No, he would have needed Full Planning Permission for them. He may have got Class Q initially for each one but then reapplied for full Planning Permission using the Class Q as a fallback position. Then once they are built the Class Q was not enacted so there are still 0 Class Q conversions on the holding so he then reapplied for the next buildings and then repeat the process.would he be able to get them on permitted development?
Actually building out a Class Q conversion is a PITA so most developers will get the Class Q and then use that as a fallback position when reapplying for full Planning Permission which then gives them more flexibility.