The fastest way to check your home's value is a free online estimate from Zillow, Redfin, or Realtor.com
You can get a rough number in under five minutes by entering your address on any of these sites. They use public records, recent sales nearby, and their own algorithms to generate what's called an automated valuation model, or AVM. The estimate appears immediately and costs nothing.
These estimates are usually within 5 to 10 percent of what a professional appraiser would say, but they can be off by more if your house has unusual features, recent major repairs, or if the neighborhood has changed fast. The sites update their numbers as new sales data comes in, so checking again in a few months will give you a fresher picture.
If you need something more reliable—because you're refinancing, selling soon, or making a major financial decision—you'll want a real appraisal or a comparative market analysis from a local real estate agent. But for a quick sense of where you stand, the free online tools are the place to start.
Key Takeaways
- Zillow, Redfin, and Realtor.com give free estimates in minutes, though they're typically accurate within 5 to 10 percent.
- A professional appraisal costs $300 to $500 but is required by lenders and more reliable than an online estimate.
- A comparative market analysis from a real estate agent is free and shows what similar homes sold for in your area recently.
- Your home's value changes with the market, recent sales nearby, and condition of your house, so checking annually makes sense if you're tracking it.
- Tax assessments and online estimates often differ because assessors use older data and different methods than real estate sites.
What a professional appraisal tells you that an online estimate doesn't
A professional appraisal is a formal inspection and valuation done by a licensed appraiser. They walk through your house, measure rooms, note the condition of the roof and foundation, check recent comparable sales, and produce a written report. The cost is usually $300 to $500, depending on your home's size and location.
Lenders require an appraisal before they'll refinance or give you a mortgage. If you're not borrowing money, you don't need one unless you're selling and want to know your bottom line, or you're settling a divorce or estate and need an official number for legal purposes.
The appraisal is more detailed than an online estimate because the appraiser sees the actual condition of your house—whether the plumbing works, if the roof is near the end of its life, whether the kitchen is updated or dated. An online tool can't see that. On the other hand, an appraisal is a snapshot in time; it's only as current as the day it was done.
How a real estate agent's market analysis works
If you're thinking about selling, ask a local real estate agent for a comparative market analysis (CMA). The agent pulls recent sales of homes similar to yours—same neighborhood, similar size, similar condition—and shows you what they sold for. This is free and usually takes a few days because the agent needs to research local records.
A CMA is often more useful than an online estimate because it's based on actual sales in your specific area, not a national algorithm. The agent also knows whether your neighborhood is hot or cooling, whether homes are selling fast or sitting, and what buyers are actually paying versus what they're asking.
The catch is that the agent has a financial incentive to list your house, so they may lean toward a higher number to win your business. Get CMAs from two or three agents to see where the consensus lands. You can also ask the agent to show you the actual sales data—the addresses, sale prices, and dates—so you can verify the numbers yourself.
Why your tax assessment and your home's market value are usually different
Your local tax assessor estimates your home's value for property tax purposes, and that number often doesn't match what a real estate site or appraiser says. Assessors typically use older data—sometimes years old—and they're not trying to predict what your house would sell for today. They're estimating its value for tax revenue purposes, which is a different calculation.
In some states, assessments are updated every year; in others, every few years or only when the house changes hands. If your area has had a big run-up in home prices, your assessment may be significantly lower than the current market value. If prices have fallen, it might be higher.
You can usually find your assessment on your county assessor's website or your property tax bill. If you think it's wrong, most counties allow you to challenge it, though the process and deadlines vary by location. A real estate agent or appraiser can help you decide whether it's worth contesting.
How recent sales in your neighborhood shape your home's value
The most reliable indicator of what your house is worth is what similar homes sold for recently in your area. Comparable sales—or "comps"—are the foundation of every valuation method, from online estimates to professional appraisals to real estate agent analyses.
You can search for recent sales yourself on Zillow, Redfin, or your county assessor's website. Look for homes that sold in the last three to six months, in your neighborhood or a very similar one, with similar square footage, lot size, and condition. The more recent the sale and the closer the match, the more weight it should carry in your thinking.
If there haven't been many sales nearby recently, the estimates become less reliable because the algorithm has less data to work with. In a slow market or a rural area, you may need to look at a wider geographic area or a longer time window, which introduces more uncertainty.
What affects your home's value between now and when you sell
Your home's value isn't fixed. It moves with the broader market—interest rates, local job growth, and inventory all play a role. It also changes based on what you do to the house. A new roof or updated kitchen can add value; deferred maintenance or a neighborhood decline can subtract it.
Major renovations don't always return their full cost. A $50,000 kitchen remodel might add $30,000 to $40,000 to your home's value, depending on the market and the quality of the work. Cosmetic updates—paint, landscaping, cleaning—are cheaper and often return more of their cost because they affect the first impression.
If you're planning to sell within a few years, focus on repairs and updates that matter most to buyers in your area. A real estate agent can tell you what's worth doing and what isn't. If you're staying put, maintain the house to avoid bigger problems later, but don't expect every dollar you spend to come back when you eventually sell.
When to check your home's value and why timing matters
If you're refinancing or selling soon, check your home's value now so you know what to expect. If you're just tracking it for your own knowledge, checking once a year is usually enough—the market doesn't move so fast that monthly checks add much value.
Check again after major changes: if you've done significant renovations, if your neighborhood has had a lot of new development, or if interest rates have shifted sharply. These events can move your home's value noticeably in a few months.
If you're using your home's value to decide whether to refinance or take out a home equity loan, remember that the lender will order their own appraisal. An online estimate that says your house is worth $500,000 doesn't mean the bank will agree. Get a sense of the range from multiple sources, but plan for the lender's appraisal to be the final word.
Frequently Asked Questions
Is the Zillow estimate accurate?
Zillow's estimate is usually within 5 to 10 percent of market value, but it can be off by more if your house is unusual, recently renovated, or in a neighborhood with few recent sales. It's a useful starting point, not a may provide of what you'll get if you sell.
Do I need an appraisal if I'm not selling or refinancing?
No. An appraisal is required by lenders but optional otherwise. If you're just curious about your home's value, free online estimates and a real estate agent's market analysis are enough. An appraisal makes sense only if you need an official number for legal or financial purposes.
Can I challenge my property tax assessment if I think it's too high?
Yes, most counties allow you to file a formal challenge, though deadlines and procedures vary by location. Check your county assessor's website for the process. You'll typically need to show that comparable homes sold for less or that your assessment is out of line with similar properties.
How much does a new roof or kitchen add to my home's value?
It depends on the market and the quality of the work, but major renovations typically return 50 to 80 percent of their cost. A real estate agent in your area can tell you what upgrades matter most to buyers and which ones are worth the investment before you sell.
What if my home's value has dropped since I bought it?
Home values fluctuate with the market. If you're not selling soon, a temporary dip usually doesn't matter. If you need to refinance or sell now, talk to a lender or real estate agent about your options. You may still have equity even if the value has fallen since purchase.