Range from the cheapest fitting of a smoke alarm £40 (AP Electrical based in TF10) to the dearest fitting of a smoke alarm £84 (Smart Switch Electric based in TF2).
Comparing electricians estimates for fitting smoke detectors 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 to fit a fire alarm in ST20 by posting a job with HaMuch and we will send it to electricians in ST20.