The Court held that where parties to a verbal construction contract agree by email exchange to vary the payment rate, and the claimant issues a revised invoice at the reduced rate, the revised invoice remains a payment claim under the original construction contract (as varied) rather than a claim under a separate non-construction arrangement. The earlier invoice is treated as withdrawn by necessary implication, so the revised invoice does not contravene s 13(5) of the Building and Construction Industry Security of Payment Act 1999 (NSW). The Court also held that the adjudicator adequately engaged with the respondent's defective work submission, finding the adjudicator was not satisfied the work was of nil value and, absent any alternative valuation from the respondent, properly valued the work at the contract rates.
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