By Joseph T Ellington Jr – Licensed Residential Appraiser, Capital Valuations. Updated September 2026.
AVMs and appraisals: which value question are you asking?
An automated valuation model (AVM) estimates a home’s value using data and statistical methods. An appraisal is a defined assignment performed by an appraiser who considers the relevant property and market evidence under a stated scope. Neither an AVM nor an appraisal guarantees a sale price. This article explains where each can fit and why a difference between them is a question to investigate, not proof of wrongdoing.
What an AVM can and cannot see
Models can quickly analyze recorded sales and property records across many homes. Their outputs may be less informative when records lag behind a renovation, a property’s condition is unusual, or few truly comparable sales exist. A model may incorporate many data sources; without its methodology and confidence information, a single number tells you little about uncertainty. A human appraiser also must verify data and support the opinion rather than assume every record is correct. Our history of appraisal methods and data puts these verification responsibilities in context.
| Question | AVM estimate | Residential appraisal |
|---|---|---|
| Speed | Often automated | Requires assignment-specific research |
| Property observation | May rely on available records or other inputs | Depends on the appraisal scope; not every report includes an appraiser’s site visit |
| Explanation | Varies by model and user access | Report explains the valuation analysis and relevant limitations |
| Loan use | Lender/investor policy controls | Lender/investor policy controls |
What current mortgage policy says
Federal agencies adopted quality-control standards for covered AVMs used in certain mortgage credit decisions and securitization determinations. Fannie Mae also offers value acceptance for eligible lender casefiles. That is a lender and investor decision, not a homeowner’s ability to waive every appraisal by pointing to an online estimate. Fannie Mae says lenders must order an appraisal when they have reason to believe one is warranted based on additional property information or events.
How to compare a model output with an appraisal
- Check the addresses, property types, and dates on both estimates.
- Look for missing additions, condition changes or incorrect area in the underlying records.
- Ask whether the model gives a range or confidence indication, not only a point number.
- Read the appraisal’s comparable sales, adjustments and reconciliation before deciding whether an error exists.
- For a lender-ordered appraisal, raise specific facts through the lender’s ROV process.
Why a private appraisal may still be useful
An owner considering a sale, estate valuation, divorce, or unusual property may need a defined value date, intended use, and explanation of evidence. Our guides on CMA versus appraisal and comparable sales answer different related questions. Contact Capital Valuations for a private residential assignment in Hampton Roads; tell us the purpose first.
