FIDIC Clause 20 Explained: Claims, Disputes & Arbitration Process in 1999 vs 2017

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⚖️ Purpose of Clause 20 (FIDIC Yellow Book): Claims, Disputes & Resolution

Clause 20 isn’t just “legalese.” Think of it as the engine room for resolving hiccups, cost claims, or full-blown disputes on a project. Let’s explore how it keeps both parties on track—without drama!
🗺️ FIDIC Clause Map:
For a complete deep-dive on this topic, check out FIDIC Clause 20 Explained: Claims, Disputes & Arbitration Process in 1999 vs 2017.
And for how disputes are handled by the board: Dispute Board Appointment
  • Protects Both Parties’ Interests: Clause 20 is about fairness—it ensures the Employer and Contractor both have a voice when something goes wrong.
  • Provides a Step-by-Step “Road Map”: It guides you through notification, record-keeping, and resolution (Employer’s Claims (2017)).
  • Promotes Early Dispute Avoidance: By requiring prompt notice and a chance for amicable settlement, it keeps issues from ballooning into bigger battles.
  • Sets Clear Deadlines: “28 days to notify” is just one of several time bars that keep both sides organized (read more: Deadlines in Clause 20).
  • Defines a Streamlined Escalation Chain: From Engineer review to DAAB, amicable settlement, and finally arbitration.
💡 Why is Clause 20 Important for Every Project?
Without Clause 20, disputes could freeze the whole job site. It’s a blueprint for:
  • Quick notification (no last-minute surprises)
  • Transparent evidence and records
  • Getting fair Engineer’s decisions
  • Structured escalation—not instant arbitration!
See how a typical claim flows: FIDIC Clause 20 in Action →
“Better to fix a problem today with clear communication than fix it tomorrow in arbitration.”
— An experienced FIDIC user
The Bottom Line? Clause 20 is the contract’s promise: if something goes sideways, everyone gets a fair, organized chance to resolve it—without grinding the project to a halt.

Want to master FIDIC claims & dispute resolution? Read the full article here.

🧭 Breakdown of Clause 20 (1999 Edition):
Claims, Disputes & Arbitration—All-in-One Hub

In the FIDIC Yellow Book 1999, Clause 20 acts as a compass for everyone—Contractor, Employer, Engineer—on what to do if there’s a claim, a dispute, or even a deadlock. Here’s how each subclause works in practice (and why it matters).
20.1 – Contractor’s Claims
What it says: If the Contractor thinks they deserve extra time or money (like unforeseen site conditions or Employer delays), they must give a written notice within 28 days of becoming aware.
Why it matters: This “heads up” is essential. Miss it, and you could be time-barred—losing your right to claim.
  • Keep contemporary records (logs, invoices, diaries).
  • Submit a fully detailed claim (costs and time) after giving notice.
  • The Engineer reviews it (see Engineer’s Determinations: 3.5/3.7).
20.2–20.4 – Dispute Adjudication Board (DAB)
What they say: If either party isn’t happy with the Engineer’s call, the DAB (Dispute Adjudication Board) steps in—think of them as project referees.
Why it matters: The DAB keeps the project moving—delivers an interim solution that’s binding unless/until overturned.
20.5 – Amicable Settlement
What it says: Still not happy after the DAB’s decision (or if there’s no DAB)? Both parties must try to settle things amicably for at least 56 days before heading to arbitration.
Why it matters: This is the “sit down and talk” stage—often saves relationships, time, and money.
Amicable Settlement explained
20.6 – Arbitration
What it says: If no settlement is reached, the dispute goes to arbitration (usually under ICC Rules unless your contract says otherwise).
Why it matters: This is the “final stop.” Arbitration is binding—a formal legal route, but usually faster and more expert than court.
See FIDIC Arbitration process
20.7 & 20.8 – Failure to Comply & DAB Expiry
  • 20.7: If a party ignores the DAB’s decision, the other can go straight to arbitration (see details).
  • 20.8: DAB’s appointment may end when the project ends, or earlier if the contract says so (read more).
Why it matters: Makes sure nobody can “stall” forever—keeps things moving to a resolution.
“Clause 20 (1999) lumps claims, disputes, and arbitration together—a single dispute resolution hub. It’s not always simple, but it keeps the path clear for all parties.”
❓ Quick FAQ: Clause 20 (1999)
  • Q: What happens if you miss the 28-day notice for a claim?
    A: The claim may be time-barred—no entitlement!
  • Q: Can DAB decisions be ignored?
    A: Not without risk. Non-compliance leads straight to arbitration.
  • Q: Why “amicable settlement” before arbitration?
    A: It’s a last attempt to avoid costly, lengthy proceedings.
  • Q: Where can I learn how this changed in 2017?
    A: See the 2017 Clause 20/21 comparison

📝 2017 Edition: Clause 20—Claims + Clause 21—Disputes

With the 2017 FIDIC Yellow Book, claims and disputes got their own “lanes.” Clause 20 covers Employer’s & Contractor’s Claims; Clause 21 handles Dispute Resolution. Everything’s easier to follow, and 28-day notice is still king!
Clause 20 – Claims (by Employer or Contractor)
20.1 – Claims: Now, either party (Employer or Contractor) can make a claim—payment, extension of time (EOT), or other relief.
Why it matters: Even the Employer must serve notice, making the process much more balanced.
See Employer’s Claims (2017) guide
  • 20.2.1 – Notice of Claim: Serve within 28 days of becoming aware—or risk losing your claim (time-barred).
  • 20.2.2 – Engineer’s Initial Response: Engineer must respond promptly (acknowledge or ask for more info).
  • 20.2.3 – Contemporary Records: Keep real-time evidence of cost/delay. FIDIC insists: no records, no claim!
  • 20.2.4 – Fully Detailed Claim: Submit within 42 days (or as specified). Must include all supporting details.
  • 20.2.5 – Agreement or Determination: Engineer first looks for agreement, then issues a determination if not.
  • 20.2.6 – Continuing Effect: Ongoing issues? You can submit interim claims.
  • 20.2.7 – General Requirements: Outlines who signs, how to send claims, and other “housekeeping.”
Clause 21 – Disputes & Arbitration
All “can’t agree” steps now live here.
  • 21.1 – DAAB Constitution: Sets up the DAAB (how it works).
  • 21.2 – Failure to Appoint: What if parties can’t agree on DAAB members? (process)
  • 21.3 – Avoidance of Disputes: DAAB can give informal opinions—helping to avoid escalation.
  • 21.4 – DAAB’s Decision: The DAAB issues a formal, interim-binding decision (detailed DAAB guide).
  • 21.5 – Amicable Settlement: Parties must try to settle for at least 56 days before arbitration (amicable process).
  • 21.6 – Arbitration: The “final stop”—usually ICC rules, as before (arbitration explained).
  • 21.7 – Failure to Comply: If DAAB’s decision is ignored, straight to arbitration (consequences).
  • 21.8 – No DAAB in Place: Sets the fallback if no DAAB exists (see fallback path).
What’s new? The DAAB can now step in early, offer informal advice, and push for dispute avoidance—not just rule on disputes!
“2017’s split of claims and disputes makes FIDIC much easier to follow. The 28-day time-bar and the DAAB’s new ‘avoidance’ powers are game-changers for proactive contract management.”
❓ FAQ & Key Differences (1999 vs 2017)
  • Q: What happens if you miss the 28-day notice for a claim?
    A: You risk losing your entitlement—don’t miss it!
  • Q: What’s the main upgrade in 2017?
    A: Claims and disputes are in separate clauses; Employer’s Claims must be formally notified.
  • Q: What does the DAAB do?
    A: Helps avoid disputes early, can give informal opinions, and makes interim decisions.
  • Q: Where can I read more on how time-bars work?
    A: See Clause 20/21 deep dive

🛠️ Practical Takeaways: Making Clause 20 (& 21) Work for You

  • Know Your Deadlines: The 28-day window to notify a claim is crucial. Contractors and Employers must act fast.
  • Document Everything: Keep real-time, contemporary records. Evidence is king under Clause 20.
  • Engineer First: The Engineer’s determination process is your first negotiation table. Provide data, act in good faith.
  • Adjudication = Safety Net: If you can’t resolve a dispute, the DAB/DAAB provides an interim solution—don’t hesitate to use it.
  • Amicable Settlement is Not Optional: FIDIC requires parties to try settlement before arbitration. Skipping it may backfire!
In a Nutshell: FIDIC’s claims/dispute process works like a funnel—structured, thorough, and fair for both sides. Handle every claim systematically, on time, and with records. That’s the backbone of Clause 20.
Issue arises
Notice (28 days)
Engineer reviews
(tries to settle/decide)
DAB/DAAB
steps in
Amicable
settlement
Arbitration
(last resort)

🔍 Key Interpretations & Implications: The Real Power of Clause 20

A. The “28-Day Notice” Time Bar: Why So Strict?
28-day clock: It’s a true “time bar”—miss it, and your claim may be lost.
Interpretation: Not a guideline. Only compelling excuses may help, depending on law/jurisdiction.
Implication: Delay your notice? You may forfeit extra money/time. Employers face the same risk in FIDIC 2017.
Why? FIDIC wants rapid, real-time problem-solving with solid data (contemporary records).
B. Contemporary Records: The “Show Me the Evidence” Principle
Interpretation: No more “guesswork” claims—contemporary records are king.
Pro-Tip: Daily diaries: manpower, deliveries, weather, site conditions—your best “fuel” for claims.
Implication: Sloppy records weaken your position at every stage (Engineer, DAB/DAAB, or arbitration).
C. The Engineer’s Determination: Neutral or Biased?
Interpretation: Engineer is expected to be fair (see Sub-Clause 3.5/3.7).
Implication: Biased Engineers drive disputes to DAB/DAAB. Still, you must get a determination before heading to arbitration (unless contract says otherwise).
D. Adjudication: Quick and Interim-Binding
Interpretation: DAB/DAAB gives fast, binding (but interim) decisions.
Implication: You must comply (even if you’ll challenge later)—so project cashflow and progress keep moving.
E. Amicable Settlement: The Last Chance Before War ⚖️
Interpretation: Arbitration = last resort. FIDIC wants you to try to resolve for 56 days first.
Implication: Use that window! Mediation is a good option (even if not strictly required).
F. Time-Bar Realities (Late Notice & Late Engineer Responses)
Late Notice: Likely time-barred—especially explicit in FIDIC 2017.
Late Engineer Response: Claim may be deemed rejected (so you can escalate). Prevents “limbo.”
G. “Claims of Continuing Effect”
Interpretation: Can’t finalize your numbers? Interim claims allowed—keep Engineer updated.
Implication: Submit regular updates; final tally once full effect is known.
H. Employer’s Claims: 2017’s New Twist
Interpretation: Now Employer claims follow same rules—symmetry for both sides.
Implication: Employer must also notify, keep records, and seek Engineer’s determination.
I. Claims Under Other Clauses? Follow Clause 20!
If you see “subject to Clause 20” in Clauses 4, 8, 13 etc., that means: always follow the full notice & claims process!
J. Real-Life Impact
  • Admin Overhead: More discipline, but less surprises/disputes.
  • Risk: Miss deadlines? Lose big.
  • Cashflow: Interim decisions keep money and work flowing—even during a dispute.
Ask Yourself:
Can a handshake stand up if notice wasn’t sent? (Rarely!)
Could Engineer bias make DAB/DAAB inevitable? (It happens—prepare for it.)
Is quick settlement possible? (Yes—direct negotiation or mediation is smart.)
Bottom Line: Clause 20 isn’t just “red tape”—it’s a system for fairness, transparency, and keeping the project on track.
Don’t Wait, Communicate.

🧐 What If Scenarios? Real-World Clause 20 Stories

Nothing tests Clause 20 like practical “what ifs.” These stories show why timing, documentation, and following the resolution chain are so critical under FIDIC. Grab a coffee and see how real project dilemmas get solved!
Scenario 1: “Oops, We Forgot the 28-Day Notice!”
The Setup: Contractor finds a design omission, fixes it, but delays claim notice for 60 days.
Clause 20 in Action: Notice was due in 28 days. Under FIDIC 2017, missing this = claim is “dead on arrival.”
Engineer or Dispute Board likely says: “Sorry, too late.”
Risk: Delayed notices kill claims!
Send your notice on time—even if the claim details aren’t ready yet.
Scenario 2: Employer’s Delay to Provide Site Access
The Setup: Employer gives site access 6 weeks late. Contractor needs an extension/costs.
Clause 20 in Action: Contractor serves 28-day notice, tracks all costs, submits detailed claim. Engineer reviews—could grant EOT plus costs or dispute.
Either extension and reimbursement, or the dispute escalates to DAB/DAAB.
Delayed site access? Follow Clause 20 to preserve your rights.
Scenario 3: Multiple Overlapping Claims
The Setup: Contractor faces a new ground condition and a late variation—two claimable events overlap.
Clause 20 in Action: Serve notices for both. Engineer might grant part of each, or consolidate. Employer may counterclaim.
Complex? Engineer makes a broad determination. If not accepted, it goes to DAB/DAAB.
Keep your claims and records separate—even when events overlap!
Scenario 4: The Engineer Is Silent
The Setup: Contractor submits claim, Engineer doesn’t respond on time.
Clause 20 in Action: Under FIDIC 2017, claim can be deemed rejected if Engineer is silent—Contractor can then escalate.
Engineer’s silence fast-tracks you to DAB/DAAB or arbitration.
No response? You’re not stuck—FISIC has built-in “deemed” responses.
Scenario 5: Continuing Effect
The Setup: Bad weather keeps impacting the project. Contractor’s losses add up monthly.
Clause 20 in Action: Submit interim claims as impacts accrue. Update monthly until event ends, then submit final claim.
Employer stays updated; no shock “mega-claim” at the end.
Use interim claims—keep everyone informed as events unfold.
Scenario 6: The DAAB’s Decision Is Ignored
The Setup: DAAB finds in Contractor’s favor, but Employer refuses to pay.
Clause 20/21 in Action: Non-compliance lets you skip amicable settlement and head to arbitration.
Arbitrator can enforce, and Employer might face interest or penalties.
DAAB decisions must be followed—even if “interim-binding.” Ignore at your own risk!
Scenario 7: Employer’s Liquidated Damages
The Setup: Employer wants to apply liquidated damages under Clause 8.7. Contractor disputes fault.
Clause 20 in Action: Employer must still follow notice and claims process. Engineer decides, or dispute escalates.
Final answer may include EOT (reducing damages) or confirm Employer’s right to damages.
Even LDs need Clause 20 notice—no party can just impose them unilaterally.
Clause 20’s “What If” = A Reliable Roadmap:
28-day notice is your lifeline. Contemporary records = your best friend.
Engineer’s role matters, but DAB/DAAB/arbitration are there if things break down.
In real life, Clause 20 keeps projects from falling into chaos!

💡 Suggestions for Clarity & Improvement

Clause 20 can always be tailored for your project and local law. Here are smart ways to clarify ambiguities and improve fairness—each with a clear example and reasoning, in line with FIDIC’s Golden Principles (GP).
A. Define “Should Have Become Aware” (Time Bar Nuance)
Original FIDIC 2017 Text Suggested Wording
“The claiming Party shall give Notice of Claim within 28 days after the claiming Party became aware, or should have become aware, of the event or circumstance…” “The claiming Party shall give Notice of Claim within 28 days of the date the claiming Party first knew or, acting reasonably, ought to have known of the relevant event or circumstance. For clarity, ‘acting reasonably’ includes performing routine inspections and due diligence as required under Clause 4.10 [Site Data].”
Why? Adds an objective standard for “should have known,” using routine inspections as a guide. Less debate, more clarity.
GP2 Explicitly state if you are replacing or adding to the GCs. Example: “This sub-paragraph replaces the wording in Sub-Clause 20.2.1.”
B. Clarify the Outcome of Late Notice
Original FIDIC 2017 Text Suggested Particular Condition
“If the claiming Party fails to give notice within 28 days, any entitlement to EOT or additional payment shall be lost.” “If the claiming Party fails to provide the required notice within 28 days, the Engineer may (after consultation) disallow all or part of the claim only to the extent that the late notice has caused prejudice. In assessing prejudice, the Engineer shall consider whether the other Party was deprived of an opportunity to mitigate the impact.”
Why? Encourages fairness and common sense—if no harm was caused by late notice, don’t throw out the claim entirely.
GP2 Show exactly what’s replaced. Balanced amendments are encouraged—make them visible in your Particular Conditions.
C. Expand on Employer’s Claims (Equality in Evidence)
Standard FIDIC 2017 Text Suggested Additional Sub-Paragraph
Clause 20 covers both Employer and Contractor claims, but often only spells out records for the Contractor. “When the Employer asserts a claim for delay damages or other relief, the Employer shall comply with the same obligations under Sub-Clause 20.2.3 [Contemporary Records] and Sub-Clause 20.2.4 [Fully Detailed Claim].”
Why? Puts both parties on equal footing—no “surprise” liquidated damages, and no one-sided burden of proof.
D. Streamline the Engineer’s Determination Deadlines
Original Wording Proposed Amendment
“The Engineer shall proceed to agree or determine the claim within 42 days…” “The Engineer shall review and give a preliminary response within 21 days, stating any additional information required. A final determination shall be issued within a further 21 days from receipt of such additional information or from expiry of the 21-day preliminary review period. If the Engineer does not respond within this total of 42 days, the claim shall be deemed rejected, allowing the claiming Party to proceed under Clause 21 [Disputes and Arbitration] without further notice.”
Why? No more “wait 42 days to get more data.” This forces the Engineer to engage early and gives clarity to both parties on next steps.
E. Referencing Specific Technical Standards (e.g., India BIS/IS Codes)
Suggested Subclause:
“If any claim arises from compliance with local regulations (e.g., BIS codes for design standards), the claiming Party shall provide the relevant references to IS: xxx or other statutory codes in its fully detailed claim submission under Sub-Clause 20.2.4.”
Why? Makes every claim clearer and grounded in local law—reducing surprises and endless debate over standards or what was “unforeseeable.”
F. Encourage Mediation or Early Neutral Evaluation (ENE)
Suggested Subclause:
“Before referring a dispute to the DAAB under Clause 21, either Party may propose an independent mediation or Early Neutral Evaluation. If the other Party agrees, the 56-day amicable settlement period shall include this mediation/Evaluation. This provision does not override the mandatory steps of Clause 20, but supplements them where mutually agreed.”
Why? Adds flexibility for quick, cost-effective settlements without skipping FIDIC’s core procedures—great for parties open to collaboration.
G. Clarify “Standing” DAAB vs. “Ad-Hoc” DAB
Suggested Particular Condition:
“A Standing DAAB shall be appointed within 56 days from the Commencement Date, in accordance with Sub-Clause 21.1. The DAAB shall visit the Site every [x months] (or as deemed necessary) to proactively identify potential disputes, provide informal guidance, and encourage resolution under Clause 20 before disputes crystallize.”
Why? Turns the DAAB into a true “dispute avoidance” team—ideal for complex or long-running projects. Keeps disputes small and solvable!
H. Roadmap for Adjusting Claims after Partial Approvals
Suggested Subclause:
“If the Engineer issues a partial determination for a claim under Sub-Clause 20.2.5, the claiming Party may, within 14 days, issue a revised statement with updated cost/time calculations. The Engineer shall treat this as a continuation of the initial claim rather than a separate claim, unless the parties agree otherwise.”
Why? Avoids a messy chain of overlapping claims and clarifies the next step for both parties—all under one process.
I. Ensure All Amendments Follow GP2 and GP4
GP2: Explicitly label every change (e.g. “This Particular Condition replaces the final paragraph of Sub-Clause 20.2.1.”)
GP4: Local law tweaks? Confirm they do not override FIDIC’s core steps—especially Engineer and DAB/DAAB roles.
Why? Clarity for everyone—prevents unintentional loopholes and shows how each PC fits the “Golden Principles.”
J. Example Particular Condition Text Block
PC 20.2.1: Notice of Claim (Replacement) The text of General Conditions Sub-Clause 20.2.1 is deleted in its entirety and replaced with the following: (a) The claiming Party shall give Notice of Claim within 28 days of the date the claiming Party first knew, or acting reasonably should have known, of the relevant event or circumstance. (b) If such Notice is not provided within this period, the claiming Party’s entitlement to an extension of time or additional payment shall be reduced only to the extent the late notice has caused prejudice to the other Party, as determined by the Engineer. (c) The Engineer shall issue a preliminary response under Sub-Clause 20.2.2 within 14 days of receiving this Notice, identifying any missing information.
K. Summing Up the Improvement Strategy
  • Define ambiguous triggers like “should have become aware.”
  • Allow partial grace for late notice if no real harm—keep discipline, but avoid harshness.
  • Upgrade Engineer deadlines for faster, clearer responses.
  • Treat Employer and Contractor claims with equal notice/records.
  • Encourage mediation/ADR—but don’t remove mandatory formal steps.
  • Always label and explain your Particular Condition tweaks in light of FIDIC Golden Principles.
💡 Pro-Tip: Always add a short “reason for this change” note for each Clause 20 tweak—future readers (and arbitrators) will thank you!

🔎 Key Differences: Clause 20 – FIDIC 1999 vs. FIDIC 2017

Sub-Clause FIDIC 1999 FIDIC 2017 Key Differences
20.1
(Contractor’s Claims)

vs.
20.2
(Claims for Payment/EOT)
“The Contractor shall give notice to the Engineer… within 28 days of becoming aware…” “The claiming Party shall give Notice of Claim within 28 days after it became aware, or should have…” 1. Applies to both Contractor and Employer (not just Contractor).
2. 2017 is explicit—late claim = “time-barred.”
3. Employer’s Claims: 1999 had these in Sub-Clause 2.5; 2017 merges them into Clause 20.
20.2–20.4
(DAB)

vs.
21.1–21.4
(DAAB)
“Dispute Adjudication Board… shall be one or three suitably qualified persons…” “The DAAB (Dispute Avoidance/Adjudication Board)… may give informal assistance to prevent disputes…” 1. Name/Role: DAB (1999) vs. DAAB (2017), with “Avoidance” added.
2. 2017 allows the DAAB to step in early—proactive, not just reactive.
3. Clearer procedures and more focus on dispute avoidance in 2017.
20.5
(Amicable Settlement)

vs.
21.5
(Amicable Settlement)
“Each Party shall attempt to settle the dispute amicably before commencement of arbitration.” “The Parties shall attempt to settle amicably before giving a Notice of Arbitration…” 1. 1999: 56-day “cooling off” post-DAB.
2. 2017: Similar cooling-off, now tied to DAAB and Clause 21 steps.
3. 2017’s language is more structured about pre-arbitration steps.
20.6
(Arbitration)

vs.
21.6
(Arbitration)
“Unless settled amicably, any dispute… shall be finally settled by international arbitration…” “Any Dispute not resolved under this Clause shall be referred to arbitration…” 1. In 2017, final arbitration now sits in Clause 21.
2. 2017 builds on DAAB and amicable settlement before arbitration.
3. Arbitration is clarified as last resort, referencing prior steps.
20.7 & 20.8
(1999)

vs.
21.7 & 21.8
(2017)
“Failure to Comply with DAB’s Decision” and “Expiry of the DAB’s Appointment” “Failure to Comply with DAAB’s Decision” and “No DAAB In Place” 1. Both: Can jump straight to arbitration if DAB/DAAB ignored.
2. 2017 adds details on DAAB’s role, re-appointment, or “no DAAB” scenario.
3. Greater dispute avoidance and clarity in 2017 on board processes.

📌 Additional Observations on Clause 20: FIDIC 1999 vs. 2017

  • 🔗Scope of Clause 20:
    1999: All Contractor’s claims, DAB, settlement, and arbitration in one clause.
    2017: Split—Clause 20 (all claims), Clause 21 (dispute steps: DAAB, settlement, arbitration).
  • ⚖️Employer’s Claims:
    1999: Employer’s claims in Sub-Clause 2.5, cross-referencing Clause 20.
    2017: Both parties use Sub-Clause 20.2—symmetrical process.
  • Time-Bar:
    1999: Implied, but not always explicit—missing notice may lose claim.
    2017: Now explicit—missed notice = claim barred.
  • 🛡️Dispute Avoidance:
    1999: DAB usually formed after a dispute arises.
    2017: DAAB is proactive—site visits, informal opinions to prevent disputes.
In a nutshell:
1999 = single Clause 20 for claims and disputes.
2017 = split: Clause 20 (claims), Clause 21 (disputes/DAAB).
Time-bar rules and dispute avoidance are clearer and more robust in the 2017 edition.

✅ Clause 20 Claims Checklist (FIDIC 1999 & 2017)

# Checklist Item Description / Guidance Sub-Clause Reference Check
1. Event Trigger & Awareness Has the party identified the specific event or circumstance giving rise to a claim (delay, additional cost, etc.)? 20.1 (1999) / 20.2.1 (2017)
2. Timely Notice of Claim Was notice issued within 28 days of becoming (or should have become) aware of the claim event? 20.1 (1999) / 20.2.1 (2017)
3. Contemporary Records Are relevant daily logs, site diaries, cost ledgers, etc., documented to substantiate the claim? 20.1 (1999) / 20.2.3 (2017)
4. Fully Detailed Claim Has a complete claim (time/cost calculations, justification, references to contract clauses) been submitted? 20.1 (1999) / 20.2.4 (2017)
5. Engineer’s Initial Response Has the Engineer acknowledged or requested further info in response to the claim notice (within specified days)? 20.1 (1999) / 20.2.2 (2017)
6. Engineer’s Determination Has the Engineer issued a fair determination (or partial acceptance) within the contractual timeline? 20.1 (1999) / 20.2.5 (2017)
7. Time-Bar Compliance Check if late notice or missing data might disqualify or reduce the claim (especially 2017 edition). 20.1 (1999) / 20.2.1 (2017)
8. Continuing Effect (if applicable) If the issue is ongoing, have you submitted interim/follow-up claims as required by contract? 20.1 (1999) / 20.2.6 (2017)
9. Adjudication Board Steps If the claim is disputed, have you referred it to DAB (1999) or DAAB (2017) per the correct procedure/timeline? 20.2–20.4 (1999) / 21.1–21.4 (2017)
10. Amicable Settlement Window Have you observed the mandatory “cooling-off” (56 days, typically) before arbitration? 20.5 (1999) / 21.5 (2017)
11. Final Arbitration If unresolved, has the dispute been properly referred to arbitration (not skipping prior steps)? 20.6 (1999) / 21.6 (2017)
12. Employer’s Claims (if applicable) For 1999: Check Sub-Clause 2.5 references to Clause 20. For 2017: Ensure Employer follows same notice/record steps. 2.5 & 20.1 (1999) / 20.2 (2017)
How to use: Review after major project events. Tick off as you comply. Keep documentation—so you can answer “Yes!” with confidence!

📄 Sample Letters for Clause 20 (FIDIC 1999 & 2017)

Below are template letters for typical Clause 20 scenarios. Expand each for an easy-to-adapt example. Always adjust details and references to fit your contract and project!
1. Notice of Claim (Contractor to Engineer/Employer)
Purpose: Timely notice of an event causing delay or extra cost.
Subject: Notice of Claim – [Brief Event Description]

Date: [Date of Letter]

To: [Engineer’s Name / Employer’s Representative]
From: [Contractor’s Authorized Representative]

Dear [Engineer’s Name / Employer’s Representative],

Sub-Clause [20.1 (1999) or 20.2.1 (2017)] – Notice of Claim

We write to give formal notice of a claim under Sub-Clause [20.1 / 20.2.1], arising from the following event or circumstance:

Event/Cause: [Describe event—e.g., Late access to Site Area B; Discovery of unforeseen utilities, etc.]
Date of Occurrence or Discovery: [Date Contractor first became aware or should have become aware]
Immediate Impact: [e.g., Delays to earthworks, Additional manpower costs, etc.]
Preliminary Estimate:
  Time Impact: [X days/weeks]
  Cost Impact: [Provide approximate sum or state "to be detailed later"]

We confirm that contemporary records are being kept as per Sub-Clause [20.1 / 20.2.3]. A fully detailed claim will follow within the time limit stated in Sub-Clause [20.1 (1999) / 20.2.4 (2017)].

Thank you for your attention. If you require more information, kindly advise promptly.

Yours faithfully,

[Signature]
[Name]
[Title / Position]
[Contractor’s Organization]
      
2. Fully Detailed Claim (Contractor to Engineer)
Purpose: Submission of full supporting evidence after the initial notice.
Subject: Fully Detailed Claim – [Event Reference / Claim No.]

Date: [Date of Letter]

To: [Engineer’s Name]
From: [Contractor’s Authorized Representative]

Dear [Engineer’s Name],

Sub-Clause [20.1 (1999) / 20.2.4 (2017)] – Submission of Fully Detailed Claim

Following our initial Notice of Claim dated [date], we now submit our fully detailed claim:

Event Description: [Late site handover, Variation No. X, Unforeseen ground conditions, etc.]
Chronology: [Timeline from trigger date to milestones.]
Cause and Effect: [Link event to delay/cost.]
Records and Evidence:
  Appendix A: Site diaries, daily manpower logs.
  Appendix B: Correspondence logs.
  Appendix C: Cost breakdowns.
Claimed Entitlement:
  Extension of Time: [XX days/weeks]
  Additional Payment: [Currency & amount]

We request the Engineer’s determination under Sub-Clause [3.5 (1999) / 3.7 (2017)] within the contract period.

Please let us know if further clarification is needed.

Yours faithfully,

[Signature]
[Name]
[Title / Position]
[Contractor’s Organization]
      
3. Engineer’s Determination (Engineer to Contractor/Employer)
Purpose: Engineer issues a determination based on the submitted claim.
Subject: Engineer’s Determination – [Claim No. / Reference]

Date: [Date of Letter]

To: [Contractor’s Representative]
Cc: [Employer’s Representative]

Dear [Contractor’s Name / Representative],

Sub-Clause [3.5 (1999) / 3.7 (2017)] – Engineer’s Determination

Having reviewed your claim dated [date], including records and correspondence, I now determine as follows:

Event Description: [Summarize the claim event]
Reviewed Evidence: [Site diaries, cost breakdowns, etc.]
Assessment:
  Extension of Time: [X days/weeks granted or rejected]
  Additional Payment: [Amount granted or rejected]
Conditions: [Further requirements, e.g., mitigation, more records]
Reasons: [Basis for granting/rejecting, with contract clause references]

This determination is binding unless revised by DAB/DAAB decision or amicable settlement/arbitration.

Yours faithfully,

[Signature]
[Name, Title]
[Engineer’s Organization]
      
4. Notice of Dissatisfaction (Either Party to Engineer/Other Party)
Purpose: Dispute the Engineer’s determination and trigger escalation.
Subject: Notice of Dissatisfaction – Engineer’s Determination [Ref.]

Date: [Date of Letter]

To: [Engineer’s Name / Other Party]
From: [Party’s Representative]

Dear [Engineer / Employer / Contractor’s Name],

Sub-Clause [20.4 / 3.5–3.7 (1999/2017)] – Notice of Dissatisfaction

We refer to your determination dated [date] regarding [Claim No. / Dispute]. We issue this Notice of Dissatisfaction for these reasons:

Areas of Disagreement: [EOT duration, cost disallowed, etc.]
Supporting Rationale: [Extra evidence, arguments.]

We wish to proceed per Clause 20 (1999) or Clause 21 (2017)—referral to [DAB / DAAB] under [20.4 (1999) / 21.4 (2017)], unless settled amicably.

Yours faithfully,

[Signature]
[Name]
[Title / Position]
[Party’s Organization]
      
5. Notice to Refer Dispute to DAB/DAAB (Either Party to DAB/DAAB, copying Other Party)
Purpose: Formally refer a dispute to the Board for a decision.
Subject: Referral to [DAB / DAAB] – Dispute [Reference]

Date: [Date of Letter]

To: [DAB/DAAB Chair or Member(s)]
Cc: [Other Party, Engineer]

Dear [Chairperson / Member(s) of DAB/DAAB],

Sub-Clause [20.4 (1999) / 21.4 (2017)] – Referral of Dispute

Pursuant to the Contract between [Employer] and [Contractor] dated [date], we refer the following dispute for decision:

Dispute Overview: [Summarize disputed claim, reference numbers/dates]
History: [Attempts at settlement, partial resolutions]
Relevant Documents: [Attach claim, Engineer’s determination, NOD, etc.]
Relief Sought: [EOT, cost, removal of liability, etc.]

We request a decision within the Sub-Clause [20.4 (1999) / 21.4.3 (2017)] timeline.

Thank you for prompt consideration.

Yours faithfully,

[Signature]
[Name]
[Title / Position]
[Organization]
      
6. Notice of Intent for Amicable Settlement (Either Party to the Other)
Purpose: Start the cooling-off/amicable settlement period.
Subject: Initiation of Amicable Settlement Discussions

Date: [Date of Letter]

To: [Other Party’s Representative]
Cc: [Engineer, DAAB Chair]

Dear [Name],

Sub-Clause [20.5 (1999) / 21.5 (2017)] – Amicable Settlement

Referencing the [DAB / DAAB decision] dated [date], we are not satisfied with the outcome. We acknowledge the obligation to attempt settlement under Sub-Clause [20.5 / 21.5] for at least [56 days or stated period] before arbitration.

We propose discussions:

Meeting Date: [2–3 options]
Location / Virtual: [Specify]
Agenda: [Exchange viewpoints, seek compromise]
If you prefer a different settlement method (e.g., mediation), please advise. We look forward to constructive dialogue.

Yours sincerely,

[Signature]
[Name]
[Title / Position]
[Party’s Organization]
      
7. Referral to Arbitration (Either Party to the Other)
Purpose: Formally commence arbitration after amicable period fails.
Subject: Commencement of Arbitration Proceedings

Date: [Date of Letter]

To: [Other Party’s Representative]
Cc: [Engineer, DAAB Chair, Arbitrator (if appointed)]

Dear [Name],

Sub-Clause [20.6 (1999) / 21.6 (2017)] – Reference to Arbitration

Despite efforts at amicable settlement after [DAB / DAAB] decision, no settlement was reached. As per Sub-Clause [20.6 (1999) / 21.6 (2017)], we refer the dispute(s) to arbitration:

Dispute Reference: [Describe dispute as in earlier notices]
Previous Steps: [DAB/DAAB date, Notice of Dissatisfaction date, Amicable period end date]
Arbitral Rules: [ICC, UNCITRAL, etc.]
Relief Sought: [Remedy or sum claimed]

We will proceed in compliance with the contract and applicable arbitral rules.

Yours sincerely,

[Signature]
[Name]
[Title / Position]
[Party’s Organization]
      
Tips for Clause 20 Letters:
– Always quote the correct sub-clause.
– Mind the 28-day notice period.
– Attach strong evidence: records, costs, logs.
– Be concise, clear, and reference contract terms.
– Copy all relevant parties for transparency.
These templates help you cover FIDIC best practice—adapt to your situation!

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