Range from the cheapest installation of a burglar alarm £150 (Plumbing & Heating based in SW11) to the dearest installation of a burglar alarm £450 (W.A.N Engineering Ltd based in sw16).
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 SW12 by posting a job with HaMuch and we will send it to electricians in SW12.