Range from the cheapest fitting of a smoke alarm £40 (Jay Tec Industries Ltd based in WN8) to the dearest fitting of a smoke alarm £124 (Bright Sparks based in L32).
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 L39 by posting a job with HaMuch and we will send it to electricians in L39.