My wife's sister is just now finishing up the renovation on another of my wife's houses. She is very frugal. In fact she always has shown the ability to manage money with the best of them. She is boots on the ground for my wife and pays for the material and labor as they are needed.
So far and the project is nearing it's end, my wife has zero complaints. This situation is very likely to be somewhat uncommon but definitely not out of the question. Just be aware that problems are more likely to happen than not.