Range from the cheapest Wallpapering £275 (London Interior and Exterior based in E8) to the dearest Wallpapering £450 (Shakina Glory Removals based in N7).
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 EC1.