In brief, Class R ( Schedule 2, Part 3) of the General Permitted Development Order 2015 (as amended) allows for the change of use from an agricultural building (and land within its curtilage) in England to a commercial use i.e., uses involving storage or distribution, hotels, shops, financial and professional services, restaurants and cafes, and assembly and leisure.
So, if you are thinking about converting a farm building to storage, a hotel, an office, gym, or café Class R might be an ideal permitted development option for you.
However, you also need to be aware that when going do