A home appraisal is an independent, professional opinion of a property's market value, prepared by a state-licensed or certified appraiser. When a buyer is financing a purchase, the lender almost always orders an appraisal to confirm that the home is worth at least the amount being borrowed. The appraisal protects the lender's collateral, but it also gives every party in the transaction an objective data point about value. Whether you are selling your home yourself or buying one, understanding how the appraisal works helps you prepare, avoid surprises, and keep your timeline on track.
This guide explains what an appraiser does, what happens on appraisal day, and what to do if the result is higher or lower than the contract price. It is educational only and is not legal, financial, tax, or appraisal advice. Any dollar figures or percentages below are illustrations to show how the process works, not pricing guidance for your specific property. For questions about your contract, contingencies, or closing, consult a real estate attorney or your title company.
What an Appraisal Is and Why Lenders Require One
An appraisal is a written report estimating a home's value based on its condition, features, location, and recent sales of comparable properties. It is distinct from a home inspection: an inspection evaluates the physical condition and systems of the house, while an appraisal focuses on value. The two serve different purposes, and most financed purchases involve both.
Lenders require an appraisal because the home serves as collateral for the mortgage. If the appraised value comes in below the purchase price, the lender will typically only finance against the lower figure. That is why the appraisal can directly affect how much a buyer needs to bring to closing, and why it matters to sellers and buyers alike.
How Appraisers Determine Value
For most single-family homes, appraisers rely heavily on the sales comparison approach: they identify recently sold properties similar to the subject home, usually nearby and sold within roughly the last several months, then adjust for differences such as square footage, lot size, number of bedrooms and bathrooms, garage, condition, and upgrades. These adjusted comparables, often called comps, anchor the appraiser's opinion of value.
Appraisers may also consider the cost approach (what it would cost to rebuild the home, minus depreciation, plus land value) and, for income or rental properties, the income approach (value based on the rent the property can generate). The appraiser is an independent third party; neither the buyer, the seller, nor a marketplace influences the conclusion.
What Happens on Appraisal Day
After a purchase contract is signed and the buyer's lender orders the appraisal, the appraiser schedules a visit, which often takes anywhere from about 20 minutes to an hour depending on the size and complexity of the home. The appraiser measures the home, photographs rooms and major features, and notes condition, layout, and any improvements. Some loan programs allow desktop or drive-by appraisals in certain situations, so the on-site visit is not always required.
After the visit, the appraiser completes research and analysis and delivers a written report to the lender, commonly within several days to a couple of weeks. The buyer is generally entitled to a copy of the report. Timelines vary by market conditions, appraiser availability, and loan type.
How to Prepare Your Home for the Appraiser
Sellers cannot and should not try to influence the appraiser's independent judgment, but a few neutral, factual steps can help the visit go smoothly. Make sure the home is accessible and that the appraiser can reach every room, the attic access, the mechanical systems, and the exterior. Address obvious deferred maintenance and complete any small repairs you have already planned, and ensure the home is clean and uncluttered so features are clearly visible.
It can be helpful to provide a simple, factual list of permitted improvements with approximate dates, such as a new roof, updated HVAC, a renovated kitchen, or an added bathroom, along with any documentation. Stick to verifiable facts; the appraiser independently verifies and weighs the information. Avoid any commentary that could be read as steering, and keep all communication focused strictly on the property's features and condition.
When the Appraisal Comes in High or Low
If the appraised value meets or exceeds the contract price, the valuation contingency is typically satisfied and the transaction proceeds on the agreed terms. A value higher than the purchase price does not change the price the buyer pays, but it may mean the buyer is purchasing with instant equity.
If the value comes in below the contract price (sometimes called an appraisal gap), the parties generally have several paths, depending on what their contract allows: the buyer may pay the difference in cash, the parties may renegotiate the price, the buyer may request a reconsideration of value if there is a factual error or a stronger comparable was overlooked, or, where a financing or appraisal contingency applies, a party may have the right to cancel. Because these outcomes are governed by the specific contract language and applicable state law, review your options with a real estate attorney or your title company before deciding how to proceed. As a neutral facilitator, ListMyHomes does not negotiate, advise on price or terms, or draft contract language on your behalf.
Appraisals for Rental and Investment Properties
If you are buying or refinancing a property you intend to rent, the appraiser may place more weight on the income approach, estimating value from the rent the property can reasonably command in its market. For these properties, the appraiser may complete an additional rent-schedule form summarizing market rents for comparable units. Local rent levels, vacancy, and operating expenses can all factor into the analysis.
Separate from valuation, landlords should remember that any tenant-screening decisions must rest on lawful, consistent, written criteria applied the same way to every applicant, with no selection or rejection based on race, color, religion, national origin, sex, familial status, disability, or any other class protected under federal, state, or local fair housing law. The appraisal speaks only to property value; it has nothing to do with who may rent the home.
ListMyHomes.com is a licensed brokerage that acts only as a neutral facilitator and does not provide legal, financial, tax, or appraisal advice. Figures are illustrations, not advice; consult a licensed professional for your specific situation.