Before you put a property on the rental market, you should make sure that it meets all the relevant fitness and safety standards. There are additional standards if the property will be a House in Multiple Occupation (HMO). This is usually the case if you are intending to let to groups of students or people who are not all family members. A HMO is classified as a property where more than 2 people from different families live. Buildings which have been converted from single homes into flats are also regarded as HMOs.