A Regulated BTL stands for “Regulated Buy-to-Let,” which refers to a type of property investment in the UK that is subject to stricter regulations than non-regulated BTL properties. Regulated BTL properties are typically rented out to family members or other individuals who plan to live in the property, as opposed to non-regulated BTL properties which are usually rented out to tenants for investment purposes. The regulation is intended to provide greater protection to tenants, including longer notice periods for eviction and more stringent safety requirements.