There are always the words "not readily accessable or observable" that one will have already mentioned at least twice in the report, and equally supported by inclusion of a flash-photo from under that deck that shows the definite limitations created by the construction OF that deck where it is...and thus a distinct inability for one to view a location which, in most other NORMAL situations, WOULD be observable. The appraiser is NOT responsible for property abnormalities.
Mr. Client....your borrower/homeowner has this unique aspect about HIS property. I've done my appraisal to the best of my ability, noting this one limitation, and someone needs to consider just how this transaction is to proceed.
(to Frederick)...Any chance that there is a horizontal heating unit or short-stubby water heater down there in the crawlspace ? If so, how might they be removed if any replacement became necessary in the future ? Perhaps, building that deck where they did was NOT such a good idea, after all.
Ah hah.....remove the deck, do the head-and-shoulders thing inside the access hatch, and then put the deck back in place ! Or, have the homeowner tell his son to crawl under there, open the access hatch, stick his arms and head in there, and take one flash picture to the left, one straight ahead, and one to the right. Hand the camera back to the appraiser, have him check if any are usable for the report, and save them all for the workfile. How serious is the appraiser's client to thinking outside-the-box ? How seriously does this person want their re-fi ? - - We do not know exactly who "the guy" is within the entire scenario.