The fastest way to check your home's value
You can get a rough estimate of your home's current value in minutes using free online tools. The most common ones are Zillow's Zestimate, Redfin's estimate, and your county assessor's website. These tools pull data from recent sales of similar homes in your area, property tax records, and home characteristics you enter yourself.
None of these estimates are official appraisals. They are starting points. A real appraisal—the kind a bank requires before lending money against your home—costs $300 to $500 and takes a week or two. But if you just want to know the ballpark figure, the free estimates get you there fast enough to make decisions about refinancing, selling, or understanding your net worth.
The estimates tend to be more accurate in neighborhoods where homes sell frequently and less accurate in rural areas or places where homes rarely change hands. If your neighborhood has sold three similar homes in the last six months, the estimate is probably within 5 to 10 percent of what yours would sell for. If the last comparable sale was two years ago, treat the number as a rough guess.
Key Takeaways
- Free online estimates from Zillow, Redfin, or your county assessor give you a starting point in minutes, though they are not official appraisals.
- The accuracy of an online estimate depends on how many similar homes have sold recently in your neighborhood—frequent sales mean more reliable numbers.
- Your county assessor's estimate is based on property tax records and is public information you can look up for free on the assessor's website.
- A professional appraisal costs $300 to $500 and is required by banks before they will lend against your home, but you do not need one just to know your home's value.
- Comparable sales data—what similar homes actually sold for—is more reliable than any algorithm, and you can find this information through your real estate agent or county records.
Where to find free estimates online
Zillow and Redfin both let you search your address and see an estimate instantly. Zillow calls theirs a Zestimate. Redfin calls theirs a home estimate. Both show you the estimate range—for example, $450,000 to $470,000—which tells you how confident the tool is in the number. A wide range means less confidence.
Your county assessor's office maintains a public database of property values used for tax purposes. You can usually search it free on the assessor's website by address or parcel number. The assessed value is not the same as market value—it is what the county thinks your home is worth for tax purposes, which is often lower than what it would sell for. But it is a real number based on actual records, not an algorithm.
Realtor.com also provides estimates, as do some mortgage lender websites. The estimates from different sites often disagree by 5 to 15 percent because they weight recent sales data differently and update at different times. If one site says $400,000 and another says $420,000, your actual value is probably somewhere in that range.
Why online estimates can be wrong
Online tools do not know the condition of your home. They know the square footage and age, but they do not know if your roof is new or failing, if your kitchen was updated last year or is original to 1985, or if you have foundation problems. A home in perfect condition can be worth 10 to 20 percent more than an identical home that needs work.
The tools also struggle when your home is unusual. If you have a finished basement that the tax records do not mention, or if you added a room that was never officially recorded, the estimate will be too low. If your neighborhood is changing—new development nearby, a new highway, a school closing—the algorithm may not have caught up yet.
Recent sales are the backbone of any estimate. If three homes just like yours sold in the last month for $425,000, $428,000, and $430,000, the estimate is probably accurate. If the last comparable sale was eighteen months ago, the estimate is a guess dressed up as a number.
How to find what similar homes actually sold for
Your county recorder's office keeps records of every property sale, including the sale price. You can search these records free on the county website, usually under "recorder" or "assessor." The records show the address, sale date, and sale price. This is public information.
A real estate agent can pull comparable sales data much faster than you can search county records yourself. If you are thinking about selling, a good agent will show you a list of homes similar to yours that sold in the last three to six months, with photos and sale prices. This is called a comparative market analysis, or CMA. Agents do this for free because they are hoping to list your home.
If you are not planning to sell, you can still call a local real estate agent and ask for a CMA. Many will do it for free or a small fee. The data they show you—actual sale prices of actual comparable homes—is more reliable than any online estimate because it is based on real transactions, not algorithms.
When you need a professional appraisal
A professional appraiser is a licensed person who inspects your home in person and writes a formal report of its value. Banks require an appraisal before they will lend money against your home, whether you are refinancing or taking out a home equity loan. The appraisal usually costs $300 to $500 and takes one to two weeks.
You do not need an appraisal just to know what your home is worth. You need one when a lender requires it. If you are refinancing, the lender orders the appraisal and you pay for it. If you are selling, the buyer's lender orders it. If you are taking out a home equity line of credit, the lender orders it.
An appraisal is more thorough than an online estimate because the appraiser sees the actual condition of the home, the lot, and the neighborhood. But appraisers also use comparable sales data, so their conclusion should not be wildly different from what you found online. If an appraisal comes back significantly lower than the online estimates, it usually means the appraiser found something wrong with the home that the online tools did not know about.
How home value changes and what affects it
Your home's value changes based on what similar homes are selling for in your area. If the neighborhood is hot and homes are selling fast, values go up. If the market is slow, values stay flat or drop. Interest rates, local job growth, school quality, and proximity to amenities all affect how much people will pay for homes like yours.
Improvements you make to your home—a new roof, updated kitchen, finished basement—can increase its value, but not dollar-for-dollar. A $20,000 kitchen renovation might add $15,000 to the home's value, not $20,000. The return depends on what is standard in your neighborhood and what buyers expect.
Major problems decrease value. A foundation crack, roof that needs replacement, or outdated electrical system can lower the price by thousands. Online estimates do not know about these problems, so if your home has significant issues, the estimate will be too high.
Understanding the difference between value and what you owe
Your home's current value and what you owe on your mortgage are two separate numbers. If your home is worth $400,000 and you owe $250,000, you have $150,000 in equity. If you owe $420,000 and the home is worth $400,000, you are underwater—you owe more than the home is worth.
Knowing your home's value matters if you are thinking about refinancing, taking out a home equity loan, or selling. It also matters for understanding your net worth and your financial position. But the value does not change what you owe. Your mortgage payment stays the same whether the home goes up or down in value.
Frequently Asked Questions
Is the Zillow estimate accurate?
Zillow's Zestimate is a starting point, not a may provide. It is usually within 5 to 10 percent of actual value in neighborhoods with frequent sales, but can be off by 20 percent or more in areas where homes rarely sell. Check the estimate range Zillow shows—a wide range means less confidence in the number.
Can I use an online estimate to refinance my home?
No. Lenders require a professional appraisal before they will refinance. You can use an online estimate to decide whether refinancing makes sense, but the lender will order their own appraisal, which costs $300 to $500 and takes one to two weeks.
How often should I check my home's value?
There is no set schedule. Check it when you are thinking about a major financial decision—refinancing, selling, taking out a home equity loan. If you are just curious about your net worth, checking once a year is plenty. Home values do not change week to week in most neighborhoods.
What if the online estimate seems way too high or too low?
Look at the comparable sales the tool shows you. If the homes it used as comparisons are not actually similar to yours—different size, different condition, different neighborhood—the estimate is probably off. Call a local real estate agent and ask for a comparative market analysis to see what similar homes actually sold for.
Do I need to pay for a home value estimate?
No. Zillow, Redfin, your county assessor, and real estate agents all provide estimates for free. Professional appraisals cost money, but you only need one when a lender requires it, not when you are just checking your home's value.