I must admit that I have gotten into a habit of giving short shrift to H&B analysis when doing SFR appraisals on quarter acre lots in R1 zoning, especially when it comes to reporting. In such cases, I rarely report all four methods of analysis, nor do I usually discuss the difference between as vacant or as improved, usually using a generic comment as to the allowed legal use and the apparent economically feasible uses being as is. This is not to say that, when doing jobs in more rural, less stringent zoning, HBU does not take on becoming a job in itself. But, despite the fact that such analysis and reporting has been required by USPAP for many years, it has only been recently when clients have begun to balk at 104's that basically leave the HBU discussion blank (it is still not uncommon to see this on the rare occasions when I see other's work)
BTW, as a residential appraiser I have always wondered how I am supposed to properly do an HBU analysis when one legal possibility is commercial. As I am not trained or qualified to estimate the comparative of a property in commercial use, how can I fully perform this? The result is that I tend to turn down jobs that present a serious chance of having a more valuable use as commercial as I would not feel qualified to defend my opinion.