Real Estate Appraisal: How It Works, What It Costs, and What to Do If It Comes in Low
Last updated 05/18/2026 by
Ante Mazalin
Edited by
Andrew Latham
Summary:
A real estate appraisal is a licensed appraiser’s independent assessment of a property’s fair market value, required by most mortgage lenders before approving a home purchase or refinance loan.
The appraiser uses several methods to arrive at a value, and the result directly affects how much a lender will finance.
- Sales comparison approach: The most common method, comparing the subject property to recently sold homes with similar features in the same market area.
- Cost approach: Estimates what it would cost to rebuild the property from scratch, minus depreciation, plus the land value.
- Income approach: Used primarily for rental and investment properties, based on the income the property can generate.
- Low appraisal: If the appraised value comes in below the purchase price, the lender will typically only finance up to the appraised value, requiring the buyer to renegotiate or cover the gap.
An appraisal can make or break a real estate transaction. Understanding what appraisers look for — and what happens when the number does not match expectations — prepares buyers, sellers, and homeowners for one of the most consequential steps in any real estate deal.
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How a real estate appraisal works
Once a buyer applies for a mortgage, the lender orders an appraisal from a state-licensed or state-certified appraiser. The appraiser visits the property to assess its condition, size, features, and location, then researches recent comparable sales to determine market value.
The final appraisal report is delivered to the lender, who uses it to confirm the loan amount is supported by the property’s value. Federal law gives the buyer the right to receive a copy of the appraisal at least three business days before closing.
The cost of a standard single-family home appraisal typically ranges from $300 to $500, according to the Appraisal Institute, though complex properties or rural locations can cost more. The buyer usually pays this fee at or before closing.
Appraisal methods
| Method | How It Works | Best For |
|---|---|---|
| Sales comparison | Compares subject property to recent sales of similar homes (comps) with adjustments for differences | Residential properties in active markets |
| Cost approach | Estimates land value plus the cost to rebuild improvements minus depreciation | New construction, unique properties with few comps |
| Income approach | Capitalizes the property’s net operating income to estimate value | Rental properties, commercial real estate |
Pro Tip
Before an appraiser visits, clean the home, complete any minor repairs, and prepare a list of recent upgrades with their costs: a new roof, HVAC system, kitchen renovation, or bathroom remodel. Appraisers cannot consider improvements they cannot see or document, and a well-maintained, clearly improved home typically supports a higher value than one that appears neglected regardless of the upgrades underneath.
What affects an appraisal value
Appraisers weigh a combination of property-specific and market factors when determining value.
- Comparable sales (comps): Recent sales of similar homes within roughly one mile, typically sold within the last six months, are the strongest evidence of market value.
- Property condition: Structural issues, deferred maintenance, outdated systems, and safety hazards can reduce value or require repairs before the loan can close.
- Square footage and layout: Gross living area is one of the most heavily weighted factors. Finished basement space, for example, is typically valued differently than above-grade space.
- Location: School district quality, proximity to amenities, noise exposure, and neighborhood trends all influence value.
- Upgrades and features: Kitchens, bathrooms, energy efficiency improvements, and curb appeal contribute positively, though rarely dollar-for-dollar relative to renovation costs.
According to the SuperMoney mortgage industry study, appraisal gaps, where the appraised value falls below the purchase price,are more common in fast-moving markets where sale prices are outpacing comparable data available to appraisers.
What happens if the appraisal comes in low
A low appraisal does not automatically kill a transaction, but it requires one of several responses from the buyer and seller.
- Renegotiate the price: The buyer can ask the seller to reduce the purchase price to match the appraised value, which is often the most straightforward solution.
- Pay the difference in cash: The buyer can cover the gap between the appraised value and the purchase price out of pocket, increasing the effective down payment.
- Request a reconsideration of value (ROV): If the buyer believes the appraiser overlooked relevant comparable sales, they can formally request a review with supporting data.
- Order a second appraisal: Some loan programs allow a second appraisal, though this option is subject to lender and program guidelines.
- Walk away: Most purchase contracts include an appraisal contingency that allows the buyer to exit the deal without penalty if the home does not appraise at or above the purchase price.
A low appraisal also affects private mortgage insurance requirements. Since PMI is triggered when the loan-to-value ratio exceeds 80%, a lower appraised value can raise that ratio and require PMI even when the buyer had planned to avoid it.
Appraisal vs. home inspection
An appraisal and a home inspection are both standard steps in a home purchase, but they serve different purposes for different parties.
| Feature | Appraisal | Home Inspection |
|---|---|---|
| Primary purpose | Determine fair market value | Identify defects and safety issues |
| Ordered by | Lender (buyer pays) | Buyer |
| Protects | Lender’s collateral | Buyer’s interests |
| Typical cost | $300–$500 | $300–$500 |
| Required for mortgage | Yes (for most loan types) | Not required, but strongly recommended |
Related reading on home buying
- Mortgage — covers how home loans are structured, underwritten, and approved, including how the appraised value determines the maximum loan amount.
- Home inspection — explains what a professional inspection covers and how defects found during inspection interact with the appraisal process.
- Home equity — describes how appraised value forms the basis of your equity calculation and affects access to home equity loans and refinancing options.
Frequently asked questions
Who pays for a home appraisal?
In a purchase transaction, the buyer typically pays the appraisal fee, which is usually collected upfront or at closing. The fee ranges from $300 to $500 for a standard single-family home, though complex properties, rural locations, and certain loan types like FHA or VA may cost more due to additional requirements.
How long does a home appraisal take?
The physical inspection of the property typically takes 30 minutes to a few hours depending on the property’s size and condition. The appraiser then researches comparable sales and completes the written report, which usually takes three to seven business days from the date of the visit to deliver to the lender.
Can I be present during the appraisal?
Yes, and it can be helpful. Being present gives you the opportunity to point out recent upgrades, provide documentation of improvements, and answer questions about the property. Appraisers are independent and will not inflate a value based on conversation, but providing factual information about the home ensures they have complete data to work with.
How is an appraisal different from a Zestimate or online valuation?
Automated valuation models (AVMs) like Zillow’s Zestimate use algorithms and public data to estimate value, but they cannot account for interior condition, recent renovations, or neighborhood nuances. A licensed appraisal involves a physical inspection and professional judgment, which is why lenders rely on appraisals rather than online estimates for underwriting decisions.
How long is an appraisal valid for a mortgage?
Most conventional loan appraisals are valid for 120 days from the inspection date, according to Fannie Mae guidelines. FHA appraisals are valid for 180 days. If the loan does not close before the appraisal expires, an extension or updated appraisal is required.
Key takeaways
- A real estate appraisal is an independent valuation of a property’s market value, required by most lenders before approving a home loan.
- The sales comparison approach is the most common method, comparing the property to recent sales of similar homes in the same area.
- Appraisal costs typically range from $300 to $500, paid by the buyer and valid for 120 days on most conventional loans.
- A low appraisal does not automatically end a deal — buyers and sellers can renegotiate, cover the gap in cash, or request a reconsideration of value.
- An appraisal protects the lender’s collateral; a home inspection protects the buyer — both are standard steps in a purchase transaction.
If you are buying or refinancing a home, compare mortgage lenders and rates at SuperMoney’s mortgage reviews.
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