Hiya - MIL has asked if we want to live with her (she has much biger house, garden etc.) and we though we could rent out our house for 6 months or a year while we lived at MILs. We rung our mortgage company who said we needed a buy-to-let mortgage, and we would need to pay a penalty of £6,000 to get it changed. Is it illegal to rent out the property under a normal mortgage? Its relativly short term...