Quantum meruit — Latin for "as much as he has deserved" — is a restitutionary remedy in common law jurisdictions that permits a claimant to recover the reasonable value of work performed or services rendered to a defendant who would otherwise be unjustly enriched. It operates where an express contract is absent, void, unenforceable, or has been discharged, but the recipient has nonetheless accepted a benefit under circumstances suggesting payment was expected.
The doctrine traces to early English common law and is conventionally treated as one of the common counts in assumpsit. Modern courts typically frame it as a claim in unjust enrichment or quasi-contract rather than in contract proper. To succeed, a claimant generally must show: (1) services were rendered to the defendant; (2) the services were accepted, used, or enjoyed; (3) the circumstances reasonably notified the defendant that the claimant expected to be paid; and (4) it would be inequitable to allow the defendant to retain the benefit without compensation.
Quantum meruit is distinct from quantum valebat (the analogous claim for goods supplied) and from damages for breach of contract, which protect the expectation interest. Recovery under quantum meruit is measured by the reasonable market value of the services, not the profit the claimant would have made under the failed bargain.
Leading authorities include the English case Planché v. Colburn (1831), where an author recovered for partial work when the publisher abandoned the project, and Australian decisions such as Pavey & Matthews Pty Ltd v. Paul (1987) 162 CLR 221, which grounded the action firmly in unjust enrichment. In the United States, the Restatement (Third) of Restitution and Unjust Enrichment (2011) treats quantum meruit as a measure of restitution rather than a freestanding cause of action.
The doctrine is frequently invoked in construction disputes, professional services engagements, and cases where parties begin performance before finalising contract terms — a common scenario in transnational commercial practice.
Example
In *Pavey & Matthews Pty Ltd v. Paul* (1987), the High Court of Australia allowed a builder to recover on quantum meruit for renovation work despite the underlying oral contract being unenforceable under the Builders Licensing Act.
Frequently asked questions
Modern courts in Australia, the UK, and the US generally classify it as a restitutionary claim grounded in unjust enrichment rather than contract, though it historically arose through the writ of assumpsit.
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