There are many variables that will determine the cost of installing the new circuit. Where is the service panel located in relation to where you want to install the charging equipment? Most of the cost of installing an electrical circuit is in the labor so it makes sense to plan for your current and future needs.I'm using the standard wall charger but I can only charge at 8A. When I plug it in, it automatically drops it to that level probably because I also have a freezer in my garage. The freezer is plugged into another outlet, but they are all on the "garage" circuit on my breaker.
So far, the 8A has met my needs, but I wish it was a little faster. (I'm currently only getting 2-3 mph).
How easy/costly would it be to get the outlet I'm currently using for the charger on its own 15A breaker so that I could draw 12A? I'm guessing the electrician would just need to install another switch on the panel and just move the wires to that outlet to the new switch?
To start, determine your needs. How many miles, per day, do you typically drive? (If the current 120V/8A charging is adequate then upgrading to 240V at any of the common 240 circuit ratings (20A, 30A, 40A, 50A, 60A) will be more than adequate.) A reason to install one of the lower amperage circuits is that your home's service is already nearly fully loaded. A reason to install one of the higher amperage circuits is you want to charge faster. If you have at least 6 hours, overnight, to charge the Tesla vehicle at home any of the 240V circuits will be able to meet your home charging needs.
Contact several electricians and request they review your home's electrical service and provide you with a price quotation.