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ACE Autobody Ltd v Motorpark Ltd & Ors [2026] IESC 9 — agreement for lease, waiver, proprietary estoppel and part performance
In ACE Autobody Limited v Motorpark Limited & Ors [2026] IESC 9, the Supreme Court allowed Motorpark’s appeal and set aside the decision of the Court of Appeal. The Court held that the parties’ dealings did not give rise to a concluded agreement for lease, emphasising that commercial parties are “masters of their contractual fate” and that occupation and expenditure undertaken in anticipation of agreement do not create a contract where consensus is absent.
The Supreme Court also rejected ACE’s proprietary estoppel claim, concluding that ACE had not established an equity the Court should protect in the context of legally advised commercial negotiations.
Background
In 2016, ACE Autobody Ltd (ACE) and Motorpark Limited (Motorpark) began negotiations for a proposed 10‑year lease of part of Motorpark’s commercial premises, intended to be used by ACE as a motor vehicle repair facility.
The parties progressed matters through a term sheet and instructed solicitors. However, the negotiations were expressly conducted on a “subject to lease” basis. Critically, no agreement for lease or lease was ever executed and certain matters remained unresolved, including Motorpark’s position that ACE would be required to enter a deed of renunciation under the Landlord and Tenant (Amendment) Act 1980.
Notwithstanding legal advice warning against taking occupation before the documentation was finalised, ACE went into possession in January 2017. ACE carried out fit‑out works at the premises and took over four employees. ACE later relied on those steps in support of its claims. In 2018, Motorpark sought vacant possession on the basis that ACE was merely a licensee. ACE then commenced proceedings contending that a concluded agreement for lease existed (or that the “subject to lease” condition had been waived) and, alternatively, that Motorpark’s conduct gave rise to proprietary estoppel.
Procedural History
At first instance, the High Court rejected ACE’s contention that the parties had entered into a concluded agreement for lease and held that the requirements for proprietary estoppel were not met. The Court did, however, conclude that ACE occupied the premises as a yearly tenant. On appeal, the Court of Appeal took a different view, finding that a binding agreement had been reached notwithstanding the “subject to lease” qualification and that Motorpark’s conduct gave rise to proprietary estoppel. ACE also relied on its acts of occupation and expenditure in support of its case, including by reference to part performance. Motorpark appealed those findings to the Supreme Court.
Decision
The Supreme Court allowed Motorpark’s appeal, overturning the decision of the Court of Appeal.
In the majority judgment, Collins J held that no concluded agreement for lease had been formed. The correspondence and dealings were expressly “subject to lease” and that qualification was not waived. It therefore operated as a decisive indication that the parties did not intend to be legally bound unless and until a written lease or agreement for lease was executed, and there was no clear waiver of that stipulation.
Collins J also addressed part performance, stating that, because no concluded agreement for lease existed, part performance did not arise as a route to enforceability; the same acts were considered instead within the proprietary estoppel analysis.
The Court rejected the proprietary estoppel claim, holding that, notwithstanding ACE’s detriment, ACE failed to establish an equity the Court should protect in the context of a legally advised commercial negotiation. In a commercial setting, where parties are negotiating at arm’s length and are legally advised, the threshold for establishing an estoppel is not met merely because one party proceeds in anticipation of an agreement and the other does not intervene. The Court considered it significant that ACE went into occupation and incurred expenditure despite legal advice warning against doing so before the lease was finalised.
In a partly dissenting judgment, Woulfe J differed as to the application of the principles of estoppel to the facts. In particular, he considered that the Court of Appeal was entitled to treat aspects of the evidence as amounting to a sufficiently clear assurance for estoppel purposes, noting that certain testimony relied on by ACE was not challenged in cross‑examination. Woulfe J would have found proprietary estoppel established on the unchallenged assurances but would confine relief to a monetary award reflecting expenditure, not specific performance of a lease. Woulfe J did not disagree with the majority’s approach to contract formation: the “subject to lease” qualification remained the appropriate starting point in assessing whether the parties intended to be legally bound.
Key Takeaways
The decision highlights the importance of contractual discipline in commercial lease negotiations. Where negotiations are expressly conducted on a “subject to lease” basis, the courts will generally treat that qualification as ordinarily decisive, absent a clear waiver or subsequently executed contract. Parties who proceed on the assumption that agreement is inevitable, without securing contractual certainty, do so at significant risk.
It also serves as a caution against over‑reliance on part performance. Even substantial acts such as taking possession, fitting out premises, or transferring staff will not make an agreement for lease enforceable unless there is first a concluded bargain with the essential terms agreed.
For further information, please contact Eimear Collins, Gerald Byrne or your usual Dispute Resolution and Litigation contact.
