Range from the cheapest Wallpapering £160 (Ghani Constructions based in IG1) to the dearest Wallpapering £550 (A Plumbing and Heating based in E11).
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 E7.