Downer Construction (Australia) Pty Ltd v Energy Australia

In the New South Wales Court of Appeal, Downer Construction (Australia) Pty Ltd appealed against decisions concerning the adjudication of payment claims under the *Building and Construction Industry Security of Payment Act 1999* (NSW). The dispute arose from a construction contract between Downer Construction and Energy Australia, where Downer sought payment for work performed. Energy Australia had issued a payment schedule in response to Downer's payment claim.

The primary legal issues before the Court of Appeal were whether an adjudicator's determination was invalid if the payment claim addressed in the adjudicator's submissions differed in substance from the payment claim identified in the adjudication application, and whether an adjudicator's decision, even if reasonable but erroneous, could invalidate the adjudication process. The court also considered the implications of latent conditions under the contract.

The Court of Appeal held that for an adjudication application to be valid, it must clearly identify the payment claim and payment schedule to which it relates. If the substance of the claim addressed in the adjudicator's submissions deviates significantly from the identified payment claim, the adjudicator may exceed their jurisdiction. The court further clarified that while an adjudicator is entitled to make a reasonable decision, an erroneous decision that goes beyond the scope of the application or the identified claim can invalidate the adjudication. The court allowed the appeal and dismissed the summons, setting aside previous orders.