.......
It really is case-by-case, there is no one-size-fits-all answer to an SFR with ADU, with or without multiple utility connections. It depends on the salient facts found onsite (utility connections), HBU, current use, allowed use, and to a limited extent, which underwriter will be reviewing the appraisal. I mean, the lot of us here at AF generally can't agree on anything - why should we expect reviewers and UWs to be any better when it comes to "being on the same page" even if we all have the same page to read from.
You really have to use common sense and be sure that the FORM "dictated" doesn't make your analysis absurd.
I did an urban townhouse of some 5,800 sq.ft. a some years ago; there was a small apartment in the property, with separate utilities, rented at $650/mo.
High sale for 2 units at the time was about $400k, while a SFD of that size & condition, & in that location was easily worth $750k.
Was I supposed to
devalue the property by hundreds of thousand of dollars because of the rental unit?
Was I supposed to adjust for the subject's
extra 3,800 sq.ft. over 2,000 sq.ft. duplexes?
Or, was I supposed to use SFD sales of similar size, location & quality?
In that marketplace, any potential buyer would love to have that rental unit, if not as a rental, then as guest quarters, or maid's / au-pair quarters.
It was a SFD with an accessory unit - and seperate utilities be
d@mmed.
.