Promises About Property: Understanding Proprietary Estoppel

Introduction

Sometimes a person is promised that they will one day own a piece of property - often a farm, a family home, or a business - and, trusting that promise, they shape their life around it. They work the land for years, pour money into improvements, or give up other opportunities, all on the understanding that the property will eventually be theirs.

‍What is proprietary estoppel?

But what happens when the promise is broken? When the owner changes their mind, leaves the property to someone else in their will, or simply never transfers it?

This is where proprietary estoppel comes in. It is a legal principle that can prevent a property owner from going back on a promise where it would be unconscionable (that is, unfair to the point of being against good conscience) for them to do so — even if that promise was never put into a formal, signed contract.

A real-world example: Kramer v Stone [2024] HCA 48

The principles are well illustrated by a recent decision of the High Court of Australia, Kramer v Stone.

The facts

• David Stone spent around four decades living and working on a rural property. He had built his life there in reliance on assurances from the owners - Mr and Mrs Kramer - that the property would one day be his.
• He worked the land under an informal (oral) share-farming arrangement, earning only an irregular and meagre income, and made significant contributions to the property without being properly compensated.
• The promises were made over time. Mr Kramer told Mr Stone the property would become his. The plan was that it would pass to Mrs Kramer on Mr Kramer's death, and then to Mr Stone on Mrs Kramer's death.  After Mr Kramer died, Mrs Kramer confirmed that promise to Mr Stone.
• Trusting these promises, Mr Stone kept farming the land. He did not buy his own home, build up superannuation, or pursue other career opportunities. He even lived in poor conditions - a run-down shack on the farm that the owners never repaired - while continuing to work.
• When Mrs Kramer died, the property was not left to Mr Stone. Her daughter, Ms Kramer, did not want it transferred to him. It later emerged that Mrs Kramer had quietly removed Mr Stone from her will without telling him, while continuing to let him work the land.

The outcome

The court found in Mr Stone's favour. Because he had relied on the promise to his serious detriment, and because it would be unconscionable to let the promise be broken, the property was held on a constructive trust for him - in effect, the law required the promise to be honoured.

The owner's side had argued that Mr Stone had received benefits along the way, that a person has the freedom to change their will, and that the family had its own entitlement. Those arguments did not overcome the strength of Mr Stone's reliance and the detriment he had suffered. The consistency and credibility of his account - his conduct throughout was that of someone who genuinely believed the property would be his - was important to the result.

The building blocks of a claim

While every case turns on its own facts, a proprietary estoppel claim generally involves the following ingredients:

• A promise or assurance — the owner leads the other person to expect that they have, or will receive, an interest in property.  The promise must be clear and unequivocal.
• An expectation of reliance — a reasonable person in the owner's position would have expected the other person to rely on that promise by doing (or not doing) something in particular.
• Reliance — the person actually relies on the promise, organising their affairs around it. It is ordinarily necessary to show that the person would not have acted or omitted to act in the absence of the promise (so the promise motivated the action or non-action). In Kramer v Stone, Mr Stone kept farming the land precisely because of the promise.
• Detriment — the person suffers a real disadvantage as a result. This can be financial (such as years of meagre income, or money spent on the property) but also non-financial — for example, not buying a home, not building superannuation, and not pursuing other work or a different life.  Need to demonstrate that the person would be left in a worse position as a consequence of reliance on the promise, than if the promise had not been made at all.

Where does "unconscionability" fit in?

A common misunderstanding is that "unconscionability" is a separate box that must be ticked. The High Court confirmed that it is not a standalone element. Rather, it runs through the analysis - in particular, it is bound up with the question of detriment. The key question is whether the owner's conscience is "coloured" by the detriment the other person has suffered. If allowing the owner to break the promise would cause real, unredressed harm, that is what makes their conduct unconscionable.

What did the High Court clarify?

Kramer v Stone settled some important points:

• Long-standing principles still apply. The established framework for these claims remains good law.
• Actual knowledge is required. For this kind of claim, it is not enough that the owner should have known the other person was relying on the promise. The court rejected the idea that mere "constructive" knowledge would do — there must be actual knowledge of the reliance.
• A separate idea - "estoppel by encouragement." This is a related but distinct concept, which typically requires that a person was mistaken about their legal rights, spent money on the faith of that mistaken belief, and was encouraged to do so by the owner.

What can a court order?

Where a proprietary estoppel claim succeeds, the usual starting point for the remedy is that the promise should be fulfilled - the person receives what they were promised - unless doing so would itself be unconscionable. In some cases the court will instead fashion a more limited remedy: the minimum needed to do justice between the parties.

Key takeaways

• Promises about property can be enforceable even without a formal written contract.
• A claim generally needs a promise, reliance on it, and detriment suffered as a result.
• Unconscionability is not a separate hurdle - it is woven into the question of detriment.
• The owner must have actual knowledge of the reliance, not merely constructive knowledge.
• If a claim succeeds, the court will usually try to make good the promise, or otherwise do the minimum required to achieve fairness.
• These cases are fact-sensitive and evidence-heavy - a consistent, credible account matters.

How Sharrock Pitman Legal can help?

There’s no such thing as an idle promise when it comes to real estate. So, it pays to be careful what you say and what you do, especially when it comes to how and when future ownership will come about. 

If you believe aspects of this case are relevant to your situation or likely to be so, seek legal advice at the earliest opportunity.

Our Accredited Specialist Litigation team can advise you on the best course of action to protect your interests. Please do not hesitate to contact us on 1300 202 506 or email sp@sharrockpitman.com.au.

Disclaimer

This article is current as at the date of publication and provides general information about proprietary estoppel. It is not legal advice and should not be relied on as such. If someone has made you a promise about property that you have relied on — or if such a claim has been made against you — you should obtain tailored legal advice.

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