do you know what a proper setup includes or are you just going for screen and projector?
people usually have to customise the full room to accomodate a projector. controlled lighting. blackout curtains/blinds. change the colour of walls even the ceiling.
or others simply just buy a projector and a screen don't care about PQ at all.
The property we're currently looking at has two reception rooms - one of which would be perfect for a projector/movie/gaming room, the other can be a tidy wood floored living room with nice furniture.
I've always wanted a home cinema set up, and as long as I get the final nod, I'll probably go for the best effort I can, including the above