FIDIC Sub-Clause 17.6: The Liability Cap Explained
The liability cap is the most negotiated clause in any FIDIC contract. It determines the maximum financial exposure of both parties under the contract, caps the Contractor's worst-case liability to the Employer, and shapes every commercial and insurance decision that follows from signing. A Contractor who accepts a liability cap of 25 percent of the Contract Price on a design-and-build project with significant professional liability exposure is operating with a fundamentally different risk profile than one who accepts the standard form position. The difference is not always visible on a quick read of the General Conditions, because the modification is in the Particular Conditions, often in one or two sentences that are easy to overlook at tender stage.
This guide covers what Sub-Clause 17.6 requires, how the cap is calculated, what falls outside it, how Particular Conditions modify it, and what a commercial manager needs to identify before signing.
What Sub-Clause 17.6 Requires
In the FIDIC 1999 Red Book, Sub-Clause 17.6 is titled "Limitation of Liability" and does two things. First, it excludes liability for certain categories of loss entirely. Neither party is liable to the other for loss of use of any works, loss of profit, loss of any contract, or any other indirect or consequential loss or damage, even if the loss arises from negligence or breach. This exclusion applies symmetrically: the Contractor cannot claim consequential losses from the Employer, and the Employer cannot claim them from the Contractor, except to the extent expressly stated in the contract.
Second, Sub-Clause 17.6 limits total liability. The total liability of the Contractor to the Employer under or in connection with the contract, excluding liability under Sub-Clause 17.1 (Indemnities), does not exceed the sum stated in the Appendix to Tender. If no sum is stated in the Appendix, the cap defaults to the Accepted Contract Amount, which is the total contract price agreed at the time of award.
The FIDIC 2017 Red Book restructured Clause 17 significantly. In the 2017 edition, the consequential loss exclusion and the total liability cap are set out in separate sub-clauses within Clause 17, and the drafting was updated to address some of the interpretive uncertainties that arose under the 1999 text. The substantive effect is similar, but the clause numbering and cross-references differ. When the target keyword is "FIDIC Sub-Clause 17.6 liability cap," the reference is almost always to the 1999 Red Book, where the combined consequential loss exclusion and liability cap sit in a single provision at 17.6.
How the Cap is Calculated in Practice
The standard form sets the cap at the Accepted Contract Amount: the total contract price at award. On a lump sum contract, this is the fixed price. On a remeasure contract, this is the estimated value. The cap is expressed as a monetary figure in the Appendix to Tender, not as a percentage.
In practice, the Appendix to Tender figure is often left as the Accepted Contract Amount by default, because neither party takes the time to negotiate it specifically. The result is that the default cap is equal to the contract price, which represents a substantial ceiling on liability. A Contractor signing a £10 million FIDIC contract with an uncapped liability cap at contract price has a maximum liability of £10 million to the Employer under the General Conditions.
That default changes in two circumstances. The first is where the Particular Conditions expressly state a different figure or percentage. The second is where the contract is for design and build or EPC, where the Employer's risk of loss significantly exceeds the Contract Price in the event of a major failure. In those cases, the negotiation around the cap is often the most commercially significant discussion in the contract review process.
For a Contractor, the liability cap serves a function beyond limiting exposure in theory: it is a key input into the professional indemnity and public liability insurance programme. If the liability cap under the contract exceeds the coverage limits under the PI policy, there is an uninsured gap between the contractual exposure and the insurance. Commercial managers and risk functions need to review the cap alongside the insurance schedule to confirm that the Contractor's actual exposure under the contract is covered.
What Falls Outside the Cap
Sub-Clause 17.6 contains specific exceptions: categories of liability that are excluded from the cap and which can therefore be pursued without limit.
Under the 1999 Red Book, the standard exceptions to the liability cap are fraud, deliberate default by the defaulting party, and personal injury or death arising from an act or omission of the relevant party. These categories reflect the principle that a party should not be able to shelter behind a contractual cap when they have committed deliberate wrongdoing or caused death or personal injury through their own conduct.
The practical significance of these exceptions is most visible in the context of design liability. Where a Contractor is responsible for design and a design failure causes physical damage or personal injury, that claim may fall outside the cap entirely, depending on whether the governing law characterises it as a claim arising from an act or omission of the Contractor that caused death or personal injury. The cap limits contractual liability between the parties. It does not limit liability in tort or under statute, and in many jurisdictions there are claims that can be brought against a contractor for personal injury or property damage outside the contractual framework entirely.
A second category that merits attention is third-party claims. The Sub-Clause 17.1 indemnity, which is excluded from the 17.6 cap in the standard form, covers the Contractor's obligation to indemnify the Employer against third-party claims arising from the execution of the works. This means that if a third party is injured as a result of the Contractor's operations and brings a claim against the Employer, and the Employer seeks to recover under the Sub-Clause 17.1 indemnity, the cap does not apply to limit that recovery. The practical effect is that the Contractor's exposure to Employer claims arising from third-party incidents is uncapped under the standard form.
How Particular Conditions Modify the Liability Cap
The modifications to Sub-Clause 17.6 in Particular Conditions are almost universally adverse to the Contractor. The standard form position, a cap at the full Contract Price, is rarely made more favourable by Employers. It is routinely made less favourable.
Reduction of the cap below Contract Price. The most common modification is a cap expressed as a percentage of the Contract Price rather than the full amount: 50 percent, 25 percent, or in some cases as low as 10 percent. A cap of 25 percent on a £20 million project gives the Employer a maximum recovery of £5 million for any claim, regardless of the actual loss caused. For a Contractor taking on significant design risk or construction risk on a complex project, the gap between 25 percent of the Contract Price and the actual potential liability can be very large.
Linking the cap to insurance policy limits. Some Particular Conditions replace the Contract Price reference with a cap equal to the Contractor's insurance policy limits. The commercial effect depends on the relationship between the policy limits and the Contract Price. If the PI policy limit is lower than the Contract Price, linking the cap to insurance reduces it. If the required insurance limit is stated in the contract at a level below the Contract Price, the Employer is in effect setting the cap at a level below what the standard form provides, using the insurance requirement as the mechanism.
Asymmetric caps. Perhaps the most commercially dangerous modification is a cap that applies to the Contractor's liability but not the Employer's. Some Particular Conditions include language that limits the Contractor's total liability to a stated percentage of the Contract Price while maintaining the Employer's ability to pursue claims without a corresponding cap. The asymmetry is not always obvious: it may be expressed by retaining the cap on the Contractor's side while introducing broad indemnity provisions on the Employer's side that are carved out from the cap.
Expanding the exceptions. Standard Sub-Clause 17.6 has a narrow set of exceptions: fraud, deliberate default, death and personal injury. Particular Conditions sometimes expand the exceptions to include categories that give the Employer broad uncapped claims: defects in design, failure to complete on time, or breach of any statutory obligation. Each additional exception is a carve-out from the cap on one side only, increasing the Employer's uncapped exposure while the Contractor's cap remains in place.
The cumulative effect of these modifications can fundamentally change the risk profile of the contract. A commercial manager who reviews the General Conditions and notes that Sub-Clause 17.6 provides a cap at the Accepted Contract Amount, without reading the Particular Conditions amendments to that clause, has not reviewed the contract's liability position.
How AI Reviews Sub-Clause 17.6 Modifications
AI review of Sub-Clause 17.6 identifies every modification to the standard liability cap position and quantifies the commercial consequence. The analysis covers the cap level, whether it has been expressed as a percentage or a fixed figure, any Particular Conditions exceptions that expand the categories of uncapped liability, and any asymmetry between the Contractor's cap and the Employer's exposure.
For the consequential loss exclusion, AI identifies whether the standard bilateral exclusion has been modified to allow the Employer to claim categories of consequential loss that the Contractor cannot. On contracts where the Employer's primary concern is loss of revenue during a period of delayed completion, modifications that retain consequential loss liability for the Contractor while excluding it for the Employer can represent a very significant exposure that is not apparent from the General Conditions alone.
AI also reads Sub-Clause 17.6 alongside the insurance provisions to identify gaps between the contractual cap and the required insurance coverage. Where the Particular Conditions require PI insurance at a stated level, and the liability cap is set at a percentage of the Contract Price that differs from that insurance level, AI flags the inconsistency and its commercial consequence.
For teams reviewing FIDIC contracts across a portfolio, consistent AI review of Sub-Clause 17.6 and its Particular Conditions amendments removes the risk of a commercially significant liability cap modification being missed under time pressure. The same approach applies to all FIDIC risk provisions, including notice conditions precedent under Clause 20. For detail on how Clause 20 notice requirements operate and the condition precedent consequences of missing them, see the guide to FIDIC Clause 20 notice requirements.
For a broader view of how AI handles FIDIC contract review from initial upload to structured risk report, covering payment provisions, variation rights, and the full liability framework, see the complete guide to AI construction contract review.
Frequently Asked Questions
What is the standard FIDIC liability cap under Sub-Clause 17.6?
Under the FIDIC 1999 Red Book, Sub-Clause 17.6 limits the total liability of the Contractor to the Employer to the sum stated in the Appendix to Tender. If no sum is stated, the cap defaults to the Accepted Contract Amount, which is the total contract price. The standard position therefore caps the Contractor's total liability at the full Contract Price, with exceptions for fraud, deliberate default, and death or personal injury. This is the baseline position. Particular Conditions frequently reduce it significantly, often to a percentage of the Contract Price.
What is excluded from the FIDIC liability cap?
The FIDIC 1999 Sub-Clause 17.6 cap does not apply to: liability for fraud or deliberate default by the defaulting party, liability for death or personal injury caused by the relevant party's act or omission, and the Sub-Clause 17.1 indemnity obligations, which cover claims by third parties against the Employer arising from the Contractor's operations. Particular Conditions sometimes expand the list of exceptions, which reduces the effective value of the cap for the Contractor. Any expansion of the exceptions should be identified and commercially assessed before signing.
Can the FIDIC liability cap be negotiated?
Yes, and it regularly is. The cap is one of the most actively negotiated provisions in a FIDIC contract. Contractors typically seek to maintain the cap at Contract Price or to introduce a mutual cap that applies equally to both parties. Employers typically seek to reduce the cap and to expand the exceptions. The outcome depends on the commercial dynamics of the tender, the risk profile of the project, and the Employer's assessment of what the market will accept. The key point is that negotiation only happens before signing. A commercial manager who identifies the cap is below an acceptable level at tender stage has options. One who identifies it six months into the project does not.
How do Particular Conditions typically change the FIDIC liability cap?
The most common Particular Conditions modifications to Sub-Clause 17.6 are: reduction of the cap to a percentage of the Contract Price (50%, 25%, or lower); linking the cap to insurance policy limits rather than the Contract Price; introducing asymmetric provisions that cap the Contractor's liability but not the Employer's; and expanding the exceptions to include additional categories of uncapped liability such as design defects, delay damages, or statutory breaches. Any of these modifications can materially change the risk profile of the contract and should be identified, quantified, and either negotiated or priced before signing.
What happens if the liability cap is exceeded?
If the Contractor's total liability to the Employer under the contract reaches the cap stated in Sub-Clause 17.6 or the Particular Conditions, the cap operates as a ceiling: no further liability can be imposed on the Contractor under the contract for events covered by the cap, regardless of the Employer's actual loss. The Employer's claims that would otherwise succeed are limited in recovery to the cap amount. This is why the cap level matters so much: a Contractor with a cap of 25% of Contract Price and a project that suffers a significant defect or delay event may find that the Employer's actual losses far exceed what can be recovered under the contract. For the Employer, this means the difference between the cap and the actual loss becomes an unrecoverable commercial write-off unless claims can be brought outside the contractual framework entirely.
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