The Court held that payment claims lacking the s 13(7) supporting statement are invalid, following the weight of first-instance authority (Kitchen Xchange, Kyle Bay Removals, Duffy Kennedy) over the contrary view of Ball J in Central Projects, but expressly acknowledged the conflict remains unresolved. Where a construction contract provides for milestone payments but does not expressly fix a date on which a progress claim may be made, reference dates are determined under s 8(2)(b) (last day of each named month in which construction work was carried out), not by the date of milestone achievement — meaning successive payment claims served in different months may each be supported by separate reference dates and not contravene s 13(5). The Court also held that s 10(1)(b) valuation of construction work is not engaged where the contract itself determines the progress payment amount for a completed milestone under s 9(a).
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