If you're planning to buy a home this fall, there's a change happening behind the scenes that's worth knowing about before you're mid-contract. Starting November 2, 2026, every appraisal on a conventional loan sold to Fannie Mae or Freddie Mac has to use a new format called UAD 3.6, and it's the biggest change to how appraisals get done in decades. It's not something you'll need to manage yourself, but it could affect your timeline and your closing costs, so I'd rather you hear about it now than get surprised by it in the middle of a transaction.
What's actually changing
The old system used separate static forms depending on property type. UAD 3.6 replaces all of that with a single dynamic appraisal report that adjusts itself based on the property and how it's being valued. A few of the bigger shifts inside it: “gross living area” gets split into four separate measurements instead of one number, condition and quality now get rated separately for the interior and exterior, and features like ADUs, outbuildings, energy efficiency, and even broadband access get their own dedicated fields instead of a passing mention in an addendum.
None of this changes what an appraisal is for. It's still there to confirm your home is worth what you're paying for it. But it does mean appraisers are collecting a lot more structured data per report than they used to.
Why your appraisal might cost more
That extra data collection has a real cost, and appraisers are already telling customers they expect to pass some of it along. In a recent survey of 900 appraisers, 52 percent said they expect to raise their fees under the new format, with increases ranging anywhere from $25 to more than $200 per appraisal. A separate survey from McKissock found 41 percent expecting increases, with several appraisers estimating the new report takes 25 to 40 percent longer to complete, and a few outliers on larger or more complex properties expecting fees to jump 200 to 300 percent.
To be clear, that's not universal. Plenty of appraisers expect their fees to hold steady, at least at first. But if your appraisal comes back a bit more expensive than you were quoted a year ago, this is almost certainly why.
Why it might take longer too
Timeline is the bigger practical concern. In that same 900-appraiser survey, 63 percent expect turnaround times to stretch out, most commonly by one to two additional days, while only 3 percent expect things to move faster. Part of that is a straightforward learning curve. Appraisers are switching to new software and new terminology this fall, and most of them will still be completing some appraisals in the old format at the same time, since the transition isn't a clean cutover for every lender and loan type.
For you as a buyer, a day or two might not sound like much, but appraisal delays have a way of cascading. A late appraisal can push back your loan documents, which can push back your closing date, which can put your rate lock at risk if it wasn't built with enough cushion. None of that is guaranteed to happen, but it's exactly the kind of thing that's easier to plan around than to fix after the fact.
What I'd suggest if you're buying around this window
If your contract is going to close anywhere near November 2, a few things are worth doing proactively. Ask your lender directly how they're handling the UAD 3.6 transition and whether they're building extra time into their appraisal timeline for loans closing this fall. Confirm your rate lock period has enough padding to absorb a short delay rather than one that expires the same week you expect to close. And if you're buying a home with an ADU, an unusual layout, or anything that doesn't fit neatly into a standard appraisal, expect the report itself to look different and possibly take a little longer, simply because there's more to document now.
If you do get your appraisal back and the format looks unfamiliar, that's normal and not a red flag. “Finished Area Above Grade” replacing “Gross Living Area” is a vocabulary change, not a value judgment on your home.
My take
This isn't a reason to delay your home search, and it's not something that should scare you off a fall closing. It's just one more moving piece that a good lender and a good agent should already be tracking for you. If you'll be on the hunt for a new home soon, let's talk about your specific timeline and make sure you have room to absorb a hiccup if one comes up.
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