Proprietary Estoppel

The explanatory notes to the Land Registration Act 2002 set out the classic proprietary estoppel scenario: a landowner, A, 'leads or allows the claimant, B, to believe that he or she has, or can expect, some kind of right or interest over A's land.' Crucially, the detriment must occur with the landowner's knowledge — 'To A's knowledge, B acts to his or her detriment in reliance on that belief' — before 'A then refuses B the anticipated right or interest in circumstances that make that refusal unconscionable,' at which point the claimant gains a right to relief: 'This gives B the right to go to court and seek relief.'

The remedy is not fixed to the assurance as promised. The notes explain that the court has 'a very wide discretion as to how it will give effect to this equity,' guided by the principle that it will 'analyse the minimum equity to do justice' to the claimant. Remedies observed by the courts vary widely, from one extreme to the other: courts have 'ordered A to convey the freehold of the land in issue to B. At the other, they have ordered A to make a monetary payment to B.' Section 116 of the same Act also 'confirms the proprietary status of an equity arising by estoppel in relation to registered land,' meaning it 'can be protected by entry of notice in the register, or, where the claimant is in actual occupation of the affected land, as an interest whose priority is automatically protected without the need for registration.'