Codelfa Construction Pty Ltd v State Rail Authority of New South Wales

Facts

Codelfa Construction Pty Ltd was engaged by the State Rail Authority of New South Wales to excavate tunnels for the Eastern Suburbs Railway in Sydney. Codelfa assumed it could work three shifts per day, seven days a week, but an injunction obtained by nearby residents restrained night and Sunday work, making the contract substantially more onerous and unprofitable. Codelfa sought additional payment, arguing either an implied term entitled it to extra remuneration or, alternatively, that the contract had been frustrated.

Issues

1. Whether the contract was frustrated by the injunction restraining the work schedule contemplated by both parties at the time of contracting. 2. Whether extrinsic evidence of surrounding circumstances is admissible to assist in the construction of a written contract. 3. Whether an implied term could be established entitling Codelfa to additional remuneration.

Holding

The High Court held, by majority, that the contract had been frustrated because the injunction destroyed the common assumption on which the contract was based, and that Codelfa was accordingly entitled to a quantum meruit for work performed. The Court also confirmed the admissibility of surrounding circumstances evidence as an aid to contractual construction.

Ratio decidendi

A contract is frustrated when a supervening event, not caused by either party and not within the contractual allocation of risk, so significantly changes the circumstances that performance would be radically different from that which was undertaken. In construing a written contract, evidence of the surrounding circumstances known to both parties at the time of contracting is admissible to assist in determining the meaning of the contract, but direct evidence of the parties' subjective intentions or prior negotiations is not admissible for that purpose — this is Mason J's 'true rule' of construction.

Obiter dicta

Mason J stated, in widely cited obiter, that where the words of a contract are unambiguous, evidence of surrounding circumstances cannot be used to contradict or vary their plain meaning; the admissibility of such evidence is directed to assisting the court to understand the context in which the words were used, not to alter their effect. Mason J also discussed the distinction between frustration and hardship, noting that mere unprofitability does not amount to frustration.

Significance

Codelfa is the foundational Australian authority on both the doctrine of frustration and the admissibility of surrounding circumstances in contractual construction, and Mason J's 'true rule' has been applied and debated in every subsequent major construction case in Australian courts, including the High Court's reconsideration in Electricity Generation Corporation v Woodside Energy Ltd (2014) 251 CLR 640.

Key authorities

• Davis Contractors Ltd v Fareham Urban District Council Davis Contractors Ltd v Fareham Urban District Council [1956] AC 696applied
• Prenn v Simmonds Prenn v Simmonds [1971] 1 WLR 1381considered
• Reardon Smith Line Ltd v Yngvar Hansen-Tangen Reardon Smith Line Ltd v Yngvar Hansen-Tangen [1976] 1 WLR 989applied
• Fibrosa Spolka Akcyjna v Fairbairn Lawson Combe Barbour Ltd Fibrosa Spolka Akcyjna v Fairbairn Lawson Combe Barbour Ltd [1943] AC 32considered
• BP Refinery (Westernport) Pty Ltd v Shire of Hastings BP Refinery (Westernport) Pty Ltd v Shire of Hastings (1977) 180 CLR 266applied
• Scanlan's New Neon Ltd v Tooheys Ltd Scanlan's New Neon Ltd v Tooheys Ltd (1943) 67 CLR 169considered