The three main ways to find your home's value

You can find your home's estimated value through online tools, a professional appraisal, or a real estate agent's market analysis. Each method gives you a different kind of number — some are free and instant, others take time and cost money, and they often disagree with each other. Which one you need depends on why you're asking: selling, refinancing, property taxes, or just curiosity all point to different answers.

The fastest route is an online estimate. The slowest and most expensive is a full appraisal by a licensed appraiser. In between is a comparative market analysis (CMA) from a real estate agent, which is usually free but only if you're willing to listen to a sales pitch. None of these is "the" value — your house is worth what someone will pay for it on the day you sell, and that's unknowable until it happens.

Key Takeaways

  • Online tools like Zillow, Redfin, and county assessor websites give free estimates in minutes, but they're based on old data and miss details about your specific house.
  • A professional appraisal costs $300 to $500 and is required by lenders for mortgages and refinances, but it's the most accurate for those purposes.
  • A real estate agent's market analysis is free and based on recent sales of similar homes in your area, but the agent's goal is to list your house, not give you neutral information.
  • County assessor records show what your house was assessed for property taxes, which is often much lower than market value and updated infrequently.
  • Your home's value varies by purpose: tax assessment, insurance replacement cost, and sale price are three different numbers.

Online estimates: fast, free, and built on incomplete data

Sites like Zillow, Redfin, Trulia, and Realtor.com let you type your address and get a number in seconds. These estimates are free and require no phone calls. They're useful for a rough sense of whether your neighborhood has gone up or down, or to compare your house to others on the same block.

The catch is that these tools work from public records — mostly sales of nearby homes, tax assessments, and basic property details like square footage and lot size. They don't know about your kitchen renovation, your roof's age, foundation problems, or that your neighbor's house sold for more because it has a better view. The algorithm also doesn't know if your area is gentrifying fast or declining. Most sites update their estimates monthly, but the underlying sales data is often three to six months old.

Zillow calls its estimate a "Zestimate." Redfin calls theirs an "estimate." Both come with a margin of error — Zillow's is typically within 5 to 20 percent of actual sale price, but that range is wide enough to matter. Use these as a starting point, not a final answer. If you're refinancing or selling, you'll need something more solid.

County assessor records: what you owe taxes on, not what your house is worth

Every county assessor's office keeps a public record of what each property was assessed for property tax purposes. You can find this online by searching your county name plus "assessor" or "property appraiser," then entering your address. The record is free and official.

The assessed value is almost always much lower than market value — sometimes half or less. That's by design: assessments are meant to be a fraction of market value, and they're updated infrequently, often only when a property sells or the county does a reassessment cycle. In some states, assessed value is frozen until the house changes hands. This number tells you what you're paying property taxes on, not what your house would sell for.

The assessor's record does include useful details: lot size, year built, number of bedrooms and bathrooms, square footage, and sometimes recent sales history. These facts are reliable for comparison purposes, even if the value estimate isn't.

Professional appraisals: the most accurate, but only for lending

A professional appraisal is a written estimate by a licensed appraiser who visits your home, measures it, photographs it, and compares it to recent sales of similar homes in your area. The appraiser looks at condition, upgrades, location, and market trends. This is the gold standard for accuracy — lenders require it before they'll give you a mortgage or refinance.

An appraisal costs $300 to $500 depending on your home's size and your region. You pay upfront, and the lender gets a copy of the report. The process takes one to two weeks from scheduling to final report. If you're refinancing, the lender orders the appraisal and you pay for it as part of closing costs. If you're selling, you don't need one unless the buyer's lender requires it — and they usually do.

The appraisal is binding for lending purposes: if the appraised value comes in lower than the sale price, the lender won't lend the full amount, and the deal can fall apart. This is why appraisals matter — they protect the lender's money, not yours. If you're just curious about your home's value and not borrowing, an appraisal is overkill.

Real estate agent market analyses: free, but with a sales motive

If you contact a real estate agent and say you're thinking about selling, they'll usually offer a free comparative market analysis (CMA). The agent pulls recent sales of similar homes in your neighborhood — typically the last three to six months — and compares them to your house. The result is a price range they think your home would sell for.

A CMA is based on actual recent sales, which makes it more current than online estimates. The agent also knows the local market in ways an algorithm doesn't: which neighborhoods are hot, what buyers in your area care about, and what similar homes actually sold for versus their listing price. This information is valuable.

The downside is that the agent's goal is to list your house and earn a commission. Their estimate may be higher than what you'd actually get, to convince you to sign with them. Some agents are honest about this; others aren't. If you want a CMA, get one from two or three agents and look for overlap in their ranges. Don't sign a listing agreement based on one agent's estimate.

What value you actually need depends on why you're asking

If you're refinancing, your lender will order an appraisal. You don't choose the method — the lender does. The appraisal is what matters for the loan amount.

If you're selling, start with online estimates and a CMA from an agent to get a range. Then list at a price based on recent comparable sales in your area, not on what you paid or what you think it should be worth. The market decides the price, not you.

If you're buying insurance, the insurer cares about replacement cost — what it would cost to rebuild your house from scratch if it burned down. This is different from market value and is usually higher. Your insurance agent will estimate this, or you can get a separate replacement cost appraisal.

If you're contesting property taxes, you'll need to show that the assessed value is too high. This usually means hiring an appraiser or gathering sales data on comparable homes. The process varies by state and county.

If you're just curious, an online estimate is enough. It won't be exact, but it'll give you a ballpark and let you track trends over time.

Why your home's value changes, and what affects it most

Your home's value moves with the local market — interest rates, job growth, school quality, and neighborhood desirability all shift what buyers will pay. It also moves with your house itself: a new roof, updated kitchen, or fresh paint can add value, while deferred maintenance, foundation cracks, or a bad roof can subtract it.

Online tools catch market trends but miss house-specific details. An appraiser catches both. The gap between what an online tool says and what an appraiser says often comes down to condition: the tool sees "3-bedroom house built in 1985" and compares it to other 1985 houses, but doesn't know yours has a new HVAC system and the neighbor's doesn't.

If you've made major improvements, mention them when you get an estimate — online tools won't know about them. If you're selling, document the work with receipts and photos; buyers and appraisers care about proof, not your word.

Frequently Asked Questions

Is Zillow's estimate accurate?

Zillow's estimate is usually within 5 to 20 percent of actual sale price, which means it can be off by tens of thousands of dollars on a half-million-dollar home. It's useful for tracking trends and comparing your house to neighbors' houses, but not for decisions that depend on precision, like refinancing or selling.

Do I need an appraisal if I'm just selling my house?

You don't need one upfront, but the buyer's lender will order one as a condition of the mortgage. If the appraisal comes in low, the deal can stall. You can get your own appraisal before listing to know what to expect, but it's not required.

Can I use an online estimate to refinance?

No. Lenders require a professional appraisal ordered through them. Online estimates don't count for lending purposes because they're not verified by a licensed appraiser who has seen your house in person.

What if the appraisal is lower than the sale price?

The buyer's lender won't lend more than the appraised value. You'll have to lower the price, the buyer has to put down more money, or the deal falls apart. This is why appraisals matter — they're a check on whether the price is realistic for the market.

How often should I check my home's value?

If you're not selling or refinancing, checking once or twice a year is enough to see trends. Online tools update monthly, so you can check whenever you want at no cost. If you're planning to sell within a year, get a CMA from an agent closer to your listing date — the market moves fast and estimates from six months ago may be outdated.