Range from the cheapest Wallpapering £345 (Goodvinil.pt based in SW1A) to the dearest Wallpapering £450 (Prime Palette based in NW8).
Comparing painter & decorators estimates for Wallpapering gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for wallpapering your rooms by posting your job to painter & decorators in W1H.