Range from the cheapest fitting of a smoke alarm £44 (Husselbee Electrics based in B74) to the dearest fitting of a smoke alarm £84 (Electroplumb Ltd based in WS2).
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 WS1 by posting a job with HaMuch and we will send it to electricians in WS1.