The three main ways to find your home's value

You can find your home's value through a property tax assessment, an online estimate tool, or by hiring a professional appraiser. Each method costs different amounts and gives you different levels of detail. The method you choose depends on why you need the number — whether you're refinancing a mortgage, selling, contesting your property taxes, or just curious.

None of these methods will give you a perfect answer. Home values change constantly based on recent sales nearby, the condition of your specific house, and what buyers in your area are willing to pay right now. But each method gets you close enough for most purposes.

Key Takeaways

  • Your county assessor's office publishes a property tax assessment for free, though it is often lower than market value and updates only once a year or less.
  • Online estimate tools like Zillow, Redfin, and Realtor.com are free and update frequently, but they use algorithms and may be off by thousands of dollars in either direction.
  • A professional appraiser costs $300 to $500 and gives the most accurate estimate, but you only need one if you are refinancing or selling.
  • Recent sales prices of similar homes in your neighborhood are the most reliable clue to what your home is actually worth right now.
  • Your home's condition, lot size, and local market conditions matter more than the estimate tool you use.

Getting your county assessor's value for free

Every county in the United States maintains a property tax assessment for your home. This is the value the county uses to calculate your property taxes. You can find it by searching your county assessor's website — search "[your county name] assessor" and look for a property search tool or tax records database.

The assessor's value is free and public record, but it is usually lower than what your home would actually sell for. Assessments are designed to be conservative, and they update only once a year or sometimes less often. In some counties, assessments lag behind market changes by several years. However, the assessor's value is useful if you are contesting your property taxes or need a baseline number quickly.

When you find your property record, you will see the assessed value, the lot size, the year built, the number of bedrooms and bathrooms, and sometimes notes about recent renovations. Write down the assessed value and the assessment date — that date tells you how current the number is.

Using free online estimate tools

Websites like Zillow, Redfin, Realtor.com, and Trulia publish estimated home values called "Zestimates" (Zillow), "Redfin Estimates," or similar names. These are free, they update frequently, and you can find them by typing your address into the search box. The estimates are based on algorithms that look at recent sales nearby, your home's characteristics, and market trends.

These tools are convenient, but they are often wrong — sometimes by $50,000 or more. The algorithm does not know if your roof is new or failing, if you have updated the kitchen, or if your neighborhood has a noise problem. The estimate is most accurate in hot markets where homes sell frequently and least accurate in rural areas or neighborhoods where sales are rare.

Use these tools to get a rough sense of your home's range, not as a final answer. If three different tools show your home between $350,000 and $380,000, you know the real value is probably somewhere in that band. If one tool says $300,000 and another says $450,000, the estimates are too far apart to be useful without more information.

Hiring a professional appraiser

A professional appraiser is a licensed person who inspects your home and writes a detailed report on its value. Appraisers cost between $300 and $500, depending on your home's size and your location. You need an appraisal if you are refinancing your mortgage or if you are selling and want to know your home's value before listing it.

An appraiser will visit your home, measure the rooms, check the condition of the roof and foundation, note any recent upgrades, and compare your home to similar homes that sold recently in your area. The appraisal report includes photographs, a description of the property, and a detailed explanation of how the appraiser arrived at the value. This report is much more reliable than an online estimate because it is based on a physical inspection and recent comparable sales.

If you are refinancing, your lender will order the appraisal and send you a copy. If you are selling, you can hire an appraiser yourself, though many sellers skip this step and rely on their real estate agent's estimate instead. If you are contesting your property tax assessment, you can hire an appraiser to support your case, though the county may have its own appraisers you can request.

Looking at recent sales in your neighborhood

The most reliable way to understand your home's value is to look at what similar homes actually sold for recently. Search your county assessor's website or a real estate site like Realtor.com or Zillow for homes in your neighborhood that sold in the last three to six months. Look for homes with the same number of bedrooms and bathrooms, similar lot size, and similar condition.

Write down the sale prices and the sale dates. If three homes like yours sold for $380,000, $385,000, and $378,000 in the last two months, your home is probably worth around $380,000. If the most recent sale was six months ago and prices have been rising, add a small amount to account for market movement. If you see a home that sold for much less, look at the details — it may have sold in foreclosure, needed major repairs, or had other unusual circumstances.

This method requires more work than using an online tool, but it is more accurate because you are looking at real transactions, not algorithms. Real estate agents have access to a database called the Multiple Listing Service (MLS) that shows all recent sales in your area, so if you are working with an agent, ask them to pull comparable sales for you.

Why your home's condition matters more than the estimate

All three methods — assessor value, online estimates, and appraisals — start with the assumption that your home is in average condition for its age and neighborhood. If your home is in better condition than average, its value is higher. If it needs major repairs, its value is lower. The online tools cannot see inside your home, so they cannot account for this.

If your roof is 20 years old and needs replacement soon, that reduces your home's value by $10,000 to $20,000, depending on your area. If you recently updated the kitchen or bathrooms, that adds value. If the foundation has cracks or the electrical system is outdated, that reduces value. When you compare your home to recent sales, look at the condition of those homes too — a home in excellent condition will have sold for more than a home needing work, even if they are otherwise identical.

What to do if you get very different numbers

If your county assessor says your home is worth $300,000, Zillow says $380,000, and a real estate agent says $360,000, the numbers are too far apart to ignore. Start by checking whether the assessor's value is current — if it was last updated five years ago, it is probably outdated. Then look at recent sales again and make sure you are comparing homes that are truly similar to yours.

If the online estimates are still very different from the recent sales you found, the algorithm may not be working well in your area. This happens in rural neighborhoods, in neighborhoods with few recent sales, or in areas where home values are changing very quickly. In these cases, rely more on the recent sales data and less on the online tools. If you are selling or refinancing, hire an appraiser — the cost is worth it when the estimates are this far apart.

Frequently Asked Questions

Do I need to pay to find out my home's value?

No. Your county assessor's value is free, and online estimate tools are free. You only pay if you hire a professional appraiser, which costs $300 to $500. You do not need an appraisal unless you are refinancing or selling.

How often do home values change?

Home values can change monthly or even weekly in hot markets, but the changes are usually small. Your county assessor updates values once a year or less often. Online tools update their estimates frequently, sometimes weekly. The real value of your home changes whenever a similar home sells nearby.

Can I use my property tax assessment as my home's value?

You can use it as a starting point, but it is usually lower than market value. Assessments are designed to be conservative and update slowly. If you need an accurate value for selling or refinancing, use recent sales data or hire an appraiser instead.

What if I think my property tax assessment is too high?

You can contest it by filing a formal challenge with your county assessor's office. The process and deadline vary by state, so search "[your state name] property tax appeal" to find your state's rules. You may need to hire an appraiser to support your case.

Should I trust online estimate tools like Zillow?

Use them as a rough guide, not as a final answer. They are convenient and free, but they are based on algorithms that cannot see your home's actual condition. They are most accurate in neighborhoods with frequent sales and least accurate in rural areas or neighborhoods where homes rarely sell.