Range from the cheapest fitting of a smoke alarm £44 (The Cardiff Plumbers based in CF3) to the dearest fitting of a smoke alarm £124 (Power Full Electrical based in CF23).
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 NP10 by posting a job with HaMuch and we will send it to electricians in NP10.