Range from the cheapest Fit a new plug socket £90 (LS Electrical based in N17) to the dearest Fit a new plug socket £230 (SM Electrical based in N9).
Comparing electricians estimates for a Fit a new plug socket 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 by posting your job to fit a plug socket to electricians in N9.