Legal Case Summary
Thorner v Major [2009] UKHL 18
LAND LAW – PROPRIETARY ESTOPPEL – REQUIREMENTS
Facts
The claimant had worked on the defendant estate’s farm for over a decade without pay, believing that he would inherit the land when the defendant died. While the defendant once gave the claimant a bonus stating that it was for his ‘death duties’, he never explicitly told the claimant he would inherit. Under the original will, the property would have passed to the claimant, but the defendant retracted this will and died intestate. The claimant argued he should inherit the property due to proprietary estoppel.
Issues
A person will have an inchoate ‘equity’ in land if they can establish proprietary estoppel: that the land-owner made an unequivocal representation that the individual had an interest in the property, which that individual relied on to their detriment, such that it would be unconscionable for the land-owner to renege on his assurance.
The issue in this case was whether proprietary estoppel can arise in the absence of an explicit representation of proprietary interest.
Decision / Outcome
The House of Lords held that the claimant had established proprietary estoppel.
The House of Lords held that it is possible for a representation to be made by conduct alone, so long as that conduct conveys the message to a reasonable person sufficiently clearly that the claimant was to have a proprietary interest in the land. This was to be determined by all relevant circumstances, including the context of any representations or conduct, the relationship between the parties and their understanding of the context. In most cases where the message behind the conduct is somewhat ambiguous, the House of Lords thought this would not normally act to defeat proprietary estoppel.
On these facts, the conduct gave a sufficiently clear representation of proprietary interest to give rise to estoppel.
Updated 21 March 2026
This case summary accurately describes the decision in Thorner v Major [2009] UKHL 18. The legal principles set out remain good law. Proprietary estoppel continues to require an assurance, reliance, and detriment, and the House of Lords’ clarification that an assurance need not be explicit but may arise from conduct — assessed in context — remains the leading authority on this point.
Subsequent cases have applied and developed the principles from Thorner v Major, including in the Supreme Court in Guest v Guest [2022] UKSC 27, which confirmed the continued validity of the proprietary estoppel framework and addressed the question of remedy — specifically, whether the court should aim to fulfil the claimant’s expectation or merely reverse their detriment. The majority in Guest v Guest held that, in most cases, satisfying the expectation will be the appropriate starting point for relief, though the court retains discretion. Students reading this summary should be aware of Guest v Guest as an important development on the remedial aspect of proprietary estoppel, which is not addressed in this summary but is now an essential part of any full treatment of the topic.
