The three ways to find your home's market value

Market value is what a buyer would pay for your home right now, in a normal sale. You can find it by looking at what similar homes sold for recently in your area, by getting a professional appraisal, or by using an online estimate tool. Each method gives you a different level of detail and costs different amounts of money or time.

The most reliable approach combines all three: check what comparable homes sold for, then verify that picture with an appraisal if you need a number for a bank or court. Online tools are fast and free but less precise, especially if your home is unusual or your neighborhood is changing quickly.

Key Takeaways

  • Comparable sales (homes similar to yours that sold in the last 90 days) give you the most realistic picture of what buyers will actually pay.
  • A professional appraisal costs $300 to $500 but is required by lenders and holds up in court or tax disputes.
  • Online estimate tools like Zillow or Redfin are free and instant but can be off by 5 to 20 percent, especially in rural areas or fast-changing neighborhoods.
  • Your county assessor's value is for tax purposes only and is usually lower than market value.
  • The most accurate number comes from looking at three to five homes that sold within the last three months, in the same neighborhood, with similar size and condition.

Finding comparable sales on your own

A comparable sale (or "comp") is a home like yours that sold recently nearby. You can search for these yourself using public records, which are free and available online through your county assessor's website or through sites like Zillow, Redfin, or Realtor.com.

Start by searching for homes in your neighborhood that sold in the last 90 days. Look for homes with the same number of bedrooms and bathrooms, similar square footage, and similar condition. If your home has a garage, a recent renovation, or sits on a larger lot, note which comps match those features and which don't. A home that sold three months ago two blocks away is more useful than one that sold a year ago across town.

Write down the sale price for each comp, then look at the price per square foot. If a 2,000-square-foot home sold for $400,000, that's $200 per square foot. If your home is 2,200 square feet, multiply $200 by 2,200 to get a rough estimate of $440,000. This math is not exact—condition, lot size, and location matter—but it gives you a starting point. Average the prices of your three to five best comps to get a range rather than a single number.

Getting a professional appraisal

An appraisal is a formal written estimate by a licensed appraiser who inspects your home in person. It costs $300 to $500 depending on your home's size and location, and it takes one to two weeks. Banks require an appraisal before they lend money on a home, and courts accept appraisals as evidence in property disputes or tax appeals.

To order an appraisal, contact a local appraisal company or ask your bank or real estate agent for a referral. The appraiser will visit your home, measure rooms, check the roof and foundation, and compare your home to recent sales. They will produce a written report with a single value and an explanation of how they arrived at it. This report is yours to keep and can be used for refinancing, insurance, estate planning, or tax purposes.

An appraisal is more expensive and slower than an online tool, but it is the only method that lenders and courts will accept without question. If you are refinancing, disputing your property tax assessment, or settling an estate, an appraisal is worth the cost.

Using online estimate tools

Websites like Zillow (Zestimate), Redfin, and Realtor.com offer free instant estimates based on public records, recent sales, and their own algorithms. These tools are fast and require no phone calls or appointments. You can check them anytime to see how your home's estimated value has moved.

The trade-off is accuracy. Online estimates can be off by 5 to 20 percent, and sometimes more. They work better in neighborhoods where homes are similar and sell frequently, and worse in rural areas, in neighborhoods with few recent sales, or if your home is unusual (a historic house, a property with acreage, a home with major recent renovations). The algorithm does not know about a new roof you paid for last year or a foundation crack you had repaired.

Use online tools as a starting point, not as your final answer. They are useful for tracking trends over time and for getting a rough sense of value before you do deeper research. If you need a number for a serious decision—refinancing, selling, or a legal matter—do not rely on an online estimate alone.

Understanding your county assessor's value

Your county assessor assigns a value to your home for property tax purposes. This value is public record and you can find it on your county assessor's website by searching your address. It is usually lower than market value because assessors use different methods and update values less frequently than the market changes.

The assessor's value is useful for understanding your property tax bill, but it is not the same as what your home would sell for. Do not use it as your market value estimate. If you believe your assessment is wrong, most counties allow you to file a formal appeal, usually once per year. An appraisal can support an appeal if you think your assessment is too high.

What affects how accurate your estimate will be

Your estimate will be more reliable if your home is in a neighborhood where homes sell frequently, where homes are similar to each other, and where recent sales data is available. It will be less reliable if your home is unusual, if your neighborhood is changing rapidly, or if few homes have sold recently.

Homes in urban and suburban areas with active markets usually have plenty of recent comps and accurate online estimates. Homes in rural areas, historic homes, homes on large properties, and homes with unusual features (a pool, a guest house, a commercial space) are harder to value because fewer similar homes have sold recently. In these cases, a professional appraisal is worth the cost because the appraiser can explain how they adjusted for differences.

If your home has had a major recent change—a new roof, a kitchen renovation, an addition, or significant damage and repair—your estimate may not reflect that yet. Online tools update slowly, and comps from before the change may not be relevant. Tell an appraiser about recent work so they can account for it.

Putting your estimates together

The strongest approach is to gather three pieces of information: comparable sales from the last 90 days, an online estimate from at least two sources, and (if you need a number for a serious decision) a professional appraisal. If all three point in the same direction, you have a reliable number. If they disagree, the appraisal is the most defensible in a legal or financial context.

Write down your comps, your online estimates, and your appraisal value (if you have one) and look at the range. If comps suggest $350,000 to $370,000, an online tool says $365,000, and an appraisal says $360,000, you can be confident your home is worth roughly $360,000. If the online tool says $400,000 and the comps say $350,000, dig deeper—the online estimate may be using outdated data or the neighborhood may be changing faster than recent sales show.

Frequently Asked Questions

How often should I check my home's value?

If you are tracking your home for personal interest, checking once or twice a year is enough. If you are planning to refinance or sell, check every few months to see the trend. Online tools update monthly or quarterly, but market value can shift based on interest rates, neighborhood changes, and local economic conditions.

Can I use my home's value for a tax deduction?

No. Your home's market value does not affect your income taxes. Your property tax assessment (set by your county) is what determines your property tax bill. If you think your assessment is too high, you can appeal it, and an appraisal can support that appeal.

What if I just inherited a home and need to know its value?

Get a professional appraisal. Estates and trusts often require a formal valuation for tax and legal purposes, and an appraisal is the standard document for this. The cost is usually paid from the estate, and the appraisal becomes part of the official record.

Why do different websites give me different estimates?

Each website uses different data sources, algorithms, and update schedules. Zillow may weight recent sales differently than Redfin, or one site may have newer data than the other. This is why checking two or three sources and comparing them to actual comps gives you a better picture than trusting one tool alone.

Is my home worth more if I make improvements?

Usually, but not always. A new roof, updated kitchen, or fresh paint typically add value, but you may not recover the full cost. A professional appraisal done after improvements can show whether the work increased your home's value and by how much. Online estimates may not reflect recent work for several months.