The fastest way to find your home's current value
You can get a rough estimate of your home's value in minutes using free online tools, but the number will be less accurate than what a real estate agent or appraiser would tell you. The most common free tools are Zillow's Zestimate, Redfin's estimate, and Realtor.com's home value tool. Each pulls data from recent sales of similar homes in your area, property tax records, and home characteristics you enter yourself.
These estimates typically have a margin of error of 5 to 20 percent, depending on how recently homes near you sold and how much information is publicly available about your property. If your neighborhood has sold many homes in the past few months, the estimate will be closer. If the last comparable sale was years ago, treat the number as a starting point, not a final answer.
For a more accurate picture without paying for an appraisal, contact two or three local real estate agents and ask for a comparative market analysis (CMA). Agents prepare these free of charge because they hope to list your home. A CMA looks at actual recent sales of homes similar to yours — same size, condition, location — and adjusts for differences. This usually takes a few days because agents need to schedule a walkthrough.
Key Takeaways
- Free online tools like Zillow and Redfin give you a ballpark figure in minutes, but they are typically off by 5 to 20 percent.
- A comparative market analysis from a real estate agent is free and more accurate than online estimates because it uses actual recent sales in your area.
- A professional appraisal costs $300 to $500 and is the most accurate method, but you only need one if you are refinancing, selling, or settling a legal dispute.
- Your home's assessed value for property taxes is usually much lower than its market value and should not be used to estimate what you could sell it for.
When you need a professional appraisal instead of an estimate
If you are refinancing your mortgage, your lender will order an appraisal whether you want one or not. The appraiser is hired by the lender, not by you, and the cost (typically $300 to $500) is added to your loan or closing costs. The appraisal protects the lender by confirming the home is worth at least what you are borrowing against it.
You should also get a professional appraisal if you are selling your home and the agent's estimate seems far off from what you expected, or if you are involved in a divorce, estate settlement, or property tax dispute. In those cases, you hire the appraiser directly and pay upfront. The appraisal takes one to two weeks because the appraiser inspects the home in detail, reviews comparable sales, and writes a formal report.
Why your property tax assessment is not the same as your home's value
Your county assessor determines your home's assessed value for property tax purposes, and this number is almost always much lower than what your home would sell for on the open market. Assessed values are updated on a schedule set by your state — some counties reassess every year, others every three to five years — and they lag behind actual market changes.
You can find your assessed value on your property tax bill or on your county assessor's website by searching your address. It is useful for understanding your property tax bill, but it should not be used to estimate your home's market value. If you believe your assessment is wrong, most counties allow you to file a formal challenge, but that process is separate from finding out what your home is worth on the market.
How recent sales in your neighborhood affect the estimate
The more homes that have sold near you in the past three to six months, the more confident any estimate will be. When comparable sales are fresh and plentiful, online tools and agent analyses are usually within 5 to 10 percent of actual value. When the last similar sale was a year or more ago, or when your home is unusual (a custom design, on a large lot, in a rural area), estimates become much less reliable.
You can see recent sales yourself by searching your county's property records or using sites like Zillow and Redfin. Look for homes that sold in the past six months, are similar in size and condition to yours, and are in the same neighborhood or within a mile. Note the sale price and the date. If you find several sales within 10 percent of each other, that range is a reasonable estimate of your home's current value.
What to do if online estimates seem wildly different from each other
Zillow, Redfin, and Realtor.com sometimes disagree by tens of thousands of dollars, especially in neighborhoods where homes do not sell often or where properties vary widely in condition and features. When estimates differ by more than 10 percent, it usually means the algorithm does not have enough recent sales data to work with, or the home characteristics you entered (or that the site guessed) are wrong.
Start by checking that the information each site has about your home is accurate. Log into your Zillow account and edit your home's details — square footage, number of bedrooms, year built, recent renovations. Redfin and Realtor.com have similar edit options. Correcting obvious errors often brings estimates closer together. If they still disagree significantly after that, a free comparative market analysis from a local agent is your next step.
How to use your home's value for financial decisions
Your home's estimated value matters for refinancing (lenders want to know the loan-to-value ratio), for a home equity line of credit (the lender will order an appraisal), and for understanding your net worth. It also affects your property tax bill in some states, though the relationship is indirect and delayed.
Do not use an online estimate to decide whether to sell, to calculate how much you can borrow against your home, or to make major financial decisions. Use it as a starting point for conversation with an agent or lender. If the decision is important — refinancing, a large home equity loan, or selling — get a professional appraisal or a detailed comparative market analysis. The cost is small compared to the money at stake.
Frequently Asked Questions
Is Zillow's Zestimate accurate?
Zillow's estimate is usually within 5 to 20 percent of actual value, depending on how much recent sales data exists in your area. It is a useful starting point but not a substitute for an appraisal or agent analysis, especially if your home is unusual or your neighborhood does not have many recent sales.
Can I use my home's value to get a loan?
Yes, but the lender will order their own appraisal before approving a home equity loan or line of credit. They will not accept an online estimate. The appraisal costs $300 to $500 and is usually paid by you upfront or added to the loan.
How often should I check my home's value?
Checking once or twice a year is reasonable if you are curious about your net worth. Checking more often is unnecessary because home values change slowly in most markets. Major changes in your neighborhood — new development, school closures, crime — can shift value faster, but weekly or monthly checks will not show meaningful differences.
What if I think my property tax assessment is too high?
Contact your county assessor's office and ask about the appeal process. Most counties allow you to challenge your assessment if you believe it is wrong. You may need to provide evidence like a recent appraisal or comparable sales. The deadline to appeal varies by state, so check your county's website for the schedule.
Do I need an appraisal to sell my house?
No. You need a real estate agent's comparative market analysis to price your home for sale, and the buyer's lender will order an appraisal as part of their mortgage process. You do not pay for that appraisal. You only pay for your own appraisal if you want one for your own information.