There are simply things that can't be measured quantitatively, and shouldn't be measured that way. The art of qualitative analysis seems to be lost on many in our profession. A few years back I read an appraisal of a commercial property where the CG appraiser had no numerical adjustments for a commercial property. All of his was by ranking which is an acceptable appraisal practice. Superior, inferior, similar. This is pure qualitative.
I know of a CG who uses percentages for adjustments. No hard numbers. It is a mix of both approaches.
Back to the granite counters and the adjustment. How does one adjust for this type of item numerically when there are so many unknowns? I have a total of about 75 linear feet of total counters in my home including bathrooms and kitchen island or say about 200 SF of counters (we have a lot of counter space). The neighbor across the street has a similar home to mine but I would estimate she has about 40 LF of counters or ~100 SF (no island and much smaller master bathroom).
If we agree that one can install nice granite for say, $50/SF then the COST of my counters would be ~$10,000 while my neighbor has a COST of ~$5,000.
If we agree that laminate counters can be installed for $10/LF my kitchen would be ~$2,000 and my neighbor would be ~$400. Remember our homes would be considered comparable.
The problem comes with confirming the amount of counter space (couldn't that also be some numerical adjustment) in the comparable properties and actually measuring the subject counter top area. What a can of worms that is.
How many want to measure counter space? How many want to estimate comps counter space? How many want to hang their hat on ANY adjustments with so many unknowns?
Let us say that some appraiser thinks that a good adjustment for granite is $5,000 and uses it in his lending work. No one questions it. Fine, you get away with it.
Now we have a divorce assignment and we throw in that same adjustment. Well, it is high profile, the husband and wife hate each other and there are now two appraisals (yes JGrant I am bringing up litigation again).
If I am the other appraiser and asked to review the other appraisal my review is going to ask where that adjustment comes from. My advice to the attorney is going to be to ask the other appraiser where the adjustment comes from. Then ask how many linear feet (or square feet) of counters does the subject have and how much counter space does each of the comparables have. I am also going to advise the lawyer to ask the appraiser what type of counters the properties have. Are they laminate, molded with sinks, stainless, corian, cement, plywood

, etc.
After the lawyer is done beating the appraiser up over the counters we will go after the stupid fireplace adjustment that no one can prove. My neighbor only has one, while I have two.
The next question is why are we not adjusting for high end flooring? An exact floor plan house to mine sold in the spring of this year. 18 year-old home; 2,750 SF. Our houses are IDENTICAL in floor plan. The home has linoleum floors in the kitchen and bathrooms; I have wood throughout. The wood is $10/SF while laminate can be installed for $2/SF. We are talking about 800 SF or a COST of $8,000 vs. $1,600.
Finally, another neighbor just put in a new driveway and a new beautiful stamped patio. The patio has dye in it and is great. He spend $13,000 on the patio and driveway. He already has a patio and driveway. His patio is only about 200 SF. My 18-year old deck is ~600 SF and I have a driveway. Do we make an adjustment there?
I would suggest that appraisers consider overall quality and overall updates and address this in the reconciliation of value with a few paragraphs of narrative.
When I started in this business I was taught that every report had to be defensible in a court of law or before the state board.
If I am working for an attorney and there are random adjustments that have absolutely no support I am going to advise (and I have done so) the lawyer to go after the appraiser on the above issues and questions.
I can tell you it is not a pretty situation.