Doueihi v Construction Technologies Australia Pty Ltd

The appeal concerned a dispute between the appellants, who were co-owners of a parcel of land, and the respondent company, Construction Technologies Australia Pty Ltd. The director of the respondent company, who had a close familial connection to three of the four appellant co-owners, initiated discussions regarding the acquisition of the land by the appellants and a subsequent lease of a portion of that land to the respondent. The appellants permitted the respondent's director to oversee the design and construction of a purpose-built building on the land to house the respondent's manufacturing plant. The appellants were aware that the respondent installed expensive manufacturing plant and equipment, which would be costly to dismantle and remove. While the parties had agreed on key terms such as rent, term, option to renew, and the area to be occupied, the respondent's right of occupation was not formally documented. The primary judge had made a factual finding that the respondent had assumed an interest in the land would be granted.

The court was required to determine whether the respondent had made a sufficient assumption of an interest in the land to found a claim of proprietary estoppel, and whether the primary judge's factual finding regarding this assumption was correct. The court also considered the nature of the assumption required to establish proprietary estoppel, particularly in circumstances where the parties may not have intended to enter into a formal lease, and whether this differed from an assumption as to a particular legal relationship. Further issues included the reasonableness and certainty of the respondent's assumption, the adequacy of the assurances provided by the appellants, and whether the respondent's reliance on its assumption was reasonable and its departure unconscionable, given the lack of certain commercial terms in the agreement.

The court reasoned that the principles of proprietary estoppel could apply even in the absence of a formal contract, particularly in contexts involving familial relationships where formal documentation might not be anticipated. The court distinguished the present case from situations where a specific legal relationship is assumed, focusing instead on the assumption that an interest in land would be granted. The court found that the appellants' conduct, including allowing the respondent to oversee construction and install expensive equipment, coupled with the familial connection and the agreed terms, supported the respondent's assumption that it would be granted a right to occupy the land. The court held that the respondent's belief was not merely a hope but a confident expectation based on the circumstances, and that it was reasonable for the respondent to rely on this assumption, making it unconscionable for the appellants to depart from it.

The appeal was dismissed, and the appellants were ordered to pay the respondent's costs.