Construction Delay & Variation Dispute Lawyers — All States
Construction Delay Dispute Lawyers — EOT. Liquidated Damages. Variation Claims.
Construction delay and variation disputes are among the most complex and highest-value building disputes in Australia. Whether you are a builder claiming an extension of time and delay costs, or an owner deducting liquidated damages for late completion, the contract terms, the notice requirements, and the causation analysis are critical. A building lawyer advises on the prospects of the claim and the most efficient path to resolution.
⚠ Most building contracts require the builder to give notice of a delay claim within a specified time of the delay event occurring — failing to give notice on time can result in the right to an extension of time being lost. Get advice immediately if a delay event has occurred.
Construction Delay Law
Extension of time, liquidated damages, and variation disputes
Construction delay disputes arise when a building project takes longer to complete than the contract allows. The key questions are: (1) whose fault is the delay; (2) is the builder entitled to an extension of time (EOT) under the contract; and (3) if the builder is not entitled to an EOT, is the owner entitled to deduct liquidated damages (LDs) for every day of delay beyond the contractual completion date.
Extension of time clauses in building contracts typically allow the builder to claim additional time for completion in specified circumstances — including owner-directed variations, delays caused by the owner (or owner-engaged parties), latent conditions, and adverse weather. Most EOT clauses require the builder to give written notice of the delay claim within a specified time of the delay event occurring — typically 10–14 days. A notice requirement that is a condition precedent to the EOT right means that failure to give notice on time forfeits the EOT right entirely, regardless of how good the underlying claim is.
Liquidated damages (LDs) are pre-agreed amounts payable by the builder for every day of delay beyond the contractual completion date — as specified in the contract. The owner can deduct LDs from progress payments or recover them from the builder after practical completion. However, the LD clause is only enforceable if it is a genuine pre-estimate of the owner's loss caused by delay — not a penalty imposed to punish the builder. Since Paciocco v Australia and New Zealand Banking Group Ltd [2016] HCA 28, the High Court has confirmed that the test for a penalty is whether the stipulated consequence is disproportionate to the legitimate interests of the party imposing it.
Variations are changes to the scope of work — either directed by the owner or proposed by the builder and accepted by the owner. Most building contracts require all variations to be in writing and priced before the work is done — verbal variations are often unenforceable under the contract, though the builder may have a claim in quantum meruit for the fair value of the work done.
Delay & Variation Matters
Construction delay and variation disputes we handle
Extension of time claims
Advising builders on the grounds for an EOT claim, the notice requirements, and the evidence needed to establish that the delay was caused by an event entitling the builder to additional time.
Liquidated damages disputes
Advising owners on the right to deduct LDs for delay, and advising builders on challenging LD deductions — including the enforceability of the LD clause and the prevention principle.
Disputed variation claims
Advising builders and owners on disputed variation claims — including whether work was within the original scope, whether the variation was properly authorised in writing, and the pricing of variations where the rate has not been agreed.
Concurrent delay
Analysis of concurrent delay — where both the owner and the builder have contributed to the delay — and the apportionment of responsibility for the delay and any resulting LD deductions.
The prevention principle
The "prevention principle" prevents an owner from deducting LDs for a period of delay that the owner caused — advising builders on invoking the prevention principle where the owner has contributed to the delay.
Delay cost claims
Quantifying and recovering the builder's delay costs — including prolongation costs (extended site overheads), acceleration costs (additional labour to catch up), and loss of productivity — caused by owner-caused delays or owner-directed variations.
Frequently Asked Questions
Construction delay and variation questions answered
What is the 'prevention principle' in construction delay disputes?
The prevention principle prevents the owner from relying on the liquidated damages clause to recover damages for delay that the owner caused — by directing variations after the completion date, refusing site access, or failing to supply owner-supplied materials. If the owner's conduct prevented timely completion, the contractual completion date may become "at large," meaning the builder only needs to complete within a reasonable time.
Can the builder claim for variations not authorised in writing?
Most building contracts require written authorisation for variations. Where no written authorisation was given, the builder typically cannot claim under the contract — but may have a quantum meruit claim for the fair value of the work done, if the owner requested the work and it would be unjust to retain the benefit without payment.
Are liquidated damages always enforceable?
Not always. Since Paciocco v ANZ Banking Group [2016] HCA 28, a LD clause is enforceable if the rate is a genuine pre-estimate of loss caused by delay — not disproportionate to the owner's legitimate interests. A LD rate that is unconscionably large relative to actual loss risks being characterised as an unenforceable penalty.