Range from the cheapest Boiler service £22 (Xpress Gas Services based in WV3) to the dearest Boiler service £180 (JG Builders based in WV10).
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 TF3