Range from the cheapest Wallpapering £270 (TTM Improve Homes based in UB5) to the dearest Wallpapering £600 (ThePlumbers.org based in TW7).
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 UB2.