The fastest way to find your property value

The quickest estimate comes from Zillow, Redfin, or Realtor.com. Go to any of these sites, enter your address, and you get a number in seconds. These estimates pull from public records—your county assessor's data, recent sales nearby, property details—and spit out what they think your home is worth today. The number is called a Zestimate (Zillow), Redfin Estimate, or Home Value Estimate depending on the site.

These online estimates are free and useful for a rough sense of direction. They are not official. They can be off by 5 to 20 percent or more, especially in rural areas or neighborhoods where homes don't sell often. But they give you a starting point in under a minute.

If you need a number for a specific reason—refinancing, a home equity loan, property tax appeal—you will need something more official than a website estimate. The method changes depending on why you need the value.

Key Takeaways

  • Online estimates from Zillow, Redfin, or Realtor.com are free and instant but can be off by 5 to 20 percent.
  • Your county assessor's office publishes property values for tax purposes, which you can look up online or in person for free.
  • A professional appraisal costs $300 to $500 and is required by lenders but is the most accurate method available.
  • Comparable sales data from a real estate agent shows what similar homes sold for recently in your neighborhood.
  • The reason you need the value—refinancing, insurance, taxes, or selling—determines which method is appropriate.

Check your county assessor's official value

Your county assessor publishes a property value every year for tax purposes. This is public record and free to look up. Go to your county assessor's website (search "[your county] assessor property search"), enter your address, and you will see the assessed value. This is what the county says your home is worth for property tax calculations.

The assessed value is often lower than the market value—what a buyer would actually pay. Counties use different formulas and update assessments on different schedules, so the number may lag behind real prices. But it is official, it is free, and it is a solid reference point.

If you think the assessed value is wrong—too high, which raises your taxes—you can challenge it. The process is called a property tax appeal or assessment appeal. Deadlines and procedures vary by county, so check your assessor's website for the specific steps and dates in your area.

Get a professional appraisal for lending or legal purposes

If you are refinancing a mortgage, taking out a home equity loan, or need an official value for a legal matter, your lender or attorney will require a professional appraisal. An appraiser is a licensed professional who inspects your home, compares it to recent sales of similar homes nearby, and produces a written report with a value estimate.

An appraisal typically costs $300 to $500 and takes one to two weeks. If you are refinancing, the lender usually orders and pays for it. If you are getting a home equity loan, the lender pays. If you need one for a personal reason—divorce settlement, estate planning, property tax appeal—you hire and pay the appraiser yourself.

The appraisal is the most accurate method available because it is based on a physical inspection and recent comparable sales in your specific area. It is also the only method lenders will accept for a mortgage or loan decision.

Use comparable sales data from a real estate agent

A real estate agent can pull a comparative market analysis (CMA), which shows what homes similar to yours sold for in the last 90 days or 6 months in your neighborhood. This is free if you are considering selling and talking to an agent. The CMA is based on actual sales, not estimates, so it reflects real market conditions.

The agent looks at homes that are similar in size, condition, age, and location, then adjusts for differences. If your home has an extra bathroom or a newer roof, the agent factors that in. The result is a range—"homes like yours are selling for $280,000 to $310,000"—rather than a single number.

A CMA is useful if you are thinking about selling or refinancing, because it shows what buyers are actually paying right now. It is not official and not accepted by lenders in place of an appraisal, but it is grounded in real transactions.

Understand why the method matters

Different reasons for needing your property value call for different approaches. If you are curious about your net worth or wondering what your neighborhood looks like, an online estimate is fine. If you are refinancing or getting a loan, your lender will order an appraisal and you have no choice. If you are selling, a CMA from an agent tells you what to list for. If you are appealing your property taxes, the assessor's value is what you are fighting, and you may need an appraisal to prove it is wrong.

The value also changes depending on the market. In a hot market, homes sell fast and prices rise; estimates and CMAs will be more current. In a slow market, homes sit longer and prices may fall; older sales data becomes less useful. Check the date on whatever estimate you are using and remember that it is a snapshot, not a permanent number.

What to do if estimates disagree

It is normal for Zillow, Redfin, and your county assessor to show different numbers. They use different data, different formulas, and update at different times. A Zillow estimate might say $320,000 while your assessor says $280,000. Both can be right in their own context—one is a market estimate, the other is a tax value.

If the estimates are wildly different—more than 20 percent apart—look at the details. Check the property information on each site: does it list the right square footage, lot size, number of bedrooms? Errors in the underlying data throw off the estimate. If the information is wrong, you can usually correct it on Zillow and Redfin, and the estimate will recalculate.

If the information is correct but estimates still disagree, the difference usually reflects how recent the data is or how the algorithm weights comparable sales. In that case, a professional appraisal is the only way to settle it.

Frequently Asked Questions

Is the Zillow estimate accurate?

Zillow estimates are useful for a rough idea but can be off by 5 to 20 percent or more. They are based on public records and recent sales, but they do not account for your home's specific condition or unique features. Use it as a starting point, not a final answer.

Do I need an appraisal to sell my home?

No. You need a comparative market analysis from a real estate agent to decide what price to list for. An appraisal is only required if you are getting a mortgage or loan. Buyers' lenders will order their own appraisal as part of the loan process.

Can I challenge my property tax assessment?

Yes. If you think your assessed value is too high, you can file an appeal with your county assessor. The deadline and process vary by county, so check your assessor's website for the specific steps and dates. You may need an appraisal to support your case.

What if my home is unique or in a rural area?

Online estimates are less reliable for unique homes or rural properties because there are fewer comparable sales to draw from. A professional appraisal is more accurate in these cases because the appraiser can adjust for unique features and travel to see the property in person.

How often should I check my property value?

If you are not buying, selling, or refinancing, checking once a year is enough. If the market is moving fast in your area, you can check every few months. Remember that online estimates update slowly and may lag behind actual market conditions by weeks or months.