UAD 3.6: What the New Appraisal Data Standard Means for Home Buyers and Sellers

If you are buying, selling, or refinancing a home, a major behind-the-scenes change to how your property gets appraised is already underway. Fannie Mae and Freddie Mac have jointly rolled out UAD 3.6 — a sweeping update to the Uniform Appraisal Dataset — and it represents the most significant overhaul to residential appraisal reporting in more than a decade.

For most borrowers, the change will be invisible. But understanding what it is, why it matters, and how it could affect your transaction can help you avoid surprises at the closing table.

The Uniform Appraisal Dataset (UAD) is the standardized data framework that governs how licensed appraisers collect, format, and submit residential appraisal reports to Fannie Mae and Freddie Mac (the GSEs). Every conventional loan that gets sold on the secondary market relies on appraisal data that conforms to UAD standards.

UAD 3.6 is the latest version of that framework. It replaces the legacy URAR (Uniform Residential Appraisal Report) — a form-based PDF that has been largely unchanged since 2005 — with a new, data-centric XML-based submission format. The new format captures far more granular property data, standardizes how appraisers describe condition and quality, and enables the GSEs to run more sophisticated automated analysis on appraisal submissions.

• Structured data over narrative forms. Instead of a PDF with fill-in fields and open-ended comment boxes, appraisers now submit structured XML data. This makes the information machine-readable and allows Fannie Mae and Freddie Mac to flag inconsistencies or outliers automatically.

• Expanded condition and quality ratings. The legacy C1–C6 and Q1–Q6 rating scales are retained, but UAD 3.6 adds more granular sub-fields that require appraisers to document specific property features — room counts, finish quality, functional utility, and deferred maintenance — in a standardized way.

• More comparable sale data points. Appraisers must now capture additional data on each comparable sale, including above-grade and below-grade living area breakdowns, garage and parking details, and energy-efficiency features. This gives the GSEs richer data to validate the appraiser's adjustments.

• Standardized market condition reporting. The new format requires appraisers to document local market trends using standardized fields rather than free-form narrative, making it easier for lenders and the GSEs to assess whether the appraiser's market analysis is consistent with observed data.

• Digital submission workflow. UAD 3.6 is designed for end-to-end digital delivery through appraisal management companies (AMCs) and lender portals, reducing manual re-keying and the errors that come with it.

The legacy appraisal system had well-documented limitations. Appraisal reports were submitted as PDFs, which meant the GSEs had to parse unstructured text to extract data — an error-prone process that made it difficult to identify appraisal bias, detect inflated values, or benchmark appraisers against market data at scale.

UAD 3.6 is part of a broader GSE initiative to modernize the appraisal process, improve accuracy, and address longstanding concerns about appraisal bias — particularly in communities of color. By capturing more granular, standardized data, Fannie Mae and Freddie Mac can run better statistical models to identify outliers and support fair lending oversight.

For lenders, the new format also reduces repurchase risk. When appraisal data is structured and machine-readable, it is easier to validate compliance before a loan is delivered to the GSEs.

Appraisers nationwide are adapting to new software, new data entry workflows, and new submission requirements. During the transition period, some appraisers may take additional time to complete reports as they get up to speed. This is a temporary friction point, not a systemic delay.

Because UAD 3.6 requires more granular documentation of property features and comparable sales, appraisals completed under the new standard will generally be more thorough and easier to review. If you ever need to dispute an appraisal value, the structured data format makes it clearer exactly how the appraiser arrived at their conclusion.

Fannie Mae's Collateral Underwriter (CU) and Freddie Mac's Loan Collateral Advisor (LCA) — the automated tools lenders use to assess appraisal risk — will be updated to leverage UAD 3.6 data. This means appraisals that are well-supported by comparable sales and market data will move through the review process more smoothly, while outliers will receive more scrutiny.

UAD 3.6 applies to full appraisals. The GSEs' appraisal waiver programs (where no appraisal is required) and hybrid/desktop appraisal options remain available for qualifying transactions. If your loan qualifies for a waiver, UAD 3.6 does not affect you.

If you are selling a home, UAD 3.6 has a few practical implications:

Condition documentation matters more than ever. Because appraisers must now document condition and quality in standardized, machine-readable fields, deferred maintenance or below-average condition ratings are harder to obscure in narrative text. Homes in excellent condition will benefit; homes with deferred maintenance may see more conservative valuations.

Comparable sale selection is more transparent. The expanded comparable sale data requirements make it easier for lenders and the GSEs to evaluate whether the appraiser selected the most appropriate comps. If your home is in a neighborhood with limited comparable sales, the appraiser's methodology will be more visible and subject to more scrutiny.

Pricing your home accurately from the start is more important. In a market where appraisals are more data-driven and automated review tools are more powerful, overpriced listings that require an appraisal to "hit the number" face greater risk of a low appraisal. Working with an experienced agent who understands current comparable sales is essential.

Fannie Mae and Freddie Mac began accepting UAD 3.6 submissions in early 2025, with a phased transition period. The GSEs have communicated that the legacy URAR format will eventually be retired, though lenders and AMCs have been given time to update their systems and workflows.

As of mid-2026, most major lenders and AMCs have updated their platforms to support UAD 3.6 submissions. If you are working with a lender or AMC that has not yet transitioned, you may want to ask about their timeline.

At Resolution Equity, we work with appraisers and AMCs every day. Our team stays current on GSE guideline changes — including UAD 3.6 — so we can help you understand how appraisal requirements affect your specific transaction.

Whether you are purchasing a single-family home, refinancing a multi-unit property, or financing a mixed-use building, we will walk you through every step of the process — including what to expect from the appraisal.

Ready to get started? Contact our team or apply online to speak with a licensed California mortgage professional.

Resolution Equity is a licensed California mortgage broker. DRE #02443787 | NMLS #2852331. All loans subject to credit approval. This article is for informational purposes only and does not constitute legal, financial, or appraisal advice.