The fastest way to estimate your home's value

You can get a rough estimate of your home's value in minutes using free online tools like Zillow, Redfin, or Realtor.com. These sites use public records, recent sales of similar homes in your area, and automated valuation models to generate what's called a Zestimate (Zillow's term) or similar estimate. The estimate appears instantly when you enter your address.

These automated estimates are useful for a quick sense of direction, but they are often off by 5 to 20 percent or more, especially if your home has unusual features, recent renovations, or sits in a neighborhood where comparable sales are sparse. They work best in hot markets with lots of recent transactions and worst in rural areas or when your home differs significantly from others nearby.

If you need a number for a specific purpose — refinancing, a home equity line of credit, property tax appeals, or insurance — you will need something more reliable than an online estimate.

Key Takeaways

  • Free online estimates from Zillow, Redfin, or Realtor.com give you a starting point in minutes but can be off by 5 to 20 percent or more.
  • A comparative market analysis (CMA) from a real estate agent is free and uses actual recent sales of homes like yours, making it more accurate than automated estimates.
  • A professional appraisal costs $300 to $500 and is the most accurate option, required by lenders and useful for refinancing, appeals, or insurance claims.
  • Tax assessments and county records are public and free but often lag years behind actual market value.
  • Your purpose matters: a quick estimate works for curiosity, but refinancing or appeals require an appraisal or CMA.

Getting a free comparative market analysis from a real estate agent

A comparative market analysis (CMA) is a report a real estate agent prepares by looking at homes similar to yours that sold recently in your area. The agent pulls actual sale prices from the multiple listing service (MLS), adjusts for differences in size, condition, and features, and gives you a range of what your home is likely worth. This is free — agents do it hoping you will list with them later.

A CMA is more reliable than an online estimate because it is based on real transactions, not algorithms. The agent also knows the neighborhood, recent market shifts, and which comparable sales are truly similar to your home. You can contact two or three agents and ask each for a CMA; you are not obligated to list with any of them.

The downside is that the agent's estimate is not official or binding. If you need a number for a legal purpose — a property tax appeal, a divorce settlement, or a mortgage refinance — the lender or court will not accept a CMA alone.

Ordering a professional appraisal

A professional appraisal is an official estimate prepared by a licensed appraiser who inspects your home in person, measures it, photographs it, and compares it to recent sales. Appraisers follow federal standards (the Uniform Standards of Professional Appraisal Practice, or USPAP) and are regulated by the state. An appraisal typically costs $300 to $500, depending on your home's size and location.

You can order an appraisal directly from an appraisal company or appraiser in your area. Search online for "home appraisers near me" or ask your bank or mortgage lender for a referral. If you are refinancing, the lender will order the appraisal for you and add the cost to your loan or closing costs.

An appraisal is the most accurate and defensible number you can get. It is required by lenders, accepted by courts, and useful for property tax appeals, insurance claims, and estate planning. The downside is the cost and the time — appraisals usually take one to two weeks.

Checking your county tax assessment

Your county assessor's office maintains a public record of your home's assessed value, which is used to calculate property taxes. You can find this information free by visiting your county assessor's website or calling the office directly. Search online for "[your county] assessor" or "[your county] property appraiser."

The assessed value is usually lower than market value because assessors use a different standard — they estimate what the home would sell for in an arm's-length transaction, but they do not always update assessments every year. In some states, assessments lag three to five years behind actual market conditions. The assessed value is useful as a data point but should not be your only source.

If you believe your assessment is too high, you can file an appeal with your county assessor. The process and deadline vary by state, but you typically have 30 to 60 days after receiving your assessment notice. Bring a CMA or appraisal as evidence.

Using public records and recent sales data

County records are public and free. You can visit your county clerk's or recorder's office in person or online to search deed records, which show what other homes in your area sold for. Sites like County Records Online, your state's property appraiser website, or even Google Maps can help you find comparable sales.

This method requires more work than using Zillow, but it gives you direct access to actual transaction prices without an algorithm in between. Look for homes that sold in the last three to six months, are similar in size and condition to yours, and are in the same neighborhood or a very similar one. Adjust the price up or down based on differences — a home with an extra bedroom or a recent roof replacement should be worth more.

This approach works well if you are curious or doing research, but it is time-consuming and requires judgment about which sales are truly comparable. For a formal purpose, a CMA or appraisal is faster and more defensible.

Deciding which method fits your purpose

Your reason for finding your home's value determines which method makes sense. If you are curious about your home's worth or tracking it over time, a free online estimate is fine. If you are considering selling, a CMA from a real estate agent is the right next step. If you are refinancing, your lender will order an appraisal for you.

If you are appealing your property tax assessment, you will need either a CMA or an appraisal as evidence — the assessor will not accept an online estimate. If you are settling a divorce or estate, a professional appraisal is the standard. If you are buying additional insurance or updating your will, an online estimate or CMA is usually sufficient.

The more formal the purpose, the more formal the valuation method needs to be. Start with what is free and move to paid options only if you need something official.

Frequently Asked Questions

How often should I check my home's value?

If you are tracking it for curiosity, checking once or twice a year is enough. Online estimates change as new sales data comes in, so checking more often will just show you noise. If you are planning to refinance or sell, check quarterly or when you see significant market movement in your area.

Why is my Zillow estimate so different from what an agent told me?

Zillow's algorithm does not know about recent renovations, your home's condition, or neighborhood details an agent would catch. The agent's CMA is based on actual comparable sales and human judgment, so it is usually more accurate. If the two numbers are far apart, a professional appraisal will settle it.

Can I use an online estimate to refinance my home?

No. Lenders require a professional appraisal ordered through them. They will not accept an online estimate, a CMA, or a tax assessment. If you are refinancing, your lender will handle ordering the appraisal and will charge you for it.

What if I disagree with my appraisal?

You can ask the appraiser to review their work if you think there is a factual error — a room they missed, a recent renovation they did not account for, or a comparable sale they overlooked. If you still disagree, you can order a second appraisal, though that costs another $300 to $500. For a tax appeal, you can hire your own appraiser as evidence.

Is my home's assessed value the same as its market value?

No. Assessed value is what the county uses for property taxes and is often lower and slower to change than market value. Market value is what your home would sell for today. They can differ by 10 to 30 percent or more, especially in fast-moving markets.