What Documents Are Needed for a Construction Claim Under FIDIC? A Practicing QS Complete Guide
Missing This Notice Can Lose You Millions
In construction claims under FIDIC, there is one document that matters more than all others combined. It is not the delay analysis. It is not the quantum calculation. It is not the as-built programme or the site diary or the expert report.
It is the claim notice.
FIDIC MDB Conditions of Contract Sub-Clause 20.1 is unambiguous. If the Contractor considers himself entitled to any extension of time or additional payment, he must give notice to the Engineer as soon as practicable and not later than 28 days after he became aware of the event or circumstance giving rise to the claim.
And if that notice is not issued within 28 days?
The Time for Completion shall not be extended. The Contractor shall not be entitled to additional payment. The Employer shall be discharged from all liability in connection with the claim.
A simple two or three word notice, missed by 28 days, can legally destroy a claim worth millions of dollars before a single document of evidence is ever reviewed.
That is the reality of construction claims under FIDIC. And it is why every QS professional working under these conditions must understand not just what documents are needed for a claim, but which one must come first, within a fixed deadline, without exception.
This article sets out the complete document framework for a FIDIC construction claim, organized by phase, drawn from real project experience.
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FIDIC Sub-Clause 20.1-The Most Important Clause in Any Claim
Before examining the full document framework, every QS professional must understand Sub-Clause 20.1 of the FIDIC MDB Conditions of Contract in full.
⚠️ FIDIC Sub-Clause 20.1 - Contractor's Claims:
"If the Contractor considers himself to be entitled to any extension of the Time for Completion and/or any additional payment under any Clause of these Conditions or otherwise in connection with the Contract, the Contractor shall give notice to the Engineer, describing the event or circumstance giving rise to the claim. The notice shall be given as soon as practicable, and not later than 28 days after the Contractor became aware, or should have become aware, of the event or circumstance."
"If the Contractor fails to give notice of a claim within such period of 28 days, the Time for Completion shall not be extended, the Contractor shall not be entitled to additional payment, and the Employer shall be discharged from all liability in connection with the claim."
FIDIC Conditions of Contract for Construction, MDB Harmonised Edition
⚠️ FIDIC Sub-Clause 20.1 - The 42 Day Fully Detailed Claim:
"Within 42 days after the Contractor became aware (or should have become aware) of the event or circumstance giving rise to the claim, or within such other period as may be proposed by the Contractor and approved by the Engineer, the Contractor shall send to the Engineer a fully detailed claim which includes full supporting particulars of the basis of the claim and of the extension of time and/or additional payment claimed."
This means Sub-Clause 20.1 creates TWO separate deadlines that every QS professional must track:
| Deadline | Requirement | Consequence if Missed |
|---|---|---|
| 28 Days | Issue claim notice describing the event or circumstance | Complete loss of entitlement to time and payment |
| 42 Days | Submit fully detailed claim with full supporting particulars | Claim may be rejected or significantly weakened without full particulars |
The 28 day notice preserves your legal right to claim. The 42 day detailed submission is what actually substantiates it. Missing either deadline creates serious commercial risk.
This clause creates a strict time bar. There is no discretion. There is no commercial pragmatism. Miss the 28 day deadline and the legal entitlement is gone, regardless of how strong the underlying claim might be.
When I evaluate a subcontractor claim on my current project, the first question I ask is always the same: did the subcontractor issue their claim notice within the required period? If the answer is no, the evaluation process effectively ends there, regardless of what comes next.
The Complete FIDIC Claim Document Framework
Beyond the critical claim notice, a professionally prepared FIDIC construction claim requires documentation across four distinct phases. Each phase serves a specific purpose in building the complete claim narrative.
Phase 1 - Foundation Documents (Establishing Entitlement)
These documents establish the contractual baseline. They define what was originally agreed, what was originally planned, and what the contract says about the event giving rise to the claim.
| Document | Purpose in Claim | Critical Check |
|---|---|---|
| Claim Notice | Preserves legal entitlement under Sub-Clause 20.1 | Issued within 28 days? If not, claim may be lost entirely. |
| Contract and General/Special Conditions | Establishes the contractual basis for entitlement and applicable notice procedures | Which FIDIC clause provides the entitlement? What are the specific notice requirements? |
| Original Drawings and Specifications | Defines the original contracted scope against which the change is measured | What was the original design? What changed? Can the change be clearly demonstrated? |
| Pre-Bid Estimate and Baseline Schedule (As-Planned) | Establishes the planned programme against which delay impact is measured | Is this the Engineer-approved baseline? Does it show the critical path clearly? |
Phase 2 - Contemporaneous Progress Records (Proving the Cause)
This is the most commonly deficient phase in contractor claim submissions. Contemporaneous records are documents created at the time the events occurred, not reconstructed afterwards. Their value in claim evaluation is directly proportional to their consistency and completeness.
💼 From My Professional Experience:
The most common missing documents in subcontractor claim submissions on my current project are clean contemporaneous records and updated programme files. Site teams focus on completing the works, which is understandable. But when a claim situation arises, the absence of consistent daily records and a live programme file creates a serious evidential problem that no amount of retrospective documentation can fully overcome.
Site people are often not aware of the importance of record keeping for commercial purposes. Their target is completing the works. The QS team's target is ensuring those works are properly documented if a claim situation arises. Bridging that gap requires proactive record keeping systems from day one of the project, not reactive document collection after a claim event occurs.
| Document | Purpose in Claim | Critical Check |
|---|---|---|
| Daily Site Reports and Project Diaries | Provides day by day record of manpower, plant, weather, progress, and site events | Are they signed by both parties? Are they consistent and complete? Are they contemporaneous? |
| RFI Logs and Files | Demonstrates information requests, response delays, and their impact on works | Are response times recorded? Do delayed responses correlate with programme impact? |
| Meeting Minutes | Provides signed contemporaneous record of discussions, decisions, and acknowledged issues | Are they signed by all parties? Do they reference delay events or instructions? |
| Site Photographs and Videos (Time-Stamped) | Visual evidence of site conditions, access restrictions, idle plant, and physical progress | Are they time-stamped? Do they clearly show the claimed conditions? |
Phase 3 - Change Management and Schedule Tracking (Proving the Effect)
Phase 3 documents demonstrate the impact of the claimed event on the project programme. This is where the delay analysis is built. Without a live, updated programme file, the delay analysis collapses into a Global Claim, which Engineers and courts almost universally reject.
| Document | Purpose in Claim | Critical Check |
|---|---|---|
| Change Order Logs (Approved, Pending, and Disputed) | Complete register of all variations and their status, demonstrating scope change history | Are all variations properly logged? Are disputed items clearly identified? |
| Updated Programme (Live File) | Demonstrates actual progress against baseline and identifies critical path impact of claimed events | Is this a live programme file or only a PDF? PDF alone is insufficient for delay analysis. |
| Material Delivery Logs and Procurement Status | Demonstrates material delivery delays and their impact on programme where relevant | Do delivery dates correlate with programme impact claimed? |
A critical professional note on programme files: Many contractors update their programme as a PDF for submission purposes but fail to maintain the live programme file with actual progress data. When a claim arises, only the live file can support a proper delay analysis. A PDF cannot be interrogated, cannot show logic links, and cannot demonstrate critical path impact. Maintaining the live programme file throughout the project is not optional for any contractor intending to protect their claim position.
Phase 4 - Financial and Cost Accounting Records (Quantifying the Loss)
Phase 4 documents substantiate the financial quantum of the claim. Without these records, the Engineer will value the claim at their own (usually lower) estimates rather than the contractor's actual costs.
| Document | Purpose in Claim | Critical Check |
|---|---|---|
| Labour Distribution Reports and Time Cards | Substantiates actual labour costs and idle time claims | Are they signed? Do they correlate with daily site reports? |
| Certified Payroll Records | Official payroll evidence for prolongation labour cost claims | Do rates match contract labour rates or market rates where applicable? |
| Equipment Logs and Rental Invoices | Substantiates idle plant costs and equipment prolongation claims | Do idle periods correlate with claimed delay events? Are invoices from the claimed period? |
| Subcontractor Claim Submissions and Invoices | Substantiates pass-through costs where subcontractor delays are caused by Employer events | Has the subcontractor's claim been properly evaluated before passing through? |
How AI Can Help With Claim Document Management
In my professional practice, AI tools assist with two specific aspects of claim documentation:
1. Drafting Claim Notices
When an Engineer's instruction arrives or a delay event occurs, the 28 day notice clock starts immediately. AI tools can help draft a professionally structured claim notice quickly, ensuring the notice is issued within the deadline while the full claim is still being prepared.
The notice does not need to contain the full quantum at this stage. It needs to describe the event and preserve the legal entitlement under Sub-Clause 20.1. AI can produce a professionally formatted notice in minutes once the basic event details are provided.
2. Drafting Claim Evaluation Responses
When evaluating subcontractor claims, the formal response letter must clearly state the contractual position, reference the applicable clauses, and explain the basis for the evaluation. AI assists in structuring these responses efficiently, reducing the time required for formal correspondence while maintaining professional standards.
All AI-drafted correspondence must be verified against the specific contract conditions before issue.
The Most Common Reason Claims Fail
After years of preparing and evaluating construction claims under FIDIC conditions, the most common reason a claim fails has nothing to do with the quantum calculation or the delay analysis methodology. It is one of these two things:
First: The notice was not issued within 28 days.
Site teams focus on completing works. QS teams focus on commercial management. When a delay event or instruction arrives, the immediate professional response must be to issue the claim notice first, before any assessment of entitlement, quantum, or delay impact. The notice preserves the legal right to claim. Everything else can follow.
Second: The contemporaneous records do not exist.
Site diaries not maintained consistently. Programme not updated as a live file. Meeting minutes not signed. Photographs not time-stamped. When the claim is prepared weeks or months after the event, there is nothing to substantiate the cause and effect. The claim becomes a Global Claim and is rejected.
Both problems share the same root cause: record keeping was not treated as a commercial priority from day one of the project. The professionals who prevent this are the ones who build record keeping systems into the project workflow before any claim situation arises, not after.
Conclusion
A construction claim under FIDIC is only as strong as its documentation. The most technically brilliant delay analysis built on weak contemporaneous records will struggle to survive Engineer evaluation. The most meticulously documented claim submitted one day after the 28 day notice deadline is legally worthless.
The framework in this article covers four phases of claim documentation, from the foundation documents that establish entitlement to the financial records that quantify the loss. Every phase matters. Every document serves a specific purpose.
But none of it matters if Sub-Clause 20.1 notice is not issued within 28 days.
Treat the notice as the claim. Everything else is the evidence that supports it.
💬 Found This Useful?
If this article helped you, please consider:
- ⭐ Sharing on LinkedIn, every QS professional working under FIDIC needs to read this
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- 📖 Reading our related articles, links below
What is the most important lesson you have learned about construction claims? Share it in the comments!
About The Author
A practicing Quantity Surveyor with extensive experience in large scale infrastructure projects under FIDIC conditions.
Qualifications:
- BSc (Hons) Quantity Surveying
- MRICS, Royal Institution of Chartered Surveyors
- MCIOB, Chartered Institute of Building
- MQSi, Quantity Surveyors International
This blog shares real professional experience from live construction projects, not theoretical content.
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Frequently Asked Questions
What is the most important document for a FIDIC construction claim?
The claim notice issued under Sub-Clause 20.1 within 28 days of the Contractor becoming aware of the event or circumstance. Missing this deadline results in complete loss of entitlement to additional time and payment, regardless of how strong the underlying claim may be.
What happens if the FIDIC claim notice is issued late?
Under Sub-Clause 20.1 of the FIDIC MDB Conditions of Contract, if notice is not issued within 28 days, the Time for Completion shall not be extended, the Contractor shall not be entitled to additional payment, and the Employer is discharged from all liability. The time bar is strict and applies regardless of the merits of the claim.
What are contemporaneous records and why are they important?
Contemporaneous records are documents created at the time events occurred, including daily site diaries, meeting minutes, RFI logs, and time-stamped photographs. They are critical because they provide real-time evidence of cause and effect that cannot be reconstructed after the fact. Without contemporaneous records, a claim becomes a Global Claim which Engineers and courts almost universally reject.
Why is a live programme file more important than a PDF?
A PDF programme cannot be interrogated, cannot show logic links between activities, and cannot demonstrate critical path impact. A live programme file (in Primavera P6 or equivalent) can be analysed to show exactly how a delay event impacted the critical path. Without a live file, proper delay analysis is impossible and the claim cannot be properly substantiated.
Can AI help with FIDIC claim preparation?
AI tools assist effectively with drafting claim notices quickly to meet the 28 day deadline, and with drafting formal claim evaluation responses. All AI output must be verified against the specific contract conditions before issue. AI cannot perform delay analysis, assess contractual entitlement, or make commercial judgment decisions.
What is a Global Claim and why is it rejected?
A Global Claim asserts a total sum without separately proving cause and effect for each element of the claim. Engineers and arbitrators reject Global Claims because the claimant has not demonstrated that specific events caused specific losses. Proper contemporaneous records and a structured claim that links each head of claim to specific documented evidence are required to avoid a Global Claim position.
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