Background
Hanna Lucine Gunson and Christopher James Gunson commenced proceedings against Exclusive Building Tas Pty Ltd and two individual directors for misleading or deceptive conduct under the Australian Consumer Law and trespass to land. In October 2025, the Gunsons applied for leave to amend their pleading to add a new cause of action for breach of contract. A primary judge granted the amendment despite Exclusive Building’s opposition based on delay and opportunity to plead earlier. Exclusive Building then sought leave to appeal from that interlocutory judgment.
The Gunsons contended the amendment was necessary to prevent an issue estoppel at trial regarding whether damages could be assessed, and that allowing the amendment would serve the interests of justice by resolving all issues between the parties expeditiously. Exclusive Building argued the Gunsons had ample opportunity to plead breach of contract since February 2025 (when building defects were first raised) and that the late amendment would require vacation of the fixed trial date, causing prejudice and inconvenience.
The Court’s Holding
Justice Rangiah dismissed Exclusive Building’s application for leave to appeal. The Court held that the primary judge correctly applied the principles established in Aon Risk Services Australia Ltd v Australian National University, which requires courts to consider not merely the interests of the parties but also the interests of the Court and other litigants in determining whether to permit amendments to pleadings. The primary judge properly exercised her discretion by considering all of Exclusive Building’s submissions—including arguments about the Gunsons’ failure to plead the cause of action at an early stage, the absence of a satisfactory explanation for delay, and claims of improper purpose in joining the individual directors.
Justice Rangiah found that the primary judge did not err in concluding that the interests of justice favored allowing the amendment. Although there was a delay and the Gunsons’ conduct was acknowledged as “less than satisfactory,” the primary judge was entitled to permit the amendment because it would enable all issues in controversy to be determined finally without creating an issue estoppel, and because the trial date itself was not caused to be vacated by the amendment application (it had already been adjourned due to default by both parties).
The Court confirmed that Exclusive Building would have a full opportunity to defend the breach of contract claim at trial and could raise any objection to the grant of leave to amend as a ground of appeal from the final judgment under s 24(1E) of the Federal Court of Australia Act 1976 (Cth). The Court ordered the Gunsons to pay the respondents’ costs of the appeal application.
Key Takeaways
- Late amendments to pleadings are not automatically granted on payment of costs; the Court must weigh systemic interests including impact on trial dates, other litigants, and timely resolution against interests of the parties.
- A party’s failure to provide an on-oath explanation for delay does not necessarily preclude amendment if the Court finds that the interests of justice otherwise favor allowing it.
- When an issue estoppel would result from refusing an amendment—preventing final resolution of a material issue—this can weigh in favor of permitting the amendment even if it is late.
- A question of whether an amendment caused trial adjournment is a contested factual question for the primary judge; appellate courts exercise caution in interfering with procedural discretions without clear error.
Why It Matters
This decision reinforces the post-Aon framework for amendments in Australian federal civil litigation. It clarifies that courts must balance competing interests in determining whether to permit amendments—not treating amendments as a right subject only to a costs award, but as a discretionary matter turning on broader considerations of just, timely, and cost-effective dispute resolution. The decision rejects a narrow “prejudice + costs” test and instead applies a holistic analysis that includes case management, impact on court resources, and the progress of litigation toward trial.
For practitioners, the decision demonstrates that while delay and failure to seize early opportunities to amend weigh against a party, they are not dispositive. Courts may still permit late amendments if doing so better serves the overall interests of justice—such as preventing issue estoppels that would fragment liability findings or ensure comprehensive resolution. The decision also confirms that interlocutory decisions on amendments receive deferential appellate review; leave to appeal will not be granted absent a clear error of principle or manifest unreasonableness.