Sounds like you are an exceptionally diligent appraiser, and keep on doing you! However, appraisers are not responsible for verifying that permits from the local authority are in place for every modification ever made to a structure. That is an impossible "standard of care" to meet, and I would not be giving my clients the impression that I did any such thing. You have been doing this a long time. Have you always gone down to the building department and used the microfiche machine to examine the permit history of every subject you ever appraised? In every little burg of your service area? How far back do they go? Even in the the most data rich environment I operate in, the permit history stops in the early 80s. Any modification done prior to that, there is no record of. When FHA was training us in the early 90s, that question was asked and answered with "FHA does not require the appraiser to verify permits". They still don't. Nobody believes in getting permits for "any modifications" in most of the markets I appraise in, they concentrate on trying to shortchange the assessor instead. When I run into one of those situations, I place the client on notice whether floor plan modifications are reflected in public records, and if they aren't, whether the modifications are functional & "appear" commensurate in quality with the rest of the dwelling. That is the extent of our responsibility, being "the permit police" is not. I have never (in 30 years) had a client who demanded that I verify that permits were in place after placing them on notice that the subject had modifications which weren't reflected in public records, a scenario which has occurred innumerable times. I do not ensure that the owner obtained a permit for their kitchen or bath remodel, water heater or roof replacement, nor do I place the lender on notice regarding such issues. Neither does any other appraiser operating in my market. Speaking collectively for all my peers, however, I can safely say that we would love to operate in a market where "permits" are internet searchable, they would greatly assist documenting exactly "why" we the make the condition/quality adjustments to the comparables which we do.