[Porsche-O-Phile]

I don't want to lecture you, but you have done something extremely foolish in allowing someone to do work on your property without a written contract and it's going to cost you. Accept it. You are GOING to end up paying this guy for his work (probably an inflated price too) and you are going to end up having to get someone else to complete the work.

At a minimum you should ALWAYS have a written contract for any work done on your property - I don't care if they're replacing a doorknob. It is also an excellent idea to ensure they are properly licensed and bonded and ideally check references including any history of litigation, arbitration or license action.

At the risk of sounding self-serving, hiring a licensed architect or construction manager is always a good idea as well - and not as expensive as you might think. We are trained to deal with these kinds of situations and we know a lot of the games that are often played and how to protect the client's interest. Even standard AIA contracts will protect a LOT of your interests.

Again, I don't want to sound like I'm lecturing but I see this all too often (especially with residential owners). Penny wise, pound foolish.