Range from the cheapest Boiler service £50 (Pinnacle Gas & Heating services based in E11) to the dearest Boiler service £150 (Heat Tec based in E17).
Comparing heating engineers estimates for a Boiler service 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 a boiler service by posting your job to heating engineers in E18