Range from the cheapest fitting of a smoke alarm £64 (Lee Electrical based in N2) to the dearest fitting of a smoke alarm £164 (B.S.D Design & Build LTD based in NW4).
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 N3 by posting a job with HaMuch and we will send it to electricians in N3.