Range from the cheapest installation of a burglar alarm £150 (Kam's Electrical Ltd based in UB6) to the dearest installation of a burglar alarm £500 (BGE Developments Ltd based in W3).
Comparing electricians estimates for fitting a burglar alarm 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 install a downstairs toilet in W13 by posting a job with HaMuch and we will send it to electricians in W13.