Range from the cheapest installation of an outside power socket £60 (T K Electrics based in EN1) to the dearest installation of a garden power socket £120 (Moffat Electrical based in EN3).
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 EN3 by posting a job with HaMuch and we will send it to electricians in EN3.