Estoppel is a legal principle that prevents a person or entity from asserting a legal right or taking a legal position that contradicts or is inconsistent with its earlier position, behavior, or agreement. The person or entity is said to be “estopped” from changing its position, behavior, or agreement because another person or entity has relied on its earlier position, behavior, or agreement (detrimental reliance).
In Pennsylvania, estoppel is a legal doctrine that can prevent an individual or entity from asserting a claim or a defense that contradicts what they have previously done or agreed to, especially when another party has relied on that earlier conduct to their detriment. This principle is applied to ensure fairness and prevent injustice due to inconsistent behavior. Estoppel can arise in various contexts, including but not limited to, real estate transactions, contract disputes, and employment relations. The specific application of estoppel can depend on the circumstances of each case, and Pennsylvania courts will consider factors such as the representations made by the party being estopped, the reliance by the other party, and whether that reliance was reasonable and led to a detriment. Estoppel can take several forms, such as promissory estoppel, equitable estoppel, and estoppel by deed, each with its own nuances and requirements under Pennsylvania law.