Range from the cheapest fitting of a smoke alarm £44 (E7 Electrical Ltd based in E6) to the dearest fitting of a smoke alarm £184 (Mr Kilowatt based in SE28).
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 SE18 by posting a job with HaMuch and we will send it to electricians in SE18.