The three ways to estimate your home's value
You can find your home's value through a professional appraisal, an automated online estimate, or a comparative market analysis from a real estate agent. Each method costs different amounts, takes different time, and gives you different levels of detail. Which one you need depends on why you're asking — whether you're refinancing a mortgage, selling, paying property taxes, or just curious.
A professional appraisal is the most formal and expensive option. An appraiser licensed by your state visits your home, measures it, photographs it, and compares it to similar homes that sold recently in your area. This takes one to two weeks and costs between $300 and $700. Lenders require an appraisal before they'll refinance your mortgage or give you a home equity loan. If you're selling, your buyer's lender will order an appraisal, but you don't pay for it.
Online estimates are free and instant. Websites like Zillow, Redfin, and Realtor.com use public records, recent sales, and algorithms to guess your home's value. These estimates are often called "Zestimates" (Zillow's term) or "automated valuation models" (AVMs). They're useful for a rough idea but can be off by 5 to 20 percent, especially in rural areas or if your home has unusual features.
A comparative market analysis (CMA) comes from a real estate agent and is free if you're considering selling. The agent pulls recent sales of homes similar to yours in your neighborhood and adjusts for differences. This is more detailed than an online estimate but less formal than an appraisal. Agents use CMAs to price homes for sale.
Key Takeaways
- Professional appraisals are required by lenders and cost $300 to $700, but online estimates are free and available instantly.
- Online estimates can be off by 5 to 20 percent, so use them as a starting point rather than a final number.
- Real estate agents provide free comparative market analyses if you're thinking about selling, and these are more accurate than online tools.
- Your county assessor's office publishes property values for tax purposes, which you can find online for free but may differ from market value.
What public records tell you about your home's value
Your county assessor's office maintains a public record of your property's assessed value, which is used to calculate property taxes. You can look this up for free on your county's website by searching your address. The assessed value is usually lower than what your home would sell for, because assessors use different methods than the market does.
The assessor's value is not the same as your home's market value. A home assessed at $250,000 might sell for $280,000 or $320,000 depending on condition, location, and how many buyers want it. Assessed values are updated every one to three years depending on your state, so they can lag behind real price changes in your neighborhood.
You can also find the sale price of homes near yours by searching your county's deed records or using sites like Zillow's "Zestimate" tool, which shows recent sales. These comparable sales are the most reliable clues to what your home is worth, because they're actual prices people paid, not estimates.
How to use online tools to estimate your home's value
Start with Zillow, Redfin, or Realtor.com. Type in your address and the site will show you an estimate, recent sales nearby, and how your home compares to others on the market. These tools are free and take less than a minute. Write down the estimate and check it on at least two different sites — if they all say roughly the same number, you're probably in the right ballpark.
Online estimates work better in some places than others. In dense urban areas with lots of recent sales, they're usually within 5 to 10 percent of actual value. In rural areas, small towns, or neighborhoods where homes rarely sell, the estimate can be much further off. If your home has unusual features — a pool, a large lot, a recent major renovation — the algorithm may not account for it.
Use online estimates to understand the range, not to make a final decision. If Zillow says $300,000 and Redfin says $310,000, your home is probably worth somewhere between $295,000 and $320,000. If one site says $250,000 and another says $350,000, something is wrong — either the sites are using different data, or your home has features that confuse the algorithm.
When to order a professional appraisal
You need a professional appraisal if you're refinancing a mortgage, taking out a home equity loan, or contesting your property tax assessment. Your lender will order it for you if you're refinancing. If you're challenging your tax assessment, your county assessor's office can tell you how to request a formal appraisal or appeal.
You can also order an appraisal on your own if you want a definitive answer for estate planning, divorce proceedings, or insurance purposes. Contact a licensed appraiser in your state — your lender can recommend one, or you can search the American Society of Appraisers website. The appraisal takes one to two weeks and costs $300 to $700 depending on your home's size and location.
An appraisal is more accurate than an online estimate because the appraiser sees the actual condition of your home and adjusts for things an algorithm can't detect — a new roof, outdated plumbing, a finished basement, or poor condition. The appraiser also has access to detailed local sales data and understands the neighborhood in ways a computer program does not.
How a real estate agent's market analysis works
If you're thinking about selling, contact a local real estate agent and ask for a comparative market analysis. The agent will visit your home, take photos, and pull recent sales of similar homes in your area. They'll adjust the prices up or down based on differences — a home with an updated kitchen might be worth more, while one needing a new roof might be worth less.
The CMA is free because the agent is hoping you'll list your home with them. It's more detailed than an online estimate and usually more accurate, because the agent knows the local market and can see your home in person. The agent will also tell you what homes like yours are actually selling for, not just what they're listed for — an important difference.
You can get CMAs from multiple agents to compare their estimates. If three agents say your home is worth $320,000 to $340,000, that's a strong signal. If one agent says $280,000 and another says $380,000, ask each one to explain their reasoning — one may be more experienced or have access to better data.
Understanding the difference between list price and sale price
The price a home is listed for is not the same as what it actually sells for. A home listed at $300,000 might sell for $285,000 if there are few buyers, or $320,000 if multiple people want it. When you're looking at comparable sales to estimate your home's value, use the actual sale price, not the list price.
You can find recent sale prices on Zillow, Redfin, or your county's deed records. Most sites show both the list price and the final sale price so you can see the difference. In a buyer's market (more homes for sale than buyers), homes often sell below list price. In a seller's market (more buyers than homes), they often sell above list price.
The time it took to sell also matters. A home that sold in two weeks probably sold close to market value. A home that sat for three months before selling probably went for less than market value, because the seller had to lower the price to attract a buyer. When you're comparing your home to others, look for homes that sold recently and quickly.
Factors that affect how much your home is worth
Location is the biggest factor — two identical homes in different neighborhoods can have very different values. A home near good schools, public transit, or a downtown area is usually worth more than one in a remote location. Neighborhood safety, walkability, and local job markets also affect value.
The home's condition and age matter significantly. A well-maintained 20-year-old home is worth more than a neglected 10-year-old one. Recent upgrades like a new roof, updated electrical system, or modern kitchen add value. Deferred maintenance — a leaking roof, old plumbing, or foundation problems — reduces value.
Size and layout affect value, but not always in a straight line. A 2,000-square-foot home with an efficient layout is often worth more than a 2,200-square-foot home with an awkward floor plan. The number of bedrooms and bathrooms matters, but so does whether the spaces are functional and appealing to buyers.
Market conditions change the value of your home even if nothing about the home itself changes. During a seller's market, homes appreciate quickly. During a buyer's market, values can stay flat or decline. Interest rates, local job growth, and the overall economy all affect how much people are willing to pay.
Frequently Asked Questions
How often should I check my home's value?
If you're just tracking it out of curiosity, once a year is enough. If you're planning to refinance or sell within the next year, check every few months to watch the trend. Online estimates update as new sales data comes in, usually monthly or quarterly depending on the site.
Can I use an online estimate to refinance my mortgage?
No. Lenders require a professional appraisal ordered by a licensed appraiser. Online estimates are not accepted because they're not verified by a person who has seen your home. Your lender will order the appraisal for you if you apply to refinance.
What if my home's assessed value is much lower than what I think it's worth?
Assessed value and market value are different things, so this is normal. Assessed values are usually lower because they're used for tax purposes, not for sale. If you think your assessed value is unfairly low and it's affecting your taxes, you can appeal to your county assessor's office — the process varies by state.
Should I pay for an appraisal if I'm just curious about my home's value?
No. Start with free online estimates and a CMA from a real estate agent. A professional appraisal costs $300 to $700 and is only necessary if you need it for a lender, a legal proceeding, or a formal reason. For general knowledge, online tools are accurate enough.
Why do different websites give me different estimates for my home?
Each site uses different data sources, algorithms, and recent sales to calculate estimates. Zillow might weight recent sales differently than Redfin, or one site might have access to more local data. If estimates vary widely, your home probably has features the algorithms struggle with, and a real estate agent's analysis would be more reliable.