Fannie Mae Appraisal Guidelines: What Every Homeowner Should Know

I did not know Fannie Mae had anything to do with my appraisal until I needed to dispute one. Then I found out that almost every conventional mortgage in America is subject to Fannie Mae standards. That includes the appraisal.

Understanding these guidelines puts you in a much stronger position when something goes wrong.

Who Fannie Mae Is and Why It Matters

Fannie Mae is a government-sponsored enterprise that buys mortgages from lenders. Because lenders want to sell their loans to Fannie Mae, they follow Fannie Mae's rules. That includes requiring appraisals that meet Fannie Mae's standards, which are published in a document called the Selling Guide.

When an appraiser values your home for a conventional loan, they are following Fannie Mae guidelines whether they mention it or not.

What the Guidelines Say About Comps

Fannie Mae requires appraisers to use comparable sales that are "the most similar" to the subject property. The guidelines specify that appraisers should prioritize recent sales, geographic proximity, and similarity in features. If better comps exist and the appraiser did not use them, that is a problem under Fannie Mae standards.

The Selling Guide also says that at least one comp should have sold within 90 days of the appraisal date. If all three comps are more than 90 days old and recent sales exist, the appraiser is not following the guidelines.

What the Guidelines Say About ROVs

Fannie Mae guidance published in 2022 updated the ROV process significantly. Lenders are now required to have a formal ROV policy. They cannot simply dismiss your request. The appraiser must review any new comps or evidence you provide and respond in writing to each point.

This means your ROV has formal standing. The lender cannot ignore it. The appraiser cannot refuse to engage with it.

What the Guidelines Say About Adjustments

Fannie Mae requires that adjustments reflect market behavior. They should be based on paired sales analysis or other market data, not arbitrary numbers. If the appraiser assigned a $3,000 adjustment for a feature that buyers in your area consistently pay $15,000 for, that adjustment does not meet the standard.

How to Use This Information

When you write an ROV, you can reference Fannie Mae guidelines directly. Saying "under Fannie Mae Selling Guide B4-1.3-09, the appraiser is required to use the most geographically proximate comps available" carries more weight than a general complaint.

WorthMore.ai is built on Fannie Mae and USPAP standards. It reads your report against those guidelines and shows you where the appraiser may have fallen short. That is a good place to start if you have questions about your appraisal.