If the tenant stays even one day longer than the last day of a fixed-term rental, a legally guaranteed periodically guaranteed vacancy rental relationship occurs, which the tenant can terminate by sending a valid notice of termination. As for resident owners, this will usually be the case if someone rents some kind of grandmother`s extension of the “garden apartment”. It does not apply to situations where the owner owns two or more properties in a purpose-built apartment building and rents one and lives in another – here, the rented properties will be ASTs. When the landlord rents a room to a tenant, it`s usually not a rental at all (see more on my Lodger Landlord website). .