An automated valuation model (AVM) is software that estimates a property's value from public records, past sales and listing data, without anyone visiting the home. AVMs are fast, but they can't see condition and get little fresh data on a tenant-occupied rental, so check any AVM against three to five recent sold comps before you borrow or buy based on it.
Key takeaways
- An AVM estimates value with a computer model built from public records, prior sales and listings, and it generally doesn't include an inspection of the property.
- A tenant-occupied rental usually has no recent listing, photos or asking price, so the model has less to work with than it does on a home for sale.
- A confidence score based on forecast standard deviation (FSD) can be turned into dollars: a 10% FSD on a $300,000 estimate means roughly a two-in-three chance the true value is between $270,000 and $330,000.
- AVMs miss most on condition, recent rehabs, 2 to 4 unit buildings and areas with few sales, which is where many rentals sit.
- In our example, a $20,000 gap between the AVM and the comps means $15,000 less cash out on a refinance at 75% loan-to-value.
- The federal AVM quality-control rule that took effect October 1, 2025 is written for loans on a consumer's principal dwelling, so don't assume it covers the valuation on your rental loan.
How does an automated valuation model work?
Most AVMs follow four phases, according to First American Data & Analytics, a company that builds them:
- Gather data. Public records, listings, past sales and appraisals, and location data.
- Clean it. Cleanse and normalize the records so they line up.
- Model it. Run the data through one or more valuation methods.
- Report it. Return a value, a confidence score, a value range and the comps the model leaned on.
Regulators put it more simply. A 2006 NCUA legal opinion calls an AVM "a computerized property value system using comparable or repeat sales indexes" and notes that it generally doesn't include an onsite exam. That last point matters most for rental investors, as you'll see below.
What does "AI" add to an automated valuation model?
Older AVMs lean on two methods. A hedonic model puts a price on features like square footage, bedrooms, lot size and location, while a repeat-sales model tracks how the same home's price changed between past sales and applies the local trend since then. Freddie Mac's own model blended both, per a 2018 FHFA Inspector General report.
An "AI automated valuation model" usually means machine learning or an ensemble, where several sub-models each make an estimate and the results get blended into one number. That can catch patterns a simple regression misses. It still learns only from the data it's fed, so if the records don't show the new roof or the soft subfloor, the model doesn't know about them either. For a wider look at where these tools fit, see our guide to AI for real estate investors.
Why are AVMs less accurate on rental properties?
An AVM can only be as good as the data it sees, and a tenant-occupied rental gives it less. When a home is listed for sale, the model can pick up new photos, an updated description and an asking price. A rental that's been leased for years has none of that. The model is left with tax records, the last sale (which may be many years old) and what nearby homes sold for.
So treat an AVM on a rental as a starting range and check it yourself. The confidence score that comes with the value tells you how wide that range is.
What does an AVM confidence score mean in dollars?
Many AVMs report a confidence score next to the value, and that score is often based on forecast standard deviation (FSD). FSD is the model's own estimate of its typical error, shown as a percentage of the value. In basic statistics, about two-thirds of outcomes fall within one standard deviation, so you can turn an FSD into a dollar range by adding and subtracting it from the estimate.
| FSD (Example, $300,000 estimate) | Two-in-three range | Width of range |
|---|---|---|
| 5% | $285,000 to $315,000 | $30,000 |
| 10% | $270,000 to $330,000 | $60,000 |
| 15% | $255,000 to $345,000 | $90,000 |
Flip that around and it's less comforting. At a 10% FSD, about one time in three the value lands outside a range that's already $60,000 wide. Providers define their scores differently, so read your provider's definition before you rely on it.
A neat point estimate can sit on top of a $60,000-wide range. Read the range before you read the number.
Where do AVMs miss on investment property?
The "no onsite exam" point explains most of the misses. An AVM sees what public records and listings show, which leaves out:
- Condition. Deferred maintenance, a dated roof or an old HVAC system don't show up in tax records.
- Recent rehabs. If you renovated without a new sale or listing, the model may still be pricing the old version of the house.
- 2 to 4 unit buildings and small multifamily. Buyers price these on income, and AVMs price on sales and features. For income-driven value, run a cap rate check next to any automated number.
- Thin markets. Rural areas and neighborhoods with few recent sales give the model little to compare against.
How to check an AVM against comps: a worked example
Say you own six rentals and want a cash-out refinance on one of them: a tenant-occupied 3-bed, 2-bath single-family home of 1,500 square feet. The AVM says $300,000 with a 10% FSD. Here's how to check it in about half an hour.
- Pull sold comps from the last 6 months, within about a mile, within 20% of your square footage, with the same bed and bath count.
- Divide each sale price by its square footage.
- Take the median price per square foot, so one odd sale doesn't pull the result.
- Multiply by your property's square footage.
- Adjust for condition the records can't see.
- Compare your number with the AVM and its range.
Those filters are a common starting point, and you can widen them if your area has few sales. Our guide to comparable market analysis for rentals goes deeper on picking comps.
| Comp (Example) | Sale price | Sq ft | Price per sq ft |
|---|---|---|---|
| Comp 1 | $285,000 | 1,450 | $196.55 |
| Comp 2 | $310,000 | 1,600 | $193.75 |
| Comp 3 | $298,000 | 1,520 | $196.05 |
| Comp 4 (renovated) | $322,000 | 1,700 | $189.41 |
The median of the four is $194.90 per square foot (the average of the two middle values, $193.75 and $196.05). Multiply that by 1,500 square feet and you get $292,350.
Now do the part the AVM can't. This house has a dated roof and HVAC, so we take off $12,000, which puts the comp-based value at $280,350. A contractor quote beats a guess here, so use one if you have it. We'll call it $280,000 for planning.
That's $20,000 below the AVM, or about 6.7%. It's still inside the AVM's two-in-three range of $270,000 to $330,000, so the model did what it said it would. It simply had no way to know about the roof.
What does a $20,000 gap mean for a cash-out refinance?
Lenders lend against the appraised value, so the gap flows straight into how much cash you can pull. For this example, assume your lender's maximum is 75% loan-to-value. Don't forget to swap in your lender's actual limit for investment property, since it varies by loan type.
| Value used (Example) | Property value | Loan at 75% LTV |
|---|---|---|
| AVM | $300,000 | $225,000 |
| Comp-based | $280,000 | $210,000 |
| Difference | $20,000 | $15,000 |
If the appraisal lands near the comps, you walk away with $15,000 less than the AVM suggested. If you'd planned to use that cash as the down payment on your next door, that's a real hole in the plan.
So plan the deal around the comp-based number. Run your rental property cash flow on the $210,000 loan and see whether the next purchase still works with less cash.
If it's a DSCR loan, the loan size also changes the payment the lender tests against your rent. Our guide to the DSCR loan shows how to run that test on your own numbers.
Do lenders use AVMs on loans for rental property?
Sometimes, and the newest rules were written mostly with homeowners in mind. Six federal agencies (the OCC, Federal Reserve Board, FDIC, NCUA, CFPB and FHFA) issued an AVM quality-control rule that took effect October 1, 2025. It requires covered lenders to have policies and controls so that AVMs:
- Ensure a high level of confidence in estimates.
- Protect against data manipulation.
- Avoid conflicts of interest.
- Require random sample testing and reviews.
- Comply with nondiscrimination laws.
The rule covers AVMs used to value a mortgage secured by a consumer's principal dwelling, per the CFPB's compliance guide. In other words, it's written for owner-occupied homes. Our reading is that a lender valuing your non-owner-occupied rental may fall outside it, so don't assume those controls apply, and ask your lender how they valued the property.
Fannie Mae changed its wording too. Since September 3, 2025, it says "value acceptance" where it used to say "appraisal waiver," per Fannie Mae's job aid. If a lender knows about something that makes the property ineligible, it can't use the offer and has to order an appraisal. Whether your investment loan qualifies is a question for your lender.
When should you trust the AVM over your comps?
Watch out: If two AVMs disagree by more than their stated error, or your comp-based value falls outside the AVM's range, trust the comps or order an appraisal or broker price opinion before you commit.
Even when your comps land inside the range, as in our example, plan around the comp-based value if you know about condition issues the model can't see. Use the AVM to confirm you're in the right ballpark, then let the comps and your own walk-through set the number you underwrite.
Last updated November 13, 2026.
This is general information, not tax, legal or lending advice. Talk to your CPA, attorney or lender about your situation.
FAQ
Why is an AVM less accurate on a tenant-occupied rental?
A rental that's been leased for years usually has no recent listing, so the model gets no new photos, description or asking price. It works from tax records, an old sale and nearby sales, and it can't see condition or upgrades.
How much does an AVM cost?
We didn't find a published national price. For reference, one lender, JVM Lending, lists inspection-based appraisal waivers at $185 to $250 and a full waiver at no cost, as of October 2026. That's one lender's pricing, so ask yours what they charge.
Can an AVM replace an appraisal?
Generally no. An NCUA legal opinion says an AVM doesn't meet the requirement for an appraisal by a state-certified or licensed appraiser. Some loans can close without an appraisal under programs like Fannie Mae's value acceptance, but that's the lender's call, and it isn't available when the lender knows of factors that make the property ineligible.
What is an AI automated valuation model?
It's an AVM that uses machine learning or blends several sub-models into one estimate. It can find patterns older models miss, but it still can't see condition that isn't in the data.
How many comps should I use to check an AVM?
Three to five recent sold comps is a practical range. Use the median price per square foot so one unusual sale doesn't skew your number.
