As far as appraising the same property more than once, it can done per USPAP as long as you disclose that you appraised the property to the new client and the confidentiality agreement did not specifically state the appraiser could not accept another assignment for the property from the original client. Everything that was confidential regarding the physical characteristics will be evident upon the new inspection. I have done more than one appraisal for the same property many times in less than three years. Typically, it is the same lender ordering a new appraisal, but sometimes it is a new lender. I have done listing appraisals in small towns and had to do the loan appraisal for the lender when sold. As long as you disclose and do your job correctly, there is no harm or foul. I have also had to do a new appraisal on a property because the physical characteristics were changed (lot size, additions, etc).