If you know which wallpoint they had previously, it can be a straightforward install provided the same model is available and it has same wiring needs. I think all of these wallpoints need CT clamping which are connected to main electricity connection via a seperate data cable or these days data cable is built into the main wire itself so its worth checking. And some devices need seperate earthing and some don't for PEN fault detection. Its worth understanding these first and go from there. And if you are thinking about solar, worth going for a wallpoint that can integrate better with other devices and get everything done in one go.I have moved to a property where the previous owner left with his chargepoint (!), but left everything in the Consumer Unit, as there is a 40A RCCB + breaker labeled 'Car' inside.
I am right in thinking as, most of the install is already preexisting, there is now just a matter of suppling and rewiring a wall charger and therefore, I should get a lighter quote from an EVHS installer for a 7kW? What can I expect in terms of £? Sub-500 including the wallpoint?