"Subject to Contract" Negotiations and the Formation of Binding Agreements

Why It Matters

The ruling shows that parties in high‑stakes infrastructure projects can be legally bound before a formal contract is executed, heightening exposure to unintended obligations. It forces companies to enforce strict “subject to contract” discipline throughout negotiations to manage risk.

Key Takeaways

• Court found binding agreement despite “subject to contract” label
• Absence of heading and removal of reservations signaled waiver
• Later escrow contract did not supersede earlier binding letter
• Energy firms must preserve “subject to contract” wording throughout negotiations

Pulse Analysis

In English contract law, the phrase “subject to contract” is intended to keep negotiations non‑binding until a formal document is signed. Recent case law, however, makes clear that this label is not an absolute shield. The GMC Utilities v Sumitomo Electric decision illustrates how courts apply an objective test, looking at the parties’ conduct and the language of each communication. When a party accepts core terms without restating the “subject to contract” qualifier, the condition can be deemed waived, turning a provisional exchange into a legally enforceable contract.

The court’s analysis hinged on three factual cues: the acceptance paragraph in the November 8 letter explicitly confirmed the offer; the correspondence lacked any “subject to contract” heading after that point; and the letter omitted the reservation of rights present in the prior draft. These indicators signalled a clear intention to be bound, prompting the judge to treat the letter as a complete agreement. For energy and infrastructure firms, where negotiations are rapid and stakes are high, this underscores the danger of informal drafts becoming de‑facto contracts if not carefully managed.

Practically, the ruling advises companies to embed “subject to contract” language in every email and letter throughout a negotiation cycle, and to include explicit waiver clauses if they wish to move beyond the provisional stage. Additionally, any subsequent formal agreement should contain a clear supersession clause to avoid ambiguity about earlier interim arrangements. By tightening drafting discipline and monitoring the evolution of correspondence, firms can mitigate the risk of unintended liability while still advancing complex projects efficiently.