Doesn't matter. Look at my models on
https://www.pacificvista.net/price-models-san-mateo-county. I left out a missing piece - the ranking of the comparables needed to score the subject property. I wanted to keep my distance from providing anything that could be regarded as an appraisal - and created the models as a broker analyst.
But I could have easily made this a semi-AVM, only needing an inspection of the subject property and ranking against an already computer-ranked list of 100+ comparables. based on certain criteria such as condition, quality, design, view. A "person" could come up with a fairly accurate estimate of sale price as of some date, with a casual inspection of the property and then finding its optimal location or fit in a ranked list. A small online program could help expedite things. Although some homes in the top or bottom 5% can be a bit of a problem at times.
I did the entire county of San Mateo. I would say it took me 2.5 weeks the first time doing this in September (although it took longer because I have other things to do). If I had to do it again, them maybe 1 week. - And the process still needs to be speeded up to update the model on a regular basis. To take in a much larger county such as Santa Clara, would require far more work than I am interested in doing. You'd have to create a team to deal with that. San Mateo County (600K+ homes ) is manageable and a cool county to work with.
The future residential appraiser will do this sort of thing. He will build models for counties - and hand them off to inspectors to use. The old residential appraiser disappears. The new one appears. And it is simply new advanced technology with the improvements:
1. Consistency.
2. Objectivity.
3. Speed.
4. Accuracy.
So, appraisal as a profession remains. But, the new appraiser has to be versed in more skills:
1. Non-parametric statistics and data mining.
2. Inspection and measurement technology.
3. Media technology.
4. Database technology and programming.
...
But the GSEs are holding this all back through absolute idiocy. It's so shameful. All those PhD.s are at their disposal and they can't make progress but instead regress into more of a mess. Of course its the whole profession; only for residential the GSEs play a central role.