Use classes (categories) have been introduced which relates to dwelling houses, second homes and holiday lets, as follows:

Use class definitions and what they mean
Use ClassExplanation
Class C3.Dwelling House; Main HomesUse of a dwelling house as a sole residence or main residence, which is occupied for more than 183 days in a calendar year by –(a) a single person or by people who are considered to form one household;(b) no more than six residents who live together as one household, where care is provided for the residents; or(c) no more than six residents who live together as one household, where care is not provided for the residents (except for use which is in class C4).
Interpreting Class C3:
Class C5.Dwelling House; Secondary homesUse as a dwelling house, other than as a sole or main residence, occupied for 183 days or less by –(a) one person or by people who are considered to form one household;(b) no more than six residents who live together as one household, where care is provided for the residents; or(c) no more than six residents who live together as one household, where care is not provided for the residents (except for use within class C4).Interpreting Class C5:
Class C6.Short term let accommodationUse of a dwelling house as commercial short-term letting accommodation for a period not exceeding 31 days (for each occupation period).