Range from the cheapest installation of a burglar alarm £180 (S Quarrie based in IG8) to the dearest installation of a burglar alarm £500 (SM Electrical based in N9).
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 E4 by posting a job with HaMuch and we will send it to electricians in E4.