The real issue only occurs if you misrepresent how much money you need from the beginning of the claim process. At that point, you’re committing fraud. However, if the plumber initially estimated more but the repair ended up costing less, there shouldn’t be an issue.
That said, any gain from insurance claims are considered capital gains, meaning they can be taxed. While normal insurance payouts aren’t taxed, overpayment means you’re gaining income. If this occurs, you may need to report the gain to the IRS on your taxes. A tax professional can help you figure out how to proceed during tax season.