A few years ago one of my neighbours asked for a socket in the underground car park. I assume they paid the full cost themselves, although it probably wasn't t

A few years ago one of my neighbours asked for a socket in the underground car park. I assume they paid the full cost themselves, although it probably wasn't that much -- the electrical supply to the building including the meters for each apartment are just behind his parking space. They installed a normal 16A 400V 3P+E plug (the big red one), which is an easy 11kW. There isn't any sort of 'car charger' on the wall, just this socket.