Williams v Roffey Bros

Williams v Roffey Bros & Nicholls (Contractors) Ltd [1991] 1 QB 1 is a landmark decision of the Court of Appeal in which the court substantially reformulated the doctrine of consideration as it applies to the modification of existing contracts. The case arose from a building subcontract in which the defendant main contractors, Roffey Bros, had engaged the claimant, Mr Williams, a carpenter, to carry out carpentry work on a block of twenty-seven flats in Twerton, near Bath. The agreed price for the subcontract work was £20,000.

Williams encountered financial difficulties during the course of the works. He had originally agreed to perform the carpentry for a price that proved to be too low for him to operate at a profit, and he was also experiencing difficulties in organising his workforce. As a result, the progress of his work slowed considerably. This was a matter of significant concern to Roffey Bros, because their main contract with the building owner contained a time penalty clause: if the works were not completed on schedule, Roffey Bros would themselves become liable to pay liquidated damages to the building owner.

Faced with the prospect of penalty clause liability and the practical inconvenience of finding a replacement subcontractor at short notice, Roffey Bros' representative approached Williams and offered to pay him an additional sum of £10,300, structured as an additional £575 per flat, in order to ensure that he continued with and completed the carpentry works. This oral agreement was reached without any formal variation to the written subcontract. Williams, reassured by the promise of additional payment, continued working on the flats.

Williams subsequently completed work on eight of the remaining flats. Roffey Bros paid him some but not all of the additional sums promised. When Roffey Bros failed to pay further instalments of the agreed additional payment, Williams stopped work and brought an action to recover the outstanding sums. Roffey Bros resisted the claim on the basis that the promise to pay the additional £10,300 was not supported by good consideration in law, since Williams had merely promised to do that which he was already contractually obliged to do under the original subcontract.

At first instance, the recorder found in favour of Williams and awarded him £3,500. Roffey Bros appealed to the Court of Appeal. The appeal was heard by Glidewell, Purchas, and Russell LJJ, each of whom delivered a judgment. The decision of the Court of Appeal, dismissing the appeal and affirming the award in favour of Williams, is now regarded as one of the most significant developments in the English law of contract during the twentieth century.

The central issue before the Court of Appeal was whether the promise made by Roffey Bros to pay Williams an additional sum beyond the original contract price was legally enforceable. This required the court to determine whether Williams had furnished any consideration for that promise, given the established common law rule — derived from Stilk v Myrick (1809) 2 Camp 317 — that a promise to perform, or the performance of, a pre-existing contractual duty owed to the promisor does not constitute good consideration for a new promise by that promisor.

A subsidiary but important issue was whether the law ought to develop the doctrine of consideration in the context of contractual variation to reflect the practical and commercial benefits that a promisor may obtain from a promise to perform a pre-existing contractual duty. The court was therefore required to consider whether "practical benefit" secured by the promisor could qualify as good consideration in law, and if so, under what circumstances.

An ancillary issue concerned the relationship between this doctrinal development and the rule in Stilk v Myrick. The court had to address whether its reasoning departed from, distinguished, or wholly abrogated that earlier authority, and whether the doctrine against economic duress provided a sufficient safeguard against the exploitation of contracting parties in cases where a modification is obtained by pressure rather than genuine agreement.

Glidewell LJ, delivering the leading judgment, began by rehearsing the traditional rule in Stilk v Myrick (1809) 2 Camp 317. That case had established that where a party promises to pay more to a contracting party in exchange for nothing more than performance of obligations already owed under an existing contract, the promise is unenforceable for want of consideration. The rule was long-settled and had been applied for nearly two centuries. Glidewell LJ acknowledged that the rule served an important function in preventing the enforcement of promises extracted by economic pressure.

However, Glidewell LJ noted that the doctrine of consideration had itself evolved over time. He drew attention to the decision of the Court of Appeal in Ward v Byham [1956] 1 WLR 496, in which Denning LJ had suggested that consideration need not move from the promisee in the traditional sense, and that acts already legally required could in some circumstances constitute consideration. Glidewell LJ also referred to Williams v Williams [1957] 1 WLR 148 in a similar vein, observing that the courts had on several occasions adopted a more flexible approach to consideration in the context of pre-existing duties.

Glidewell LJ then turned to the key analytical proposition advanced in the case: that where the promisor, by reason of the promise to perform a pre-existing contractual duty, obtains in practice a benefit — or obviates a disbenefit — that it would not otherwise have secured, that practical benefit is capable of constituting good consideration in law. He formulated the principle carefully, identifying several elements that must be satisfied: the parties must be in an existing contractual relationship; the promisor must have had a reason to doubt whether the promisee would complete performance; the promisor must, as a result of the new promise, have obtained some practical benefit or avoided some detriment; and the promise must not have been given as a result of economic duress or fraud.

Applying this analysis to the facts, Glidewell LJ identified several practical benefits that Roffey Bros had secured by making the promise of additional payment. First, they obtained a greater assurance that Williams would continue and complete the carpentry works. Second, they avoided the trouble and expense of engaging a replacement subcontractor at short notice. Third, and most significantly, they avoided or reduced the risk of incurring liability under the penalty clause in their main contract with the building owner. These practical benefits were real and tangible, even though they were not "new" in the sense of being wholly additional to what the original contract had promised to deliver.

Glidewell LJ was careful to address the tension between this reasoning and Stilk v Myrick. He did not expressly overrule that case, but held that the law had developed since 1809 and that Stilk v Myrick should be confined to cases where the promisor obtains no practical benefit whatsoever from the new promise. On the facts of Williams v Roffey, Roffey Bros plainly did obtain practical benefits, and so the rule in Stilk v Myrick did not apply. The distinction between the two cases lay not in the formal legal position of the parties but in the practical consequences of the promise for the promisor.

Purchas LJ agreed in the result but placed greater emphasis on a different strand of analysis. He observed that the law of contract must be sensitive to the commercial realities of ongoing contractual relationships, and that it would be artificial and commercially unrealistic to refuse to enforce a promise voluntarily made, for good commercial reasons, by a party who subsequently seeks to resile from it. He stressed that the existing doctrine of economic duress — as developed in cases such as Pao On v Lau Yiu Long [1980] AC 614 — provided an adequate safeguard to police the boundary between acceptable re-negotiation and illegitimate pressure, making it unnecessary to insist on the orthodox pre-existing duty rule as a proxy for that protection.

Russell LJ, the third member of the court, also concurred in the result. He expressed the view that the courts should not be too astute to search for the absence of consideration where a promise has been made in a commercial context and both parties have in substance acted upon it. He highlighted the element of good faith in the dealings between Williams and Roffey Bros, noting that the promise of additional payment had been spontaneously offered by Roffey Bros and had not been extracted by any improper pressure on the part of Williams. This factual context was important in distinguishing the case from one in which the pre-existing duty rule might retain its protective function.

An important element of the court's reasoning across all three judgments was the recognition that the doctrine of consideration must work in a coherent and principled relationship with other doctrines of contract law. The court noted that the development of economic duress as a vitiating factor — acknowledged by the House of Lords in Universe Tankships Inc of Monrovia v International Transport Workers' Federation [1983] 1 AC 366 — meant that there was now a more sophisticated mechanism available to police coerced modifications. The rigid pre-existing duty rule was therefore no longer needed as the sole bulwark against exploitative renegotiation.

The court also rejected any suggestion that the Roffey Bros promise could be regarded as a gift or a gratuitous undertaking that would require the formality of a deed to be enforceable. The promise was plainly commercial in character and was made in exchange for the continuation of performance by Williams. It was not mere generosity but a considered commercial response to a practical problem. The presence of practical benefit on the side of the promisor confirmed that this was genuinely reciprocal dealing rather than a gratuitous promise.

The court implicitly approved a more fact-sensitive approach to the identification of consideration. Rather than asking in the abstract whether the promisee had promised to do something beyond an existing legal obligation, the court directed attention to whether the promisor had obtained something of value in fact. This shift from a formal to a substantive enquiry was novel and significant, and the court was aware that it carried the potential to erode the pre-existing duty rule considerably, albeit not to abolish it entirely.

The Court of Appeal, by a unanimous decision, held that the promise made by Roffey Bros to pay Williams an additional £10,300 was supported by good consideration and was therefore legally enforceable. The practical benefits obtained by Roffey Bros — in particular, the avoidance of liability under the penalty clause in their main contract, the continued performance by Williams, and the saving of the expense of engaging a substitute subcontractor — constituted sufficient consideration in law for their promise of additional payment, notwithstanding that Williams had merely promised to perform, and had in part performed, obligations already owed under the original subcontract.

The court further held that, where A has entered into a contract with B to do work for a price, and before the work is complete A has reason to doubt whether B will complete it, and B promises A an additional payment in return for B's promise to complete on time, and as a result of giving that promise A obtains some practical benefit or obviates a disbenefit, and B's promise is not given as a result of economic duress or fraud, then the benefit to A is capable of amounting to consideration for B's promise such that the promise will be legally binding. This formulation, articulated primarily by Glidewell LJ, has become the authoritative statement of the practical benefit principle in English contract law.

The appeal by Roffey Bros was accordingly dismissed, and the award of £3,500 in favour of Williams was affirmed. Although the court declined formally to overrule Stilk v Myrick, the effect of the decision was substantially to limit the scope of that case to circumstances where the promisor obtains no practical benefit whatsoever from the renegotiated promise — a circumstance that will rarely arise in practice.

Williams v Roffey Bros is widely recognised as one of the most important and debated decisions in English contract law of the modern era. By introducing the concept of "practical benefit" as sufficient consideration for a promise to pay more for the performance of an existing contractual obligation, the Court of Appeal effectively transformed the law governing contractual modification. The decision brought English law into closer alignment with commercial realities and has been praised by scholars who regard the pre-existing duty rule as an archaic formalism ill-suited to the needs of contemporary commerce. It has been criticised, however, by those who argue that it undermines the certainty of the consideration doctrine and threatens to collapse consideration into a mere requirement of reasonableness or unconscionability.

A significant limitation on the reach of the decision was identified by the Court of Appeal in Re Selectmove Ltd [1995] 1 WLR 474, where Peter Gibson LJ declined to extend the practical benefit principle to cases involving promises to accept part payment of a debt in full satisfaction of the whole. The court held that the rule in Foakes v Beer (1884) 9 App Cas 605 — a binding House of Lords authority — prevented the adoption of the practical benefit reasoning in that context, since to do so would be to subvert a House of Lords decision by means of a Court of Appeal departure. This created an acknowledged asymmetry in English law: the practical benefit principle applies to promises to pay more for performance, but not to promises to accept less than the full debt.

The relationship between Williams v Roffey