Range from the cheapest fixing an electrical fault £42 (CM ELECTRICAL based in W11) to the dearest fixing of an electrical fault £180 (The Kensington Plumbing and Heating Specialist based in SW7).
Comparing electricians estimates for troubleshooting and diagnosing an electric fault 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 fix an electrical fault in SW7 by posting a job with HaMuch and we will send it to electricians in SW7.

"Troubleshoot & diagnose an electrical fault. Replace a burnt socket and replace main fuse"
SW3
"Troubleshoot & diagnose electrical fault. Washing machine and dishwasher power doesn't come on. (Dishwasher brand new)"
W14