Most schools don’t have a designated drama studio but some have recently begun to convert old classrooms, or mobile classrooms, into drama spaces. These are my top tips for creating a drama studio:
The whole room should be painted black. Including the ceiling! This is so that (a) any lighting can be used effectively; (b) there are no distractions; (c) it's practical and (d) it provides a blank canvas as a backdrop for any work.
Install blackout curtains or blinds. This is to ensure that no one is distracted by pupils seeing in (or out). It also provides a bit of a sound barrier and, again, allows for a blank backdrop.