Liquidated Damages in Australian Residential Building Contracts

What it is

Liquidated damages (LDs) are a pre-agreed sum the builder must pay the owner for each day the works run past the date for practical completion. The clause does two things at once. It sets a known number that compensates the owner for delay, and it limits the builder's exposure to that number rather than the open-ended damages a court might otherwise award.

LDs are common in residential building contracts in Australia and appear in the standard NSW, QBCC and Victorian forms. The amount is expressed as a dollar rate per day or per week and runs from the day after the date for practical completion until the day actual practical completion is reached.

The pre-estimate of loss test

Australian courts treat LDs as a genuine pre-estimate of the loss the owner is expected to suffer from delay. The principle traces back to Dunlop Pneumatic Tyre Co Ltd v New Garage and Motor Co Ltd [1915] AC 79, which is still the foundation of the Australian doctrine of penalties. If the agreed amount is extravagant or unconscionable compared to the greatest loss that could conceivably follow from the breach, the clause is a penalty and unenforceable.

The High Court refined the test in Andrews v ANZ Banking Group (2012) and Paciocco v ANZ Banking Group (2016), but for residential building work the Dunlop framing is still the everyday reference. The builder's exposure is to compensation, not punishment.

For a residential owner-occupier, the loss typically reflects the holding cost of finance during the delay period, rental and storage paid because the home is not finished, and the cost of alternative accommodation. A daily rate that fairly reflects those categories will hold up; a number plucked from the air can be struck down.

How the rate is set in practice

State standard contracts include a schedule field for the daily LD rate. The QBCC New Home Construction Contract schedule sets a default rate if the parties leave the field blank, and the NSW Building Commission contract leaves the rate open for negotiation with guidance to ensure it is a fair pre-estimate.

A typical residential rate sits between $50 and $500 per day depending on the size of the project, the level of finance carried by the owner, and the difficulty of replacing accommodation in the relevant market. Owners on construction loans often calibrate the rate against actual monthly interest costs converted to a daily figure.

The clause should set out three things clearly. The trigger event (delay past the date for practical completion as extended by valid extensions of time). The daily rate. Any cap on the total amount payable. Caps are common and align the LDs with what a court would accept as proportionate.

State contract caps and consumer protection

The Building Commission NSW and Consumer Affairs Victoria publish guidance recommending that LD clauses are not used as pressure tactics on builders, but as genuine cost recovery mechanisms for owners. Fair Trading NSW's guide on home building delays sets out the owner's right to claim LDs if the builder fails to meet the date for practical completion as extended.

The QBCC standard contract caps liquidated damages at the actual loss suffered, even where the daily rate would otherwise run higher, which mirrors the penalties doctrine. Other state forms achieve a similar result through cap fields in the schedule.

How LDs interact with EOT and delay claims

LDs and extensions of time work as a pair. If the builder is entitled to an EOT for an owner-caused delay or a qualifying event, the date for practical completion moves out and LDs do not start running until the new date is passed. Without a working EOT clause, an LD clause can become unenforceable because the owner is effectively claiming damages for delay the owner caused.

Read this entry with the related entries on delay claims, cost plus versus fixed price contracts and provisional sums to see how the time and money risks fit together.