Can filing valid mechanics' liens constitute intentional interference with contractual relations? ProMax Development Corp. v. Mattson Explained

The Utah Court of Appeals addressed a fascinating question in ProMax Development Corp. v. Mattson: can a party be liable for intentional interference with contractual relations when using otherwise lawful means? The answer is yes, when the predominant purpose is to cause harm.

Background and Facts

ProMax Development built a home for the Mattsons under what became a disputed contract arrangement. The trial court found it was a fixed-price contract for $219,200, despite ProMax’s claim it was a cost-plus arrangement. When construction costs exceeded the budget, the Mattsons were forced to pay $140,000 in overruns from their own funds. After completion, the Mattsons found a buyer willing to pay $560,000 for the home. However, when they refused to let ProMax act as the selling agent, ProMax’s agent threatened to “kill the deal” and encouraged suppliers to file mechanics’ liens against the property, causing the buyer to withdraw.

Key Legal Issues

The primary issue was whether ProMax’s conduct constituted intentional interference with contractual relations when the mechanics’ liens were filed according to statute. The court also addressed whether ProMax could recover under quantum meruit for cost overruns when it failed to inform the Mattsons of budget overages.

Court’s Analysis and Holding

The court held that a party may be liable for interference with contractual relations through either “improper means” or for an “improper purpose.” Even when using lawful means, liability exists if “the actor’s predominant purpose was to injure [the complaining party].” Here, ProMax could have sued to enforce whatever contract it believed existed, but instead used its leverage with suppliers to harm the Mattsons gratuitously. The court rejected ProMax’s quantum meruit claim, finding that when a party breaches by failing to disclose cost overruns, it cannot recover for benefits allegedly conferred.

Practice Implications

This decision clarifies that lawful conduct can still constitute actionable interference when motivated by malice rather than legitimate business purposes. For construction disputes, the case emphasizes the importance of proper disclosure of cost overruns and obtaining client consent before exceeding budgets. The court’s rejection of the quantum meruit claim reinforces that breaching parties cannot benefit from their own wrongful conduct.