It was a lot. We were surprised we didn't have a charger that could connect to the domestic supply and we would have to buy one. But they missold us the car because they said it had electric memory seats like the one we sold them. It meant whenever I opened the car the seats and mirrors etc moved to my position and DH didn't have to get in a cramped driver's seat. It didn't have memory seats. So they gave us a domestic supply cable for free.
To be honest I didn't think it would be difficult to get a dedicated charging post and I was more deterred by the cost. With a £1,000 installation it would probably bring the total cost of charging to a similar cost to fuel a petrol car over three years.
When I then looked into cheaper electricity tariffs, we could get a cheaper deal if we had an installation via the energy provider. That's when I looked into the actual cost and realised the difficulty and expense in installing a separate radial spur. Also we have three adults working from home, so the reduction in power use if we went to a night time tariff was minimal. But then our daytime use would have cost 17p a kWh more.
I didn't really trust my calculations so I fed it all into ChatGPT and received a response that "daisy-chaining" the car charger meant we lost power at each point. It is plugged into an extension cable that goes to the back of the garage which is plugged into a four way that holds the router (yes we have WiFi in the garage) and the freezer, and then plugged into the socket. It suggested we get a separate socket for the car to reduce inefficiency and for safety reasons.
We need a new fuse control box and a separate socket. Along with replacing a toggle switch for our landing light that was incorrectly wired when the house was built, it will be around £320.
It was a much more complicated decision than I realised. Had I done the research before we bought the car, I suspect we wouldn't have bought an electric vehicle at all. But it has probably worked out for the best.