A vendor who reserves rights regarding disputed contractual amendments while affirming reliance on the contract terms is not thereby 'in default' so as to be precluded from serving a notice to complete. A settlement statement delivered after a notice to complete that contains an erroneous calculation does not retrospectively invalidate the notice. Settlement statements are matters of practical convenience, not contractual obligation, and courts should be slow to treat them as unequivocal adoptions of a particular contractual construction.
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