What Are Liquidated Damages (LDs)?
Liquidated damages (LDs) are a fixed daily or weekly dollar amount, agreed in the contract before work even begins, that a contractor pays to the client for every day the works run late past the date for practical completion. LDs exist to give both parties certainty about the cost of delay without either side having to prove and argue actual loss after the event, and they are usually capped at a maximum amount and stop accruing once practical completion is certified.
Key takeaways
- Liquidated damages (LDs) are a pre-agreed rate, usually per day or week, charged for finishing later than the contracted date for practical completion.
- To be enforceable, LDs must be a genuine pre-estimate of the client’s likely loss from delay — a rate set punitively high risks being struck down as an unenforceable penalty.
- LDs are almost always capped at a maximum, commonly expressed as a percentage of the contract sum, so exposure has a ceiling.
- LDs start accruing the day after the date for practical completion (as extended by any approved extension of time) and stop once PC is certified.
- A properly managed extension of time process is the contractor’s main protection against LDs — every genuine delay needs to be claimed, not just noted.
What are liquidated damages?
Liquidated damages are a dollar figure, fixed in the contract at the time it is signed, that becomes payable by the contractor for each day (or week) the works remain incomplete beyond the date for practical completion. Rather than the client having to prove in hindsight exactly how much a delay actually cost them — lost rent, holding costs, alternative accommodation, finance charges — the parties agree the rate up front, and it applies automatically if the job runs late.
That certainty is the whole point of an LD clause. Both sides know the cost of delay before the job starts: the client does not need to litigate their actual loss, and the contractor knows precisely what a late finish will cost them, which can be factored into how hard they push the program.
For an LD clause to be enforceable, the rate must be a genuine pre-estimate of the loss the client is likely to suffer from delay, assessed at the time the contract was signed. A rate set deliberately high to punish or pressure the contractor, rather than to reflect a realistic estimate of loss, risks being struck down by a court as an unenforceable penalty — in which case the client would need to fall back on proving actual, unliquidated damages instead.
In plain terms
Liquidated damages are an agreed "late fee" for a construction job — a set dollar amount per day the job runs over, fixed in the contract before work starts, instead of arguing about the actual cost of the delay after the fact.
What liquidated damages typically cover
The LD rate is meant to approximate the real costs a client is likely to bear if the works are not ready by the contracted date, even though it is expressed as a single flat figure rather than an itemised claim. Common costs behind a typical LD rate include:
- Holding costs — finance or interest costs on funds tied up in the project while it remains incomplete.
- Lost rent or income — where the completed building was due to be leased, sold or brought into use by a set date.
- Alternative accommodation or storage — costs the client incurs because they cannot yet occupy or use the completed works.
- Additional project management or consultant costs — fees for the client’s own team or superintendent for the extra period the project runs.
How liquidated damages are calculated and capped
The mechanics are straightforward once the rate is set: the number of days between the date for practical completion (as extended by any approved extension of time) and the actual, certified PC date is multiplied by the agreed daily or weekly rate. Almost every LD clause also sets a maximum cap, commonly expressed as a percentage of the contract sum, so a contractor’s total exposure to LDs on a single job has a defined ceiling rather than growing indefinitely.
| Item | Detail | Amount |
|---|---|---|
| Agreed LD rate | $800 per calendar day | $800/day |
| Days late | Actual PC minus extended date for PC | 18 days |
| LDs accrued | 18 days × $800 | $14,400 |
| LD cap | 10% of $650,000 contract sum | $65,000 |
When liquidated damages start and stop accruing
LDs start accruing the day immediately after the date for practical completion — not the original tender program date, but that date as adjusted by any extensions of time the contractor has been granted along the way. They continue to accrue, day by day or week by week, until practical completion is actually certified.
The moment PC is certified, LDs stop accruing entirely, which is one of several reasons the actual PC date is so often contested: it is the single date that both closes off a contractor’s exposure to LDs and starts the defects liability period running.
Liquidated damages and extensions of time
The extension of time (EOT) process is the contractor’s main defence against LDs. Where a delay is caused by the client, a variation, inclement weather covered by the contract, or another qualifying event, the contractor can claim an EOT that pushes back the date for practical completion — and every day of an approved EOT is a day LDs cannot be charged against.
If the client causes a significant delay that the contract has no mechanism to properly extend for, some contracts and case law recognise that time can become "at large" — meaning the fixed completion date, and with it the LD clause, may no longer strictly apply, and the contractor instead only needs to complete within a reasonable time. That outcome is contract- and jurisdiction-specific, which is exactly why documenting delays and lodging EOT claims properly matters far more than arguing about it after the event.
Who administers liquidated damages
The superintendent, principal’s representative or contract administrator is generally responsible for assessing the actual date of practical completion and certifying it, which fixes the number of days (if any) that LDs apply to. From there, the client typically deducts the LDs owed from the contractor’s next progress claim or from retention, or issues a separate claim for the amount.
A contractor managing LD exposure needs a live view of the program against the contracted date for PC, so any slippage is visible early enough to lodge an EOT claim in time — most contracts set a strict notice period for raising a delay, and missing it can forfeit the right to claim time back at all.
Liquidated damages vs other terms
LDs are frequently confused with related concepts, but each one is legally and practically distinct:
- LDs vs a penalty — LDs must be a genuine pre-estimate of likely loss to be enforceable; a rate set to punish rather than compensate is a penalty and is generally unenforceable.
- LDs vs unliquidated (general) damages — LDs are a pre-agreed figure that applies automatically; unliquidated damages require the client to prove their actual loss, which is slower and less certain for both sides.
- LDs vs retention — retention is cash security held against progress payments for completion and defects; LDs are a separate daily-rate deduction specifically for late completion.
- LDs vs extension of time — an EOT adjusts the date LDs are measured from; it is the mechanism that reduces or removes LD exposure, not a form of damages itself.
Common mistakes with liquidated damages
Most LD disputes come down to a handful of recurring, avoidable issues:
- Setting an LD rate that is not a genuine pre-estimate of loss, risking the whole clause being struck down as an unenforceable penalty.
- Not lodging extension of time claims promptly, or at all, and losing the ability to push back the date LDs are measured from.
- Losing track of the LD cap and assuming exposure is unlimited, when most contracts fix a maximum.
- Disputing the certified PC date long after the fact, without a contemporaneous paper trail to support an earlier completion date.
- Confusing LDs with retention or general damages when reviewing a contract, and misunderstanding real financial exposure on a job.
How My Trade Hub helps manage liquidated damages exposure
My Trade Hub keeps the priced scope, program-linked preliminaries and variation history for a project in one place from the original tender onward, so a builder can see clearly how a variation or a delay is likely to affect the completion date — and whether an extension of time claim is warranted — well before it becomes a dispute over liquidated damages.
Because every variation stays tied back to the original measured Bill of Quantities and its time impact, you have a defensible, documented record to support an EOT claim if a job does run late, rather than trying to reconstruct what happened and why months after the event.
Frequently asked questions
What are liquidated damages in a construction contract?
Liquidated damages (LDs) are a pre-agreed dollar amount per day or week, fixed in the contract before work begins, that the contractor pays the client for finishing later than the contracted date for practical completion. They are usually capped at a maximum amount.
How are liquidated damages calculated?
The number of days between the contracted (as extended) date for practical completion and the actual, certified PC date is multiplied by the agreed daily or weekly LD rate, up to whatever cap the contract sets.
Can liquidated damages be challenged as a penalty?
Yes. For an LD clause to be enforceable, the rate must be a genuine pre-estimate of the client’s likely loss from delay, made at the time the contract was signed. A rate set purely to punish the contractor risks being struck down as an unenforceable penalty.
When do liquidated damages stop accruing?
LDs stop accruing the moment practical completion is certified. They start again from zero on any future project — they are not a running penalty beyond the specific late-completion period on that job.
What is the difference between liquidated damages and retention?
Retention is money withheld from progress payments as security for completion and defects, released later in stages. Liquidated damages are a separate daily-rate charge specifically for finishing the works late, deducted independently of retention.
Do liquidated damages have a maximum limit?
Almost always, yes. Most construction contracts cap total LDs at a stated maximum, commonly expressed as a percentage of the contract sum, so a contractor’s exposure to delay costs on a single job is not open-ended.
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