You sure ca't get a clear answer without being redirected to online to suppliers
As a contractor, I'd just like to ad. Free estimates aren't free. We have to make that up somewhere. Which means prices go up on every job, to pay the guys wages that does the estimates. I'm not scolding, or telling you not to. Just please don't get one from every contractor in the book. I'll cease my derailment, and exit the soap box now, thanks.
I appreciate that sentiment .... maybe try to find a way to give those companies some business.
Heck, you never know. You might get a number you like. It's just frustrating when you tell someone you can save them money doing it by the hour, only to have them demand a bid, that you have to pad for unknowns. So even if the unknowns don't cause problems, they're still paying for them. Dang it, I thought I was done derailing.
Unfortunately .... most people aren't going to be that trusting of a contractor unless they know someone personally.
If you are going off grid, it really comes down to your local ordinances (if applicable). Are you in a city or county? That would be where I would start. Call the building department and see if they have any resources.
This. Your local building department should have some info for you
