I hate to sound like I am defending a bad appraiser but, going into every room of a house and measuring the interior walls, and drawing up an elaborate sketch, is a long way from "personally viewing the interior". Good luck with a law suit if the jerk just so much as looked in one of the windows as they measured from the outside, that would qualify such a loose guideline. Just as personally viewing the exterior of the comps could mean 10 years ago, last week, or on the way to court. Putting a lock box on your home is an implied consent to real estate professionals to gain entry. As was the appraisal assignment. Put the two together and although it is a poor ethical choice to enter in another manner, it is bit hard to prove legally. 88' is a whole different debate as to effecting comp choice. But not a strong one to be made in court. Getting an attorney is just going to be another expense, I would just get another buyer, and take some cold comfort in talking bad about this appraiser to everyone you see in your area. I would turn them into the State board as well. Its easy to do and doesn't cost you anything. I will cause the appraiser some trouble, time, and sleepless nights, maybe. And maybe they will think twice about not going in next time.