FIDIC Extension of Time Claims: 5 Checks to Make Before You Submit
An extension of time claim is not won by the size of the delay. It is won by showing three things: that the delay hit the completion date, that the contract gives you time for that event, and that you told the Engineer in time. Miss one of the three and the claim is in trouble, however good the rest of it looks.
This guide walks through the five checks I would make before an extension of time claim leaves the building. It is written for Quantity Surveyors, contract administrators and planners working under the FIDIC Red Book and its Pink Book MDB version, with notes where the 2017 edition differs from the 1999 edition.
📋 What You Will Learn In This Article:
- The three tests every extension of time claim must pass
- The grounds for extension of time under Sub-Clause 8.4 and where the 2017 edition differs
- How the 28-day notice and the detailed claim periods work in practice
- Why the critical path matters more than the length of the delay
- Which delay analysis method suits which situation
- How to treat concurrent delay and mitigation without overclaiming
⚠️ Read your own contract first. FIDIC forms are almost always amended by Particular Conditions, and the effect of time bars depends on the governing law. This article is educational. It is not legal advice, so take specialist advice before relying on any deadline or method on a live claim.
The Three Tests Every Time Claim Must Pass
The five checks below sit under these three tests. Most failed claims I have seen did not fail on the size of the delay. They failed on entitlement that was never identified, a notice that was late or vague, or a programme that could not show the delay reached completion.
Check 1: Which Ground Are You Claiming Under?
An extension of time is not available for every delay. Under Sub-Clause 8.4 of the 1999 Red Book, the Contractor is entitled to an extension of the Time for Completion if completion is or will be delayed by one of the listed causes. Note the wording: completion must be delayed, not just a task.
| Ground (1999 Red Book, Sub-Clause 8.4) | What to prove |
|---|---|
| A Variation | An instructed change and its effect on the critical path, unless time was already agreed with the cost of the Variation |
| A cause of delay under another Sub-Clause | The specific Sub-Clause that gives time, for example 1.9 (late drawings or instructions), 2.1 (access) or 4.12 (unforeseeable physical conditions) |
| Exceptionally adverse climatic conditions | Weather records showing the conditions were exceptional, not just wet |
| Unforeseeable shortages caused by epidemic or governmental action | The event, why it was unforeseeable and the evidence of the shortage |
| Delay or prevention attributable to the Employer or its other contractors | The act or omission, who was responsible and when it happened |
The 2017 edition moves extension of time to Sub-Clause 8.5 and restructures the wording, so check the exact grounds in your own edition and Particular Conditions. Name the clause in your claim. "We were delayed by the Employer" is not a ground. "Sub-Clause 1.9, late issue of Revision C of the pile layout drawing" is.
Check 2: Was Notice Given in Time?
Under Sub-Clause 20.1 of the 1999 edition, the Contractor must give notice to the Engineer as soon as practicable, and not later than 28 days after becoming aware, or after it should have become aware, of the event or circumstance. If notice is late, the Time for Completion is not extended and the Employer is discharged from liability for that claim, subject to your contract and governing law.
Claim Timeline (1999 edition, Sub-Clause 20.1)
Three practical points:
- The notice only has to describe the event. It does not need the final number. Waiting until you can quantify the delay is how notices get missed.
- Continuing delays need updates. Where the effect continues, the first detailed claim is treated as interim and further interim claims are sent monthly, with a final claim after the effects end.
- Do not assume the 42-day claim is as strict as the notice. In at least one English case the court treated the 28-day notice more strictly than the 42-day detailed claim. That is not a safe basis for planning. Submit on time and check your governing law.
The 2017 edition, Sub-Clause 20.2, keeps the 28-day notice but gives the Engineer more duties when a notice arrives, so read it closely if you are on that edition. Use our free Contract Notice and Claim Deadline Planner to calculate the dates for FIDIC 1999, FIDIC 2017, NEC, JCT and custom subcontract periods.
Check 3: Did the Delay Reach the Completion Date?
A forty day delay to an activity can produce no delay to completion if that activity had float. A claim that lists delayed activities without showing the effect on the critical path is the most common weakness I see, and it is the first thing an Engineer or an opposing planner will attack.
That is why the baseline matters. You need the programme the Engineer accepted, and you need updates kept as a live programme file, not just a PDF. A PDF shows the dates. The live file shows the logic, and the logic is what proves the effect.
Several recognised methods exist for analysing delay. Which one fits depends on your records and the stage of the project.
| Method | How it works | Watch out for |
|---|---|---|
| As-planned versus as-built | Compares the baseline with actual progress | Does not prove critical path effect on its own |
| Impacted as-planned | Inserts delay events into the baseline programme | Depends on baseline logic and can overstate delay |
| Time impact analysis | Inserts an event into the programme as updated at the time | Needs reliable, regular programme updates |
| Windows analysis | Reviews progress in time slices and finds the critical delay in each | Needs good records and usually specialist support |
| Collapsed as-built | Removes the delay events from the as-built programme to see what would have happened | Relies on judgments about logic and on complete as-built data |
On a large claim, engage a planner and agree the method with them early. The method must also be allowed by your contract, so check whether it prescribes one.
Check 4: What Do Your Records Actually Prove?
Under Sub-Clause 20.1 the Contractor must keep the contemporary records needed to substantiate the claim. Ask of each record: does it show the cause, the date and the effect?
Records written weeks later from memory carry far less weight than records made at the time. Our free FIDIC Claim Document Checklist lists the documents to gather in four phases.
Check 5: Concurrency and Mitigation
Real projects rarely suffer one delay at a time. When a Contractor delay and an Employer delay overlap and both affect completion, you have concurrent delay.
The FIDIC forms do not give a simple answer. The 2017 edition refers to the rules in the Special Provisions, and if there are none, to the Engineer's assessment of the circumstances. The SCL Delay and Disruption Protocol suggests time but not money for the period of concurrency. That is guidance, not a contract term, so do not present it as if it were one.
Two habits protect you:
- Separate the causes. Identify which delays are Employer risk, which are Contractor risk and which overlap, and show your analysis for each.
- Show you mitigated. Record the steps you took to reduce the delay, such as resequencing or extra resources. A claim that ignores mitigation invites the question of why the Contractor did nothing.
Your Pre-Submission Checklist
Tick every box before the claim is issued. These boxes are a reading aid and are not saved.
Entitlement, Notice, Effect
If a claim fails any one of these three tests, the others cannot rescue it. Run the tests before you write a single page of narrative, and you will know early whether you have a claim worth submitting.
Where AI Can and Cannot Help
AI can help with the structure of a claim narrative and with a first pass at a record list. It cannot decide entitlement, read your critical path or confirm that a deadline has been met. Use fictional or approved information only, as explained in our article on what to check before uploading project documents to AI tools. Our Free AI Prompt Generator has a claim notice option that follows this approach.
Working Out Your Dates?
Calculate notice and claim deadlines for FIDIC, NEC, JCT and custom subcontract periods in seconds.
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Frequently Asked Questions
What is an extension of time claim under FIDIC?
It is a claim by the Contractor for more time to complete the Works, because completion is or will be delayed by an event that the contract recognises. Under the 1999 Red Book the main provision is Sub-Clause 8.4, and the claim must follow the procedure in Sub-Clause 20.1.
How long do I have to give notice of a delay claim?
Under the standard 1999 and 2017 forms the notice is due within 28 days of becoming aware, or of when you should have become aware, of the event. Your Particular Conditions may change this, so always check the executed contract.
What is the difference between the 1999 and 2017 claim periods?
Both editions use a 28-day notice. The standard 1999 form requires the fully detailed claim within 42 days, and the 2017 edition allows 84 days. The 2017 edition also gives the Engineer more duties when a notice or claim is received.
Can I claim an extension of time for delay to a non-critical activity?
Generally the entitlement is tied to delay to completion, so a delay to an activity with enough float may not extend the Time for Completion. Show the effect on the critical path and check your contract wording.
What happens if the notice is late?
Under the standard 1999 wording, the Time for Completion is not extended and the Employer is discharged from liability for that claim. How a court or tribunal applies this depends on the governing law and the exact contract wording, so seek specialist advice before assuming a late claim is lost or valid.
Does this apply to the Pink Book MDB edition?
The Pink Book is based on the Red Book, so the structure is similar. MDB projects often add Particular Conditions, so read the full contract and not only the General Conditions.
About The Author
Thushara Priyanka | BSc (Hons) Quantity Surveying | MRICS | MCIOB | MQSi
Chartered Quantity Surveyor with 19 years of experience on large scale infrastructure projects under FIDIC conditions.
AI Construction Hub shares practical professional guidance for Quantity Surveyors. Read more about the author.
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Editorial note: educational content only, not legal advice. Clause references describe the standard 1999 and 2017 FIDIC forms. Your contract may be amended and the effect of time bars depends on governing law. Verify against your executed contract and take specialist advice before relying on any method or deadline.
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