
Mistake 3: Bundling multiple delay events into one claim
Many contractors submit a single EOT claim covering multiple delay events spanning months or even years. This approach makes it extremely difficult to assess the individual impact of each event and often leads to the entire claim being challenged.
Engineers and tribunals need to assess each delay event on its own merits: Was notice given? Was the event an employer risk? Did it affect the critical path? What was the specific impact in days? A bundled claim obscures these individual assessments.
How to avoid it
Submit separate EOT claims (or clearly separated sections within one submission) for each distinct delay event. Each event should have its own notice, cause analysis, critical path demonstration, and time impact calculation. This allows the Engineer to assess each event independently and makes your overall submission far more credible.
Mistake 4: Using the wrong programme as the basis
Some contractors base their EOT claims on the original baseline programme, even when that programme was superseded by approved revised programmes or was never properly approved in the first place. Others use programmes that don't reflect the actual status of the project at the time of the delay event.
The programme used as the basis for delay analysis must be appropriate for the methodology being applied. For a Time Impact Analysis, the impacted programme should reflect the actual status of the project immediately before the delay event occurred — not the original baseline from months or years earlier.
How to avoid it
Use the contemporaneous programme that was current at the time of the delay event. If you were regularly updating your P6 schedule (as you should be), use the update immediately preceding the delay event. If the baseline was never approved, address this in your submission — explain what programme you are using and why it is a reasonable basis for analysis.
Mistake 5: Ignoring contractor concurrent delay
Submitting an EOT claim without acknowledging or addressing contractor delays that occurred in the same period is a credibility mistake. Engineers and tribunals are experienced enough to identify concurrent delays, and failing to address them suggests either a lack of thoroughness or a lack of objectivity.
This doesn't mean you should concede your claim. It means you should demonstrate that you have considered all delay events — both employer and contractor risk — and explain why the employer risk events are independently critical and entitle you to the claimed extension.
How to avoid it
Conduct an objective analysis that considers all delay events, regardless of responsibility. Identify any contractor delays, explain their impact (or lack thereof) on the critical path, and demonstrate that the employer risk events independently justify the claimed extension. This approach builds credibility and makes your submission much harder to dismiss.
The bottom line
The difference between a successful EOT claim and a rejected one often comes down to procedural compliance and analytical rigor — not the underlying merits. Contractors who invest in proper notice management, regular programme updates, and methodologically sound delay analysis protect themselves from these common mistakes and significantly improve their chances of a favorable outcome.
Related services: Need help with an EOT submission? Claimetrica provides delay analysis, quantum claims assessment, and FIDIC contract advisory. Request a free consultation →