The fastest way to estimate your home's value
The quickest estimate comes from online valuation tools that use public sales data from your area. Websites like Zillow, Redfin, and Realtor.com let you enter your address and get a number in seconds — these are called automated valuation models, or AVMs. They pull from recent comparable sales (homes similar to yours that sold nearby), property tax records, and listing data.
These estimates are free and usually within 5 to 10 percent of what a professional appraiser would say, though the margin of error grows if your home is unusual, sits on an odd lot, or your neighborhood has few recent sales. The tools update as new sales data comes in, so checking the same site a few months apart will show you whether the estimate is moving up or down.
Start with at least two different sites — Zillow and Redfin often disagree by thousands of dollars because they weight recent sales differently. If both give you a similar range, that range is probably close to reality. If they differ wildly, your home may be hard to compare, and you will need a more detailed approach.
Key Takeaways
- Online valuation tools like Zillow and Redfin give you a free estimate in minutes, though they are usually accurate only within 5 to 10 percent.
- A real estate agent's comparative market analysis (CMA) is free and based on actual sales in your neighborhood, making it more reliable than an online tool if you are thinking about selling.
- 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 dispute.
- Your home's assessed value for property taxes is almost always lower than its market value and should not be used as your estimate.
- Recent comparable sales within a quarter-mile of your home and sold in the last three to six months matter far more than list prices or homes that did not sell.
What a real estate agent's market analysis tells you
If you are thinking about selling or refinancing, ask a local real estate agent for a comparative market analysis (CMA). This is free — agents do it to win your business — and it is more detailed than an online tool because the agent physically knows the neighborhood and can explain why certain sales matter more than others.
A CMA lists homes that sold recently in your area, shows what they sold for versus their list price, and explains which ones are most like yours. An agent will note if a comparable home had a finished basement you do not have, or if it sold quickly because the market was hot, or if the buyer was desperate. These details matter because they explain why one sale is a better match than another.
You do not have to list your home with that agent to get a CMA — many agents will prepare one in hopes you will list later. Call three or four local agents and ask for their analysis. If they all cluster around the same number, that is a strong signal. If they vary widely, ask each agent why their estimate differs from the others.
When you need a professional appraisal
A professional appraisal is an official assessment by a licensed appraiser, usually required by a lender if you are refinancing your mortgage or by a buyer's lender if you are selling. It costs between $300 and $500 depending on your home's size and location. The appraiser inspects the interior and exterior, measures the structure, notes the condition, and compares it to recent sales.
You do not need an appraisal just to know your home's value — the online tools and agent analysis will tell you that. You need one if a lender requires it, if you are disputing your property tax assessment, or if you are settling an estate or divorce and need an official number for legal purposes.
If you are refinancing, your lender will order the appraisal and you will pay for it. If you are selling, the buyer's lender typically orders it. If you want an appraisal for your own records, you can hire one independently, but most people find the free methods sufficient.
Why your property tax assessment is not your home's value
Your county assessor assigns a value to your home each year for property tax purposes. This number is almost always lower than what your home would sell for on the open market, sometimes significantly lower. Assessors use different methods than real estate markets do, and they update values on different schedules — some counties reassess every year, others every three to five years.
You can find your assessed value on your property tax bill or your county assessor's website, but do not use it as your estimate of what your home is worth. It is useful only for understanding your tax burden. If you think your assessed value is too high, you can file an appeal with your assessor's office, but that is a separate process from determining market value.
How to read comparable sales in your neighborhood
Whether you are looking at an agent's CMA or doing your own research on Realtor.com or your county's property records, focus on homes that actually sold, not homes currently listed. A listing price is what the seller hopes to get; a sale price is what someone actually paid. Recent sales matter far more than old ones — typically look at homes sold in the last three to six months.
Prioritize sales within a quarter-mile of your home and in the same school district if possible. A home two miles away in a different neighborhood may have sold for more or less for reasons that do not apply to you. Note the condition of each comparable home — if a recent sale was a foreclosure or a distressed sale, it may have sold for less than market value and should be weighted less heavily.
If your home has unusual features — a pool, a finished basement, a garage conversion — look for comparables that have the same features. If you cannot find exact matches, note what features differ and try to estimate their value based on other sales. A real estate agent can help you do this; it is part of what they do in a CMA.
How market conditions affect your estimate
The same home can be worth different amounts depending on whether the market is moving fast or slow. In a seller's market, homes sell quickly and often above list price, which means recent sales prices are probably higher than they were six months ago. In a buyer's market, homes sit longer and may sell below list price, which means the trend is downward.
Check how long homes are staying on the market in your area — if comparable homes are selling in two weeks, the market is hot and prices are likely rising. If they are sitting for two months, prices may be softening. Real estate websites show "days on market" for recent sales, which tells you the pace.
If you are planning to sell soon, a recent sale is more relevant than an older one because it reflects current conditions. If you are just curious about your home's value for net worth purposes, a range based on sales from the last six months is reasonable.
What to do if you get very different estimates
If an online tool says your home is worth $400,000 and an agent says $350,000, the gap usually means one of three things: your home is hard to compare because it is unusual, the neighborhood has few recent sales so the data is thin, or one estimate is simply wrong.
Start by checking whether the online tool and the agent are looking at the same home — sometimes they miss additions or confuse square footage. Then look at the comparable sales each one used. If the agent's comparables are all from the last three months and the online tool is pulling from a wider time window, the agent's estimate is probably more current. If the agent's comparables are all from a different neighborhood, ask why.
If you still cannot reconcile the estimates, get a second agent's opinion or hire a professional appraisal. The cost of an appraisal is worth it if the difference between estimates affects a major financial decision like refinancing or selling.
Frequently Asked Questions
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. If you are planning to sell or refinance within the next few months, check every month or two to watch the trend. Online estimates update as new sales data comes in, usually within a few weeks of a sale closing.
Is Zillow's Zestimate accurate?
Zillow's estimate is usually within 5 to 10 percent of actual value, but it can be off by much more if your home is unusual or your neighborhood has few recent sales. Compare it to Redfin and at least one agent's estimate before relying on it for a major decision.
Can I use my home's value to borrow money?
Yes, if you own your home outright or have equity in it, you can borrow against that value through a home equity line of credit or a cash-out refinance. A lender will order a professional appraisal before approving the loan, so your estimate is just a starting point.
What if my home has not sold recently in my neighborhood?
Expand your search to a wider area and look for homes with similar size, age, and condition. A home a half-mile away is still relevant if it is comparable. If your neighborhood has almost no recent sales, an agent's opinion becomes more valuable because they know the local market in ways data cannot capture.
Does my home's value affect my property taxes?
Your assessed value for property taxes is set by your county assessor and is usually lower than market value. Market value does not directly change your taxes, but if you think your assessed value is too high, you can appeal it to your assessor's office.