The three main ways to find your home's value
Home value comes down to what a buyer would actually pay for your house right now. You can find this number three ways: by looking at what similar homes sold for recently, by getting a professional appraisal, or by using an online estimate tool. Each method gives you a different level of detail and costs different amounts of money or time.
The method you choose depends on why you need the number. If you're selling, you'll want a real estate agent's analysis or a professional appraisal. If you're refinancing a mortgage, your lender will order the appraisal for you. If you're just curious about your home's worth or need it for property taxes, an online estimate often works fine.
Key Takeaways
- A comparative market analysis from a real estate agent shows you what homes like yours sold for in the past three to six months in your area.
- A professional appraisal costs $300 to $500 and is ordered by your lender during a mortgage transaction; it's the most formal valuation.
- Online estimate tools like Zillow, Redfin, and county assessor websites give you a starting point but can be off by 5 to 20 percent depending on how recent your home's data is.
- Your county assessor's office sets a value for property tax purposes, which is public record and often lower than market value.
- The sale price of your home depends on condition, location, recent upgrades, and local market demand — not just the estimated value.
Comparative market analysis: what a real estate agent provides
A comparative market analysis (CMA) is a report showing what homes similar to yours sold for recently. A real estate agent pulls this together by looking at homes in your neighborhood that sold in the past three to six months. They match homes by size, age, condition, lot size, and features — things like number of bedrooms, garage type, and whether the home has a basement.
This is the most useful method if you're thinking about selling. The agent shows you the actual sale prices, not asking prices — what people really paid. They also note which homes sold quickly and which sat on the market, which tells you whether your neighborhood is moving fast or slow right now. You can ask for a CMA from any real estate agent in your area, and it costs you nothing because agents do this work to earn your listing.
The CMA is not a formal appraisal and won't satisfy a lender, but it's based on real transactions, not algorithms. The weakness is that no two homes are identical — one sold home might have had a new roof and another might not, and the agent has to make judgment calls about how much those differences matter.
Professional appraisals: the formal method
A professional appraisal is an official valuation done by a licensed appraiser. The appraiser visits your home, measures it, photographs it, and inspects its condition. They look at the same comparable sales a real estate agent would, but they also consider the home's structural condition, systems (roof, HVAC, plumbing), and any deferred maintenance. They produce a written report that lenders accept as proof of value.
If you're getting a mortgage, refinancing, or taking out a home equity loan, your lender orders and pays for the appraisal — you don't choose the appraiser. The cost is typically $300 to $500 and gets added to your closing costs or loan fees. If you want an appraisal for your own reasons (selling without an agent, settling an estate, or insurance purposes), you can hire one yourself and pay out of pocket.
An appraisal is more thorough than an online estimate but also more expensive and time-consuming. It takes one to two weeks to complete. The appraiser's job is to be neutral and defensible, not to give you the highest number — they're protecting the lender's investment, not your interests.
Online estimate tools and what they actually measure
Websites like Zillow, Redfin, Realtor.com, and your county assessor's website all offer free home value estimates. These tools use public records — past sales, property taxes, square footage, lot size — and algorithms to guess what your home is worth. You type in your address and get a number in seconds.
The speed is the main advantage. The weakness is accuracy. These tools work best in neighborhoods where homes sell frequently and are similar to each other. They work worst in rural areas, in neighborhoods with very different home types, or when your home has unusual features. The estimate can be off by 5 to 20 percent depending on how recent the data is and how much your home differs from the comparables the algorithm found.
Online estimates are useful for a rough sense of direction — whether your home is worth $300,000 or $500,000 — but not for making a major financial decision. If you're refinancing or selling, you need a real appraisal or CMA, not an online tool. If you're just curious or need a number for insurance or property tax purposes, an online estimate is a reasonable starting point.
Your county assessor's value versus market value
Your county assessor sets a value on your home for property tax purposes. This number is public record and you can find it on your county's website by searching your address. The assessor's value is usually lower than what your home would sell for on the open market, because it's meant to be conservative and is often updated only every few years.
The assessor's job is to value all homes in the county fairly for tax purposes, not to predict what your home would sell for. In some states, the assessed value is capped or grows slowly even if the market value rises. In others, it's reassessed more frequently. The rules vary by state and county.
You can use the assessor's value as one data point, but don't rely on it alone if you're selling or refinancing. It's usually lower than market value and may be outdated. However, if you think the assessed value is too high and it's raising your property taxes unfairly, you can file an appeal with your assessor's office — the process and deadline vary by county.
What affects your home's actual sale price
An estimate or appraisal gives you a starting point, but the price your home actually sells for depends on factors that change day to day. The condition of your home matters — a house that needs a new roof will sell for less than one in move-in condition, even if the estimate is the same. Location within your neighborhood matters too: a home on a quiet street may sell for more than one on a busy road, even if they're the same size.
Market timing affects price. In a seller's market where homes sell quickly and buyers compete, you may sell above the estimate. In a buyer's market where homes sit for months, you may have to accept less. Recent upgrades — a new kitchen, updated electrical, fresh paint — can push the price up. Deferred maintenance — a sagging roof, old windows, outdated systems — pushes it down.
The buyer's motivation also matters. A buyer who needs to close quickly may offer less. A buyer who loves the home and has other options may offer more. Your real estate agent's skill at marketing and negotiating affects the final price too. The estimate is a guide, not a may provide.
When you need each method
| Your situation | Best method | Why |
|---|---|---|
| Selling your home | Comparative market analysis from a real estate agent | Based on actual recent sales in your area; helps you set a realistic asking price |
| Refinancing a mortgage | Professional appraisal (ordered by your lender) | Lenders require a formal appraisal to approve the loan |
| Getting a home equity loan or line of credit | Professional appraisal (ordered by your lender) | Lenders use the appraisal to determine how much you can borrow |
| Checking your home's worth out of curiosity | Online estimate tool | Free, fast, and good enough for a rough sense of value |
| Property tax assessment or insurance purposes | County assessor's value or online estimate | Public record and sufficient for these administrative purposes |
| Settling an estate or divorce | Professional appraisal | Courts and attorneys recognize formal appraisals as defensible valuations |
How to get your free guide with each method
To get a comparative market analysis, contact two or three real estate agents in your area and ask for a CMA. You can find agents through Zillow, Realtor.com, or by asking neighbors who recently sold. The agent will usually meet with you or send the report by email. There's no cost to you.
To order a professional appraisal on your own, search online for "appraiser near me" or ask your bank or mortgage lender for a referral. You'll pay upfront, usually by check or credit card. The appraisal takes one to two weeks. If your lender is ordering the appraisal (during a refinance or purchase), you don't need to do anything — the lender handles it.
To use an online estimate tool, go to your county assessor's website (search "[your county] assessor") and enter your address, or use Zillow, Redfin, or Realtor.com. The estimate appears instantly. Keep in mind that these tools update periodically, so the number may change over time as new sales data comes in.
Frequently Asked Questions
How often should I check my home's value?
If you're just tracking it out of interest, once or twice a year is enough. If you're planning to sell or refinance within the next year, check it every few months to watch market trends in your area. Online estimates update as new sales data comes in, usually monthly or quarterly depending on the tool.
Can I use an online estimate to refinance my home?
No. Lenders require a professional appraisal ordered through them. An online estimate is not acceptable because it's not a formal valuation and the lender has no way to verify it. Your lender will order and pay for the appraisal as part of the refinance process.
What if my home's estimate seems too low?
If it's an online estimate, remember that these tools are approximations and can be off. Get a comparative market analysis from a real estate agent or a professional appraisal to see if the estimate is actually low or if the tool just lacks recent data on your home. If it's your county assessor's value and you think it's unfair for tax purposes, you can file an appeal — contact your assessor's office for the deadline and process in your county.
Do I need an appraisal if I'm selling my home without a real estate agent?
You don't need one to sell, but many buyers will want one before they make an offer, especially if they're getting a mortgage. If you're selling without an agent, you can get a professional appraisal yourself to show potential buyers, or you can wait and let the buyer's lender order one. Getting one upfront can speed up the sale.
Why is my home's online estimate different from what a real estate agent said?
Online tools use algorithms and public data; real estate agents use their knowledge of your specific neighborhood, recent sales, and current market conditions. An agent can account for things like your home's condition, recent upgrades, or local demand that an algorithm might miss. If the numbers are far apart, ask the agent to explain which comparable sales they used.