Where a builder breaches an implied term to supply high quality materials, the ordinary measure of damages is the cost of rectification to achieve conformity with the contract, even where the building is structurally sound and the defects are primarily aesthetic. The unreasonableness qualification from Bellgrove v Eldridge, as explained in Tabcorp, applies only in fairly exceptional circumstances where the innocent party is using a technical breach to secure an uncovenanted profit. The defendant bears the onus of proving facts relevant to the unreasonableness qualification, and failure to cross-examine the plaintiff on intention to use damages for rectification may preclude reliance on that qualification.
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