Comp requests always cause trouble. I can't even get a grasp of value on actual assignments with "average to good" tax data here. Everytime I think I have a "slam dunk" appraisal it bites me in the behind. There is always some angle that can not be expected. The add-on addition, the tax records are 200 SF big (but you said you could get $150,000-I did not say that, you did), garage conversion, the 1,100 sf house is now 2,200 SF, the subject is the only house in the 40 year old neighborhood with all original everything, etc. I will not do comp requests because they want to "nail you to a value" before you go out. Plus, how many times have you gone out on an appraisal assignment thinkng "no way" and left the property thinking "yes way". That reason alone could keep a prospective borrower from getting their home refinanced because a prelimary check does not support their needed value.
I am still expecting some loan officer to call and ask why I exceeded their "needed value" on one property by $20,000 and can't get their "needed value" on another by $5,000 (Its only $5,000, you can get that somewhere). I can here it now, "Can't you reduce the last one by $5,000 and add $5,000 to the this one?" like it is some appraisal well that only has $xxxxxx amount to be shared by all assignments.