OK to average adjusted comps on appraisal?
To Mean, or Not to Mean, That is the Question
By Brent Bowen
Excerpts: There seems to be a consensus among appraisal reviewers that the appraiser should not average the adjusted sales prices of their comparables in order to arrive at an indicated value of the subject from the Sales Comparison Approach. Fannie Mae is referenced as the source of this prohibition, although no such prohibition explicitly exists according to Fannie Mae’s Selling Guide.
There is a prohibition on averaging techniques, but that applies in the Reconciliation section with regards to reconciling the three approaches to value. In other words, Fannie Mae does not want you averaging the indicated values from the Sales Comparison Approach, Cost Approach, and Income Approach in order to arrive at an opinion of value. The discussion of the reconciliation of the indicated value of each comparable sale contains no such prohibition.
The conventional wisdom is that the most similar comparable be given the most weight. But that begs a question… similar how? We can fairly easily observe the comparable which is the most physically similar, but what about the one that is the most transactionally similar? In other words, which comparable deviates the least from the mean?
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My comments: Excellent analysis. One of the best I have read. Basic Appraisal, but not all appraisers know about this, especially if they “appraise to fit the form” aka form fillers. Worth reading, plus the appraiser comments.
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NOTE: Please scroll down to read the other topics in this long blog post on Non-lender appraisals, dealing with lender hassles, real estate market, unusual homes, mortgage origination stats, etc.