How to Switch Appraisal Software Without Losing a Decade of Comps

If you have been appraising for ten years, your old software is holding something you can't easily replace: thousands of reports, tens of thousands of comps, and every adjustment you ever had to defend to a reviewer. That's the real reason most appraisers put off the decision to switch appraisal software. The forms are not the scary part. Losing the history is. With UAD 3.6 becoming mandatory for new submissions on November 2, 2026, a lot of appraisers are being pushed into the decision this fall anyway. This guide walks through how to make the move without losing a decade of comps, without breaking USPAP record keeping, and without missing a week of orders.

Key takeaways

• Export before you shop. Your report archive, in MISMO 2.6 GSE XML plus PDF, is the asset. Get it out and back it up first.
• Old UAD 2.6 reports don't become UAD 3.6 reports. They become a comps history and an adjustment data set.
• USPAP workfile retention doesn't end when your subscription does. Plan for at least five years of access.
• Run the old and new programs side by side through the UAD 2.6 wind-down. Revisions to 2.6 reports stay in 2.6.
• Judge any new program on its UAD 3.6 output, your data's portability, and the true yearly cost.

Why so many appraisers are switching in 2026

Every few years someone threatens to change software and then doesn't. The friction is real: the muscle memory, the add-ons, the comps database, the custom boilerplate you built in 2014. This year is different for three reasons.

First, the form itself is changing. The redesigned URAR under UAD 3.6 replaces the familiar stack of forms (the 1004, 1073, 1025, 2055 and their variants) with one dynamic report, delivered as MISMO 3.6 XML. Freddie Mac's UAD and Forms Redesign FAQ is clear that the mandate is keyed to the UCDP submission date, not the effective date of the appraisal. Whatever program you use, you are learning a new report. If you have to relearn anyway, it's a natural moment to ask whether your current tool is the right one. Our complete guide to UAD 3.6 covers the form change in depth.

Second, the timeline is short. Limited production began in September 2025, lenders could choose 2.6 or 3.6 from January 2026, and the mandate lands November 2, 2026. After that, UAD 2.6 gets an exception period, then reduced functionality, then becomes Fatal for new submissions on May 20, 2027, and is retired June 28, 2027. The UAD 3.6 deadline timeline has every date.

Third, cost. Tiered desktop appraisal software often runs $1,500 to $3,500 a year once you add the pieces a working appraiser actually uses. Fees in many markets have barely moved in a decade. When a renewal notice arrives in the same month as a form overhaul, people do the math. We break that math down in appraisal software pricing in 2026.

What you are actually moving

Before any steps, be precise about what "my data" means. It's four different things, and they move differently.

The first row is where your comps live. Every UAD 2.6 report that went through UCDP had to be delivered as MISMO 2.6 XML, so most desktop programs can produce that file for any report you finished. That's why it is the backbone of every migration: it's a shared standard, not one vendor's private format.

The third row is the one appraisers forget. A workfile is more than the report. It's whatever you relied on: the MLS printouts, the assessor card, your inspection notes, the photos you didn't use, the email where the lender changed the intended use. No software converts that. You copy it and keep it.

Step 1: Inventory your archive before you touch anything

Spend an hour finding out what you have. Open your current program and note:

1. How many reports it holds, and how far back they go.
2. Where the files live on disk (often a data folder under Documents or a shared drive).
3. Whether older years are in a different place: an old computer, an external drive, a previous version of the program.
4. Which report types you have: 1004, 1073, 1025, 2055, desk reviews, non-lender work.
5. Any reports still open: drafts, pending revisions, assignments on hold.

Write it down. You'll use this list to check the exports later. If you're a firm with trainees, do this for every workstation. Reports have a way of living on one person's laptop.

Watch out: if your program stores reports in a cloud account rather than on your disk, find out now how you get them out and whether access ends when the subscription ends. Ask the vendor's support in writing.

Step 2: Export every finished report as MISMO 2.6 GSE XML

This is the step that saves your comps. In your current program, look for an export option labelled something like MISMO 2.6, GSE XML or UAD XML. Menus vary by vendor and version, so if you don't see it, ask the vendor's support how to export reports in bulk as MISMO 2.6 XML. Ask specifically whether a batch export exists. Exporting 6,000 reports one at a time is a weekend you don't want.

A few practical points:

• Export everything, not just recent years. Old comps still teach you what a garage or a bath was worth in a town over time.
• Keep the file names meaningful. File number plus address is ideal. If the export names files by internal ID, that's fine, as long as you keep the PDFs alongside.
• Zip by year. A zip per year is easy to back up, easy to check, and easy to upload.
• Expect some failures. Very old reports from before the original UAD, or non-GSE work may not export as UAD XML at all. That's normal. Those become PDF-only records.

The details for specific programs are in two companion guides: migrating from ClickFORMS and leaving ACI, TOTAL or other desktop appraisal software.

Step 3: Export or collect the PDFs and the workfiles

The XML is your data. The PDF is your record of what you actually delivered. Keep both. If you saved delivered PDFs in each report folder, you're done with this part. If not, print or export each final report to PDF from the old program while you still can.

Then copy the workfile folders as they are. Don't reorganize them during the move. A reviewer or a state board asking about a 2022 assignment wants to see what was in the file then, not a tidied version.

Step 4: Back up twice, in two places

Before you upload anything anywhere, make two copies of the full export (XML zips, PDFs, workfile folders):

1. One on a drive you control, like an external disk kept somewhere other than your office.
2. One in a separate cloud storage account that you, not a software vendor, own.

USPAP's Record Keeping Rule requires an appraiser to keep the workfile for at least five years after preparation, or at least two years after final disposition of a judicial proceeding in which the appraiser testified, whichever is later. It also expects you to keep custody of the workfile or have appropriate arrangements for retention, access and retrieval with whoever does. Read the current edition on The Appraisal Foundation's site, and check whether your state adds its own retention rules. Switching software doesn't pause any of that. A backup you own is the simplest way to stay compliant regardless of which vendors you use later. For more on that topic, see desktop vs. cloud appraisal software and USPAP record keeping.

Note: this is general information, not legal advice. If you have testimony pending or a complaint open, talk to your attorney before you change how any workfile is stored.

Step 5: Verify the export against your inventory

Now go back to the list from Step 1. Count the XML files per year and compare to the report counts in your old program. Open a dozen at random across the years: a recent 1004, an older condo, a 2–4 unit, an exterior-only. Check that the subject address, the comps and the adjustments are actually in the file. An XML file that's 4 KB is probably empty or failed.

If a year is short, find out why before you move on. Most gaps come from reports stored in a second data folder, or from an earlier version of the program on an old computer.

Step 6: Choose the new program on criteria, not a demo

Demos are built to look good on a simple 1004 in a suburb. Your work isn't always that. Before you commit, test these:

• UAD 3.6 output: does it produce MISMO 3.6 XML, a URAR PDF and the delivery package? Does it check your report against the GSE compliance rules before you send it?
• Your property types: 1–4 units, condo, PUD, and whatever else your clients order. Ask directly which types are fully supported today.
• Import: can it read your MISMO 2.6 archive, and what does it do with it?
• Portability: can you export your data out of it later, at any time, without a fee?
• Cost: what's the real yearly cost with the add-ons you'll need?
• Your workflow: comps grid speed, sketch, photos, maps, and how revisions are handled.

Check the GSE vendor listings too. Fannie Mae publishes an Integrated Vendor List that tags UAD 3.6 software providers, and Freddie Mac publishes its own software providers list. A listing there is a vendor verification, not an approval of you or your reports. Our honest buyer's guide to UAD 3.6 appraisal software has a full checklist table you can print.

Step 7: Import your archive into the new program

What happens at import depends on the program. Here is what to look for, and what Carat does with it.

A good import should:

1. Accept bulk files. Zips of hundreds or thousands of reports, not one file at a time.
2. Show you a count. Files received, reports parsed, comps extracted, files that failed.
3. Not guess. If a field is ambiguous (a garage described in free text, a GLA that doesn't add up, a date in an odd format), it should be flagged, not silently filled into a future report.
4. Turn the data into something useful. A list of PDFs is storage. A searchable comps history is a tool.

Carat's legacy import takes ClickFORMS reports or any MISMO 2.6 GSE XML export. You upload the files or zips (zips are expanded on upload), and it parses every report into a searchable comps history: the subjects you appraised and every comp you used, with the adjustments you made. From that history it builds median adjustment rates by town and price tier, drawn only from your own work. When a town is too thin for a specific price tier, it falls back to the town as a whole, then the county. Anything unclear goes to a review queue where you can see it, never silently into a report.

That's different from conversion. Your 2019 1004 doesn't become a UAD 3.6 report, and it shouldn't. The redesigned URAR asks for things the old form never collected. What carries forward is your knowledge: what you paid for a bath in that subdivision, and which sales you already verified. For a deeper look at using your history this way, read data-driven adjustments from your own past reports.

Tip: import the oldest years first and check the review queue before the rest. If one quirk shows up across hundreds of 2015 reports, you'll find it once instead of 3,000 times.

Step 8: Rebuild your setup in the new program

The unglamorous part. Before you cancel anything, copy out:

• Your firm name, address, license numbers and expiration dates for every appraiser and trainee.
• E&O carrier, policy number and expiration, plus the declarations page as a PDF.
• Your signature image, if you use one.
• Standard comment text: scope of work, extraordinary assumptions you reuse, market conditions boilerplate, FHA and VA language.
• Client and AMC contact lists.

Put them into the new program's firm profile once. In Carat, every new report starts from the firm profile, so license and E&O exhibits attach to every report automatically and you aren't retyping them on the 9pm revision.

A word on boilerplate. UAD 3.6 moves a lot of what used to be free-text comment into structured fields. Some of your old addenda won't have a home, and some shouldn't. This is a good time to cut comments that were only there to satisfy a reviewer on a form that no longer exists.

Step 9: Run both programs in parallel through the UAD 2.6 wind-down

Don't cancel the old program the day you sign up for the new one. There are two good reasons.

Revisions. If a report was submitted to UCDP in UAD 2.6, Freddie Mac says revisions submitted to that existing Doc File ID stay in UAD 2.6. If a lender sends a revision request in December on an October 2.6 report, you need the program that made it. UAD 2.6 is Fatal for new submissions starting May 20, 2027, and only revisions of prior 2.6 reports are accepted until retirement on June 28, 2027. Plan to keep at least read-and-revise access until your last 2.6 report is closed out.

Trust. Do your first five or ten UAD 3.6 reports in the new program while the old one is still there. If something feels wrong, you have a fallback and no client sees the learning curve.

A simple plan for a one-person shop:

For a firm, stagger it. Move one appraiser first, fix the setup issues they find, then move the rest.

Step 10: Your first UAD 3.6 report in the new program

Pick a straightforward assignment, not your hardest rural 2–4 unit with an ADU. Then work through it end to end:

1. Start the report and check what fills in automatically. In Carat the subject's address, parcel ID, coordinates and public-record facts fill in from parcel and tax-roll data where it's available.
2. Pull comps from your own history where they fit. A sale you verified last spring is still a sale you verified.
3. Look at the town and price-tier medians beside your adjustments. They're a check against your own past reasoning, not a replacement for this market's evidence.
4. Sketch the house. Carat calculates area to ANSI Z765 and the GLA fills the report. If you're new to measuring under the standard, see ANSI Z765 and GLA under UAD 3.6.
5. Run the readiness checks. Carat's AI-powered checks run hundreds of the GSE Appendix H-1 compliance rules while you work, and each finding links straight to the field. Fix the Fatal ones and read every Warning.
6. Build the package: MISMO 3.6 XML, the URAR PDF, and the images in the UCDP-ready zip. Then you or your client upload it. Carat never submits or signs for you.

Use the UAD 3.6 readiness checklist as a second pair of eyes on that first report.

Mistakes that cost appraisers their history

These come up again and again when an appraiser changes appraisal software.

• Cancelling first, exporting second. If access ends with the subscription, so does your easy export. Export first, always.
• Exporting only PDFs. A PDF is a picture of the report. You can't search 8,000 PDFs for every sale on Maple Street with a finished basement. Get the XML.
• Forgetting the second computer. The trainee's laptop, the old desktop in the closet, the 2017 install on a drive. Check them all.
• Trusting a single backup. One external drive is one dropped bag away from gone.
• Treating the import as gospel. Old data has old mistakes: a comp's GLA you later corrected, a typo in a sale price. That's why a review queue matters and why medians beat single values.
• Moving mid-revision. Finish open revision requests in the program that made the report.

What a good switch feels like a month later

If you do this in order, here is what you end up with. Your complete archive is exported, backed up twice and verified. Your workfiles are intact and retrievable for as long as USPAP and your state require. The old program is still there for the last UAD 2.6 revisions. The new one is doing your UAD 3.6 work, and instead of starting from a blank comps grid, you're starting from ten years of your own verified sales and your own adjustment history.

That last part is what makes switching worth it. Your past reports aren't dead weight in an old program's database. They're the best data set you own, because you built it, you inspected those houses and you know which numbers you trust.

If you're weighing Carat, it's $99 a month per appraiser with unlimited reports, no tiers and no per-report fees, month to month, and you can export any time. See the details on the pricing page, or create an account and import your archive.