Why It Matters
You'll encounter an appraisal review when a lender or appraisal management company (AMC) has questions about the initial appraisal. The review appraiser doesn't visit the property — they work from the original report, public records, and MLS data to determine whether the original value holds up to scrutiny. A review can result in three outcomes: the original value is upheld, revised upward, or revised downward. If the value is revised downward, your loan amount may shrink, your deal may need to be renegotiated, or you may have to cover the gap in cash. Understanding how the process works — and what triggers it — lets you anticipate problems before they stall your closing.
At a Glance
- Who orders it: Lenders, AMCs, and sometimes secondary market investors (Fannie Mae, Freddie Mac)
- Who performs it: A second licensed or certified appraiser — usually at the same credential level as the original
- Property visit required: No — appraisal reviews are typically desk reviews
- Possible outcomes: Value upheld, value revised upward, or value revised downward
- Common triggers: Unusual comp selection, large adjustments, suspect property condition claims, or a value that falls far above or below the contract price
- Timeline: 3–7 business days once the reviewer receives the file
How It Works
The trigger. An appraisal review is almost always lender-initiated. When an underwriter flags a concern — comps that are too far away, too old, or too dissimilar; adjustments that seem inflated; a condition rating that doesn't match photos — they order a review before approving the loan. The same thing happens when a deal's appraised value comes in significantly above the sales price and the lender worries the original appraiser was influenced by the transaction or overly optimistic about the market.
The desk review process. The review appraiser receives the original appraisal report and conducts an independent analysis. They pull their own comparable sales from the MLS and public records, recalculate adjustments, and evaluate whether the original appraiser's selection criteria and methodology are consistent with standard appraisal practice. They're not re-appraising the property from scratch — they're auditing the existing work.
Scope matters. A basic desk review checks whether the report is internally consistent and whether the comps are reasonable. A more rigorous field review adds a drive-by inspection of the exterior. In high-value transactions or complex properties, lenders sometimes order a full appraisal review with complete re-inspection — though that's less common and more expensive.
The adjustment to effective age and condition. One of the most contested areas in any appraisal review involves how the original appraiser rated the property's condition and estimated its effective age. If the original report claims the property has been fully updated and assigns it a lower physical depreciation, the reviewer will scrutinize photos and tax records closely. Overstated condition ratings inflate value and are a common target.
Value revision mechanics. If the review appraiser finds the original value unsupported, they note specific deficiencies and provide a revised value opinion. That revised figure typically supersedes the original in the lender's underwriting system. Your loan is then recalculated against the lower number.
Real-World Example
Hiro is under contract to buy a single-family rental for $387,000. The original appraisal comes in at $392,000 — right where the deal needs it. Two weeks later, his loan officer calls: the AMC flagged the appraisal for review because two of the three comps were over a mile away in a higher-end subdivision, and the adjustments looked aggressive.
The review appraiser pulls four closer comps from the same zip code, all sold within 90 days. After re-running the adjustments, the reviewer comes back with a revised value of $371,000 — $21,000 below the original.
Hiro now has three options: renegotiate the purchase price down to $371,000, bring an extra $21,000 in cash to close, or walk away. The seller agrees to split the difference and drop the price to $379,000. Hiro covers the remaining $8,000 gap out of pocket. The deal closes — but the appraisal review cost him two weeks and a smaller down payment than he planned.
This scenario illustrates why understanding BPO pricing, functional obsolescence, and external obsolescence matters when you're evaluating comps yourself. The more accurately you can read a market before the appraiser does, the fewer surprises you'll face at the lender's desk.
Pros & Cons
- Protects lenders — and by extension, buyers — from inflated values — A credible review process catches appraisals that don't reflect market reality before the loan funds
- Creates an appeal path when the original appraisal is wrong — If you believe the original appraiser used poor comps or missed key features, a review gives you a mechanism to challenge the value
- Adds a professional check on physical depreciation and condition ratings — Reviewers catch overstated updates and condition scores that would otherwise inflate values
- Improves overall appraisal quality — Appraisers who know their work may be reviewed tend to be more rigorous in comp selection and adjustment methodology
- Can delay closing by 1–2 weeks — Adding a review round-trip to an already tight timeline creates real risk of rate lock expiration or seller impatience
- A downward revision can blow up a deal — If the reviewed value comes in below contract price, the borrower must cover the gap, renegotiate, or walk
- You have limited visibility into the process — Borrowers rarely see the review report; they just learn the outcome through the lender
- Not always accurate — A review appraiser working from a desk can miss property-specific details that only on-site inspection would reveal, occasionally producing an unfair downward revision
Watch Out
Know the triggers before you go under contract. The most common appraisal review triggers are: comps located more than 0.5 miles away in urban markets (or more than 1 mile in suburban markets), adjustments greater than 10% of the comp's sale price, condition ratings that seem inconsistent with listing photos, and a contract price that diverges significantly from the appraised value. If your deal has any of these flags, expect the possibility of a review before you're in contract.
Prepare your own comp evidence in advance. If a review does come back with a revised downward value you think is wrong, you can ask your lender to submit a Reconsideration of Value (ROV). To succeed, you need comparable sales data the reviewer didn't consider — specific addresses, sale dates, and square footage. Build that file before you need it.
Watch the external obsolescence angle. Review appraisers are particularly alert to properties where the original appraiser ignored negative neighborhood factors — highway proximity, industrial neighbors, declining school ratings. If your property has any of these, make sure the original appraisal addressed them explicitly. An unexplained silence in that area is an invitation for a downward review.
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The Takeaway
An appraisal review is a quality-control mechanism that protects the loan from unsupported values — but it can also become an unexpected obstacle in your transaction. The key is to understand what triggers a review before you're under contract, build your own comp analysis to spot potential issues early, and have a plan for the three possible outcomes. If the original value holds, you're fine. If it gets revised downward, you need to know your walk-away number before the call comes in.