There is no 'set' way to determine value of a car with a rebuilt title, obviously it should be less than a car with a good title, but how much less depends on the market for that car. Once an insurance company decides a car is damaged beyond a certain percentage of the value they total it. It doesn't mean it can't be repaired, it just means that the insurance company isn't willing to do it. If repaired properly, it can be a nice car, if done poorly, well, I think that goes without saying.. Check it out real good, hopefully they have some pictures of it when it was wrecked so you can see how extensive it was. Are they the original owner? Did they own it when it was crashed? Or are they trying to make money by putting it back together and selling it? I would probably stear clear of the latter unless I knew their history, people care more about the way things are fixed when it's theirs

No matter what, use it to negotiate if you want the car, that goes without saying.