Class Q legislation has been updated from 21.05.2024   Currently, only the Amendment has been published:   https://www.legislation.gov.uk/uksi/2024/579/made   So needs to be read in the context of the previous Order with its updates   https://www.legislation.gov.uk/uksi/2015/596/schedule/2/part/3/crossheading/class-q-agricultural-buildings-to-dwellinghouses   The main changes I see are that converted dwellinghouses are now limited to 150m² floor