re: What is standard operating practice for additional costs incurred in home repair

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extra cost is never discussed.

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You shouldn't just assume somebody is doing something extra for free. But the contractor should have let you know. There has to be transparency for anything over an agreed upon cost. Small things can be verbally agreed upon but major changes needs to be signed off.

I'd ask for line item cost for each additional task performed and review with that person and have them explain what exactly it is that they did. Then point out where you are displeased about damage and give them a chance to remedy.

Do not pay anything else until both parties are content. I can't imagine someone just sticking an extra 25% on any fee without providing a list of services with costs. remember, it serves you just as well to be fair with the contractor but you also need to expect a job done to at least your satisfaction.