The appraiser report can be revised as long as the appraiser is willing to revise it :) In most cases if an error has been made, they don't mind. The next part is if the appraisal has already been sent to underwriting. Like said before, the underwriters need a pretty good excuse for changes on the appraisal. Can you describe the inaccurate info? If you need an increase in price...your Mortgage Broker may need to send to a different lender. If it is with repairs, then the repairs need to be completed before you buy the house or refinance. Good Luck!