Range from the cheapest installation of a burglar alarm £150 (Sam Autos based in N19) to the dearest installation of a burglar alarm £350 (Romex Building Service based in N22).
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 N15 by posting a job with HaMuch and we will send it to electricians in N15.