Two questions decide most of these disputes: whether the completion date is the one the contract now requires, and whether the clause survives challenge.
Enforceability, and the date they run from.
The penalty test was reformulated by the Supreme Court in Cavendish Square Holding v Makdessi and ParkingEye v Beavis. The question is whether the clause imposes a detriment out of all proportion to any legitimate interest of the innocent party in enforcement, not whether it is a genuine pre-estimate of loss.
Where the contractor is terminated before completion, Triple Point Technology v PTT confirmed that liquidated damages accrue up to termination. The Court of Appeal's contrary approach did not survive.
The date matters as much as the clause. Every successful extension of time moves the date liquidated damages run from, which is why extension and liquidated damages disputes are the same dispute argued from two ends.
If the extension machinery has broken down and time is at large, liquidated damages generally fall away and the employer is left proving general damages.
How the exposure is established.
The clause and the date are tested separately.
Establish the contractual date
Take the original date and apply every extension granted or due.
Fix actual completion
Determine the date of completion or takeover as the contract defines it.
Test the clause
Assess enforceability against the legitimate interest standard.
Check the machinery
Confirm any certificate, notice, or precondition to deduction was satisfied.
Apply caps and remedies
Establish whether liquidated damages are capped and whether they are the sole remedy.
What the argument is built from.
This head depends on other findings more than any other.
Where these positions fail.
Usually because the date was assumed rather than established.
Extensions were not applied
Deducting from the original date, with extension claims outstanding, overstates the deduction.
The precondition was missed
Where a certificate or notice is required before deduction, deducting without it is a defect in the employer's own process.
The penalty argument is run on the old test
Arguing genuine pre-estimate of loss, without addressing legitimate interest, engages a test the courts have moved past.
Time at large is asserted too quickly
A clear extension mechanism will usually be upheld. Time at large is a narrow argument, not a general answer.
What the Matter Model does with it.
It holds the liquidated damages position against the extension of time findings, so a change to any extension moves the exposure automatically rather than in a later revision.
It keeps the deduction machinery, the certificates, and the notices in the same state as the date itself.
Standards and authorities
- Cavendish Square Holding BV v Makdessi; ParkingEye Ltd v Beavis [2015] UKSC 67
- Triple Point Technology Inc v PTT Public Company Ltd [2021] UKSC 29
- Peak Construction (Liverpool) Ltd v McKinney Foundations Ltd (1970) 1 BLR 111
General reference on how these disputes are argued. Not legal advice, and not a statement of the law of every jurisdiction or seat.
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