Henderson v Miles (No 2)

In the case of Henderson v Miles (No 2), the plaintiffs sought to recover equity from the defendants, who were their daughter and son-in-law. The plaintiffs had built a dwelling on the defendants' land, but the relationship between the parties deteriorated, leading to the plaintiffs seeking to reclaim their equity. The dispute was heard in the Supreme Court of South Australia. The primary legal issue before the court was the appropriate remedy in cases where there has been an unconscionable retention of a "windfall equity" by the defendants. Specifically, the court had to determine whether the plaintiffs were entitled to the minimum equity necessary to remedy the unconscionable retention by the defendants, who had benefited from the plaintiffs' investment in the property without any attributable blame.

The court considered the principles involved in determining an appropriate remedy in "windfall equity" cases, noting that the general preference is to remedy the detriment suffered in reliance on a promise rather than fulfilling the expectation. However, in this instance, there was no relevant detriment suffered by the plaintiffs, and thus, the focus shifted to whether it would be unconscionable for the defendants to retain the windfall. The court concluded that it would indeed be unconscionable for the defendants to retain the windfall equity and thus, the plaintiffs were entitled to a charge for the increase in value of the defendants' land. This decision underscores the court's commitment to preventing unjust enrichment where one party has unfairly benefited at the expense of another.

The court's reasoning was grounded in the principles of equity and unconscionability, finding that the defendants had unconscionably retained the equity that resulted from the plaintiffs' investment in the property. The court did not find it necessary to award the full amount of equity to the plaintiffs, but rather, the minimum equity necessary to remedy the unconscionable retention. This approach ensures that the defendants are not unjustly enriched while also acknowledging the plaintiffs' investment and contributions. The final orders of the court mandated that the defendants pay a charge to the plaintiffs for the increase in value of the land, reflecting the court's determination that the defendants should not retain the windfall equity without contributing appropriately.