No, and no. I know electric wiring standards and methods, and the NEC well, and I help people learn the ropes of having safe infrastructure for their cars, since we're looking at the equivalent of installing gas pumps in homes.
I've seen the (rather unfortunate) results of not getting permits - insurance company denying claims and homeowners losing significant amounts of money because the homeowner didn't comply with the law on permitting. I've seen houses burn due to unsafe electrical installs. I've seen nearly-finished construction projects (closed walls, finish, etc.) torn completely back open because electrical infrastructure wasn't inspected and occupancy permits were refused.
Another item to consider is it can make your home harder to sell. Some insurance companies will not insure a newly-purchased home without a home inspection, and if he sees some new conduit / Romex / etc. without an inspection cleared sticker from the same timeframe, he may call it out and insurance companies may not insure without a more thorough inspection ($$). Some home sale contracts require the affirmation that all improvements were done to code, including permits, which can result in later liability if violations are found or some event happens.
My interest here is in promoting the safety of electrical installs, considering a Model S is likely going to be the heaviest load (in terms of yearly kWh) in your home.
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I did not say that you committed the infraction - many people are, unfortunately, screwed by contractors who don't do the right thing. There is a difference between "YOU DID THIS ILLEGALLY!!!11!!ONE!!ELEVENTYONE!!!OMGWTFBBQ!" and "My guess is that yours wasn't done legally."
It's not personal, it's for my education. Take a chill pill and relax.