Do a search - loads of people have asked before - and it varies massively even within a college. Some colleges will have price bands - @ Jesus I'm fairly sure we all pay the same - mine is probably something like 4.5 x 5 and i share a bathroom with 5 other girls. On the other hand my tute partner has a tiny bedroom but shares a sittingroom (at least 4 times the size of my bedroom) with her room mate and they share a bathroom.