detrimental reliance

Detrimental reliance occurs when someone takes action based on a promise or assurance made by another person, and as a result, faces negative consequences when that promise is not fulfilled. For example, if a landlord tells a tenant they can stay in a property for a year, and the tenant moves out of their old home and incurs moving costs, the tenant may suffer harm if the landlord later changes their mind. In legal terms, it can support claims for damages if one party relied on the other's promise to their detriment.