Range from the cheapest installation of an outside power socket £60 (Sam electrical based in Nw1) to the dearest installation of a garden power socket £180 (Novalux Electrical Services Ltd based in SW1Y).
Comparing electricians estimates for installing an outside RCD 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 to install an outside power socket in St James's by posting a job with HaMuch and we will send it to electricians in St James's.