75 In Coordinated Construction Co Pty Ltd v J M Hargreaves (NSW) Pty Ltd [2005] NSWCA 228, Hodgson JA expressed the view, albeit tentatively, that if an adjudicator determined a progress payment at the amount claimed simply because he or she rejected the relevance of the respondent's material, that could be such a failure to address the task (of determining the amount of the progress payment to be paid, which requires determination on the material available and to the best of the adjudicator's ability of the amount properly payable), as to render the determination void. His Honour said:-
50 Before concluding, I wish to note what I believe may be an important error in the judgment of the primary judge, not bearing on the outcome of the case. In the second half of para.[51] of his judgment, the primary judge said this:
An adjudicator is bound to consider the provisions of the Act, the provisions to the construction contract, the payment claim and payment schedule and submissions made by the claimant and respondent respectively and the results of any inspection: s 22(2). It seems to follow from all this that, if the point that an amount claimed is not "for" construction work is not taken in the payment schedule, it cannot thereafter be relied upon by the respondent in the adjudication process. The adjudicator would be bound to determine the matter on the basis of the material to which she or he could properly have regard; and if the adjudicator decided that all the reasons advanced by the respondent were invalid, the adjudicator would determine the amount of the progress payment in favour of the claimant.
51 That passage could be read as asserting that, if a respondent to a payment claim does not raise any relevant grounds for denying or reducing the progress claim made by the claimant, then the adjudicator automatically determines the progress claim at the amount claimed by the claimant. My tentative view is that such an assertion would be incorrect.
52 The task of the adjudicator is to determine the amount of the progress payment to be paid by the respondent to the claimant; and in my opinion that requires determination, on the material available to the adjudicator and to the best of the adjudicator's ability, of the amount that is properly payable. Section 22(2) says that the adjudicator is to consider only the provisions of the Act and the contract, the payment claim and the claimant's submissions duly made, the payment schedule and the respondent's submissions duly made, and the results of any inspection; but that does not mean that the consideration of the provisions of the Act and the contract and of the merits of the payment claim is limited to issues actually raised by submissions duly made: see The Minister for Commerce v. Contrax Plumbing (NSW) Pty. Ltd. [2005] NSWCA 142 at [33]-[36]. The adjudicator's duty is to come to a view as to what is properly payable, on what the adjudicator considers to be the true construction of the contract and the Act and the true merits of the claim. The adjudicator may very readily find in favour of the claimant on the merits of the claim if no relevant material is put by the respondent; but the absence of such material does not mean that the adjudicator can simply award the amount of the claim without any addressing of its merits.
53 Indeed, my tentative view is that, if an adjudicator determined the progress payment at the amount claimed simply because he or she rejected the relevance of the respondent's material, this could be such a failure to address the task set by the Act as to render the determination void.
76 That is what the Owners complain has happened here. However Basten JA, without deciding, expressed a different view. His Honour said:-
64 At [50]-[53] Hodgson JA takes issue with a passage in the judgment of McDougall J below, part of which is set out at [50]. In substance the issue in dispute, as I understand it, is this: if, on a proper construction of the Act and the contract, the adjudicator comes to the view that a particular item in the payment claim is not justified, he or she will nevertheless be required to allow the item if an appropriate objection was not taken by the respondent in its payment schedule. In the passage from the judgment below, set out at [50] above, reliance for this conclusion would appear to be rooted squarely in s 22(2) of the Act. However, when read in context, the primary judge expressly placed weight upon a number of other provisions of the Act, to which attention should be given. Before turning to those, it is convenient to note the scope and operation of s 22(2). The provision is set out in full at [29] above.
65 According to the well-known principles governing judicial review under the general law, a decision-maker will fail to exercise a statutory power if he or she fails to take into account a mandatory consideration. Similarly, there will be a failure properly to exercise the statutory jurisdiction where the decision-maker takes into account an impermissible consideration. The same principles are found in the Administrative Decisions (Judicial Review) Act 1977 (Cth), discussed by Mason J in Minister for Aboriginal Affairs v Peko Wallsend Ltd (1986) 162 CLR 24 at 39-40. As his Honour noted (at p.40), many statutory discretions are in their terms unconfined and the considerations will therefore be unconfined "except in so far as there may be found in the subject-matter, scope and purpose of the statute some implied limitation on the factors to which the decision-maker may legitimately have regard …". Section 22(2) of the Act is an exception to this rule: indeed, it has a dual function. On the one hand, it prescribes matters to which the adjudicator is required to have regard; on the other hand, it identifies those matters as the "only" matters to which the adjudicator is to have regard. At least on its face, the list is exhaustive.
66 If that were the whole of the story, the conclusion suggested by Hodgson JA, namely that the adjudicator would be entitled to disallow an item on the basis of the contract and the nature of the claim made, would be made good. The fact that the payment schedule prepared by the respondent did not identify the reason for disallowance would not mean that the adjudicator had failed to take account of a mandatory consideration, or had had regard to an impermissible consideration. However, McDougall J based his reasoning to a contrary conclusion in part on other statutory provisions, in addition to s 22(2), including ss 14(3) and 20(2B). Sub-section 14(3) requires that where a payment schedule indicates an amount of a payment which is less than that the amount of the claim, the schedule must indicate why the amount is less and, if a respondent is withholding payment, the reason for that action. Where the payment schedule indicates an amount which is less than the amount claimed, the claimant may apply for adjudication of its payment claim: s 17(1)(a). Where such an application is made, the respondent may lodge a response to the claimant's adjudication application. That response may contain relevant submissions (s 20(2)(c)), but, subs (2B) provides:
"The respondent cannot include in the adjudication response any reasons for withholding payment unless those reasons have already been included in the payment schedule provided to the claimant."