Range from the cheapest installation of an outside power socket £45 (Richard P Electrical Contractor based in BR2) to the dearest installation of a garden power socket £170 (Bromley handyman based in BR2).
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 BR4 by posting a job with HaMuch and we will send it to electricians in BR4.