A builder who fails to follow contractual procedures for claiming variations (requiring written instruction and approval by the architect) has no direct contractual entitlement to payment and cannot recover in quantum meruit or unjust enrichment where the work is part and parcel of the contract works and an enforceable contract covers the situation. Where an architect is available to both parties but not called, Jones v Dunkel inferences may be drawn against whichever party bears the onus on the particular issue.
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