Range from the cheapest installation of an outside power socket £30 (Greenspark Electrical based in EN11) to the dearest installation of a garden power socket £110 (TwoNineOne Electrical Contractors based in CM20).
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 CM19 by posting a job with HaMuch and we will send it to electricians in CM19.