The most direct way to check your home's value
The fastest way to get a rough estimate is to search your address on a free online tool like Zillow, Redfin, Trulia, or your county assessor's website. These sites pull from public records—sales data, tax assessments, property details—and show you what they think your home is worth in seconds. The number you see is called an estimate or Zestimate (on Zillow), and it's a starting point, not a final answer.
The county assessor's website is often the most reliable free source because it's based on the actual tax value your local government uses. Search "[your county] assessor" plus your state, enter your address, and you'll see the assessed value. This is what your property taxes are calculated from, so it's a real number tied to your actual property record.
If you want something more precise—for a refinance, a sale, or an insurance claim—you'll need a professional appraisal. An appraiser is a licensed person who visits your home, measures it, checks its condition, and compares it to similar homes that sold recently in your area. An appraisal costs $300 to $500 and takes a week or two. Your lender will order one if you're refinancing; if you're selling, your real estate agent can recommend an appraiser.
Key Takeaways
- Free online estimates from Zillow, Redfin, or your county assessor give you a ballpark figure in minutes but are not precise enough for major financial decisions.
- Your county assessor's website shows the official assessed value used for property taxes and is usually more reliable than commercial estimate sites.
- A professional appraisal ordered by a licensed appraiser is the only way to get an official value for refinancing, selling, or insurance purposes.
- Online estimates can be off by 5 to 20 percent or more, especially in rural areas or homes with unusual features.
- Real estate agents in your area can give you a market opinion based on recent sales without charging you, though it's not a formal appraisal.
Why online estimates vary so much
Different websites use different data and different math. Zillow might use recent sales, tax records, and rental data. Redfin might weight recent sales more heavily. Your county assessor uses only what's on file, which may not include recent renovations you did. None of them know if you replaced the roof last year, added a deck, or let the foundation crack.
The further your home is from a recent sale of a similar home, the wider the estimate range gets. In a busy suburb where homes sell every month, the estimate is usually closer. In a rural area or a neighborhood where homes rarely change hands, the estimate can be very wrong.
Online tools also struggle with homes that are unusual—a converted barn, a house on a large lot, a property with a second dwelling unit. The algorithm doesn't know what to compare it to, so the estimate becomes less reliable.
What a professional appraisal actually does
An appraiser licensed by your state will visit your home and spend an hour or two looking at it inside and out. They measure the square footage, note the condition of the roof, foundation, plumbing, and electrical systems, and check for damage or needed repairs. They photograph the property and the neighborhood.
Then they research recent sales of homes similar to yours—same size, same age, same neighborhood, sold within the last few months. They adjust those prices up or down based on differences. If your home has a newer kitchen and theirs didn't, they add value. If yours needs a new roof and theirs didn't, they subtract. The result is a formal written report with a single value and the reasoning behind it.
This appraisal is what banks use to decide how much they'll lend you. It's also what you'd use if you're contesting your property tax assessment or filing an insurance claim. The cost is higher than a free estimate, but the number is defensible in writing.
When you need each type of value check
Free online estimate: You're curious about your home's worth, thinking about selling in a few years, or want a rough number for net worth calculations. This is fine for personal knowledge but not for any financial decision.
County assessor value: You want to understand your property tax bill or you're contesting your assessment. The assessor's value is the official one for tax purposes, though it may lag behind market value by a year or two.
Real estate agent's market opinion: You're thinking about selling soon and want to know what a local expert thinks the market will bear. Agents do this for free as part of their job. It's not a formal appraisal, but it's based on their knowledge of recent sales in your area.
Professional appraisal: You're refinancing, taking out a home equity loan, selling your home, or settling an estate. Your lender or the situation will tell you when you need one. This is the only type that carries legal weight.
How to order a professional appraisal
If you're refinancing, your lender will order the appraisal for you and add the cost to your closing costs. You don't choose the appraiser—the lender does, to keep it independent. The appraisal usually takes 7 to 14 days.
If you're selling, your real estate agent can recommend appraisers they've worked with. You pay for it upfront, though in some cases the buyer's lender will order their own appraisal anyway.
If you need an appraisal for another reason—a divorce settlement, an insurance claim, a property tax dispute—search "[your state] appraiser" or ask your county assessor's office for a list of licensed appraisers. Call a few and ask their fee and turnaround time. Most will give you a quote over the phone.
What to do if your online estimate seems wrong
First, check your county assessor's value. If it's very different from the online estimate, that's normal—assessments update on a schedule and may be a year or two behind market value.
Second, look at the recent sales the website is using to calculate the estimate. Most sites let you see which homes they compared yours to. If those homes are very different from yours—different size, different neighborhood, sold a long time ago—the estimate is less reliable.
Third, if you're planning to refinance or sell, don't rely on any estimate. Order a real appraisal. The cost is small compared to the money at stake, and you'll have an official number that a lender or buyer will accept.
Frequently Asked Questions
Is the Zillow estimate the same as an appraisal?
No. Zillow's estimate is a computer guess based on public data. An appraisal is a licensed professional's written opinion based on an in-person inspection and recent comparable sales. Banks will not lend based on a Zillow estimate. You need a real appraisal for any loan or legal transaction.
Can I use my property tax assessment as my home's value?
You can use it as a reference, but it's usually lower than market value because assessments are designed to be conservative and often lag behind current prices. For a refinance or sale, you need a current appraisal, not a tax assessment.
How often should I check my home's value?
If you're just curious, checking once a year on a free site is fine. If you're planning to refinance or sell, check the market value a few months before you plan to act, then order a professional appraisal when you're ready to move forward.
What if the appraisal comes in lower than I expected?
If you're refinancing, a low appraisal can block the deal or force you to put more money down. You can ask the appraiser to reconsider if you think they made a factual error, or you can order a second appraisal from a different appraiser. If you're selling, a low appraisal tells you what the market will actually pay, and you may need to adjust your price.
Do I need an appraisal if I'm just refinancing to a lower rate?
Usually yes, but some lenders offer "no-appraisal" refinances if your home's value has clearly gone up or if you're only borrowing a small amount. Ask your lender whether an appraisal is required for your specific situation.