It depends on the context, but broadly speaking that is a very large double bedroom. To give a random example off the top of my head, if you were looking for a middle of the range 4 bedroom detached house you wouldn't necessarily expect any of the bedrooms to be that big. Some will have bedrooms that big of course, because houses can differ wildly in their dimensions, but it's not something you would expect. In your average four bedroom detached house it would be a good sized master bedroom. I just went on Rightmove and searched four bedroom detached houses around £500,000 in Manchester, and of the first three I clicked on one had a master bedroom slightly bigger than that and three bedrooms smaller, and with the other two even the master was slightly smaller.