You are going to sit there with a straight face and say that appraisers don't make unsupported guesses about an adjustment or in the cost approach (half the appraisers don't even own a cost book) they might put down $10,000 or $15,000 or whatever as the "site improvements" "as is." They cannot even tell you what the site improvements are. Utilities? driveway. Sidewalk. Fencing. septic and well if in the country. Review a few reports. They guess at a lot of things. They might be in the ballpark and maybe not. On unique items - pools and outbuildings - the typical report I see, particularly from a residential appraiser, is a pure unadulterated guess...maybe an educated guess but still a guess. They cannot show you extractions of comparable outbuildings or pools. They cannot begin to even explain how they arrived at half their adjustments. I saw one back a while that made 14 adjustments on the 3 comps. There was vague references to 'held in file' or 'paired sales' without a single exhibit of how they got there from here. And if you read the sanctions from boards that is a huge issue. Appraisers making blind stabs at an adjustment without any support whatsoever. And some end before the board and many escape scrutiny for decades.
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I guarantee that this last one 12, was pulled out their arse. They had zero support for the contributory value of the shop.