A building owner who unilaterally insists on conditions not warranted by the contract as prerequisites to making progress payments engages in repudiatory conduct entitling the builder to terminate. Section 58(1)(a) of the Queensland Building Services Authority Act 1991 does not invalidate a building contract merely because one of two consumers failed to sign it; the penalty in s 58(4) is the sole consequence. A party who has been held out as a contracting party throughout proceedings cannot raise the issue of their non-party status for the first time on appeal.
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