You don't say where you live, but I'm assuming it's England. I don't believe that under English law your partner would have any rights in the property, in terms of ownership. Oneeyedvic's' reference to a "common law spouse" is certainly wrong, as far as English law is concerned; there is no such thing, even after 22 years living together, let alone 2. However, your partner may well have rights of occupation of your property, and if you tried to evict her against her will she might be able to take the matter to a civil court.