STARTING A RESTORATION BUSINESS

What you're doing is pretty dangerous. No business license....I'm "guessing" no insurance.

I have a friend who is......meh, I guess about 10 years older than I so that puts him bout 65-67 and he's been doing work in this county like you for well......purt near all his life. Everybody knows him. He does really decent work. Builds hot rod street motors....does paint and body work....does entire restorations from time to time. Of course he's slowing down a little.

Back in 2019 his shop caught fire and burned TO THE GROUND, with several high end cars and engine builds and his own personal car. A really NICE Chevelle. Lost everything. No insurance, no business license. It was sad, really. Then his daughter gets on Facebook cryin about how he lost everything and askin everybody to donate to a gofundme. Now, I like the guy. He's a decent sort. BUt he's one of these that's never filed taxes, thinks the gubmint is the enemy......I can't disagree there.......but does everything he can to not contribute to the local or federal gubmint....INCLUDING pulling a trailer behind his everyday ride so the cops can't see his expired tag.

I kinda got of on a tangent there. Not sayin any of that is true about you, but you REALLY need to be very careful running an illegitimate business. Anything can happen.

I take in maybe three projects in maybe five years, but I don't do paint and bodywork or whole car jobs and I don't pull or install engines. In fact, I'm down to my last job I'm ever going to do here now. The risk is just too great with someone else's property.
Lots of good points here.
Insurance is a must and a LLC is probably a really good idea.
With that being said, You call it a paint and body shop, you are opening up a really big can of worms. You will have to really up your production to cover the cost and will have to hire help to cover your production.
Take a hard look at it.
I was in a supervisor roll for many years and would rather just work by myself these days as my worst problems were always employee related.