An (Oregon) contractor did work on our house 5 or 6 years ago. As far as we know, we've paid everything he's billed us for. When he was doing the work, he presented us with an invoice monthly, and we paid him on the spot. I think all in all we ended up paying him about $70k. There may have been a few times that he came back to finish up a small detail or revise something we weren't happy with. Small things. We never received an invoice for these things. Shortly after that, we had a few small items we asked him to take care of for us. We asked over and over for him to give us an invoice. It seemed like he had problems hanging on to a bookkeeper so he would just say "I will", but never did. Since then everytime he's come to do any work for him, we paid him cash before he left. We didn't want his fees to pile up. We asked him to send us an invoice for the work and the payment everytime, but he never did. My sister had him hang some doors 2 years ago. She paid him. However, that got me to wondering what we would do if he presented us with a bill? How many years are we on the hook to him if he comes knocking with an invoice for work he did so long ago? Thank you!