What determines your home's market value
Your home's market value is what a buyer would pay for it today in a normal sale—not what you paid for it, not what you owe on the mortgage, and not what the tax assessor says it's worth. The market value depends on what similar homes in your area sold for recently, the condition of your house, its location within your neighborhood, and how many buyers are competing for homes like yours right now.
The strongest signal is comparable sales—homes similar to yours that closed in the last 90 days within a few blocks or the same neighborhood. A home that sold for $320,000 three months ago on your street tells you more than any estimate can. But if no identical home has sold nearby recently, appraisers and real estate agents look at homes with the same number of bedrooms, bathrooms, square footage, and lot size, then adjust up or down based on differences like a newer roof, a finished basement, or a busy road nearby.
Key Takeaways
- Comparable sales from the last 90 days in your neighborhood are the most reliable way to estimate value, and you can find them yourself through county records or real estate sites.
- A professional appraisal costs $300 to $500 and is required by lenders but reflects what the home would sell for, not what you could list it for.
- Real estate agent market analyses are free and often more current than appraisals because agents track active listings and pending sales constantly.
- Online estimates from Zillow, Redfin, or similar sites are a starting point but can be off by 5 to 20 percent because they use older data and cannot see inside your home.
- Your home's actual market value only matters if you are selling, refinancing, or contesting your property tax assessment.
Finding comparable sales yourself
The fastest way to see what homes like yours have sold for is to check your county assessor's website or county records office. Most counties now publish sale prices online, searchable by address or neighborhood. Search for homes that sold in the last 60 to 90 days, with the same bedroom and bathroom count, similar square footage, and ideally on the same street or within a few blocks.
Real estate sites like Zillow, Redfin, and Realtor.com also show recent sales and let you filter by neighborhood, price range, and home features. These sites pull data from the Multiple Listing Service (MLS), which is where real estate agents list homes for sale. The MLS data is usually current within 24 to 48 hours, so you see pending sales and price changes quickly. If you see a home listed for $350,000 that is similar to yours, that is the asking price—not the sale price. Look instead at the "sold" tab to see what homes actually closed for.
When you find three to five comparable homes, note the sale price, sale date, square footage, lot size, age of the home, and any major differences from your own home (new roof, updated kitchen, finished basement, or problems like foundation cracks). The average of those sale prices gives you a rough range for your home's value.
Getting a professional appraisal
A professional appraisal is a formal estimate done by a licensed appraiser who inspects your home inside and out, measures square footage, photographs the property, and researches comparable sales. The appraisal report is a legal document that lenders use to decide how much they will loan you. An appraisal typically costs $300 to $500 depending on your home's size and your location.
You need an appraisal if you are refinancing your mortgage or applying for a home equity loan. If you are selling, the buyer's lender will order an appraisal, so you do not pay for it directly—the buyer does, though the cost is often rolled into closing costs. If you want an appraisal just to know your home's value, you can order one yourself through a local appraisal management company or by asking a mortgage lender for a referral.
An appraisal is more thorough than an online estimate, but it is also a snapshot in time. If the market shifts or your neighborhood changes, the appraisal becomes less accurate. Appraisers are trained to be conservative, so an appraisal may come in lower than what you think your home is worth—especially if comparable sales are sparse or your home has unusual features.
Using a real estate agent's market analysis
A real estate agent can provide a Comparative Market Analysis (CMA) or market analysis at no cost. Agents do this routinely for sellers who are thinking about listing their home. The agent pulls recent sales, active listings, and pending sales in your neighborhood, adjusts for differences between your home and the comparables, and gives you a range of what your home might sell for.
An agent's analysis is often more current than an appraisal because agents track the market constantly and see price changes and new listings in real time. If you are thinking about selling in the next year or two, getting a CMA from a local agent is worth doing. You can contact two or three agents and ask each for a market analysis—they will do it hoping you will list with them, so there is no charge to you.
The downside is that agents have an incentive to estimate high to win your business. If one agent says your home is worth $400,000 and another says $360,000, the truth is probably somewhere in between. Compare the comparables they used and ask why they adjusted prices up or down for specific features.
Understanding online home value estimates
Websites like Zillow (the "Zestimate"), Redfin, and Realtor.com show estimated home values based on public records, recent sales, and algorithms. These estimates are free and updated regularly, but they are not appraisals and should not be treated as gospel.
Online estimates work by analyzing thousands of sales in your area and finding patterns—homes with X bedrooms and Y square footage in your zip code tend to sell for Z dollars. But the algorithm cannot see inside your home, so it does not know if your kitchen was updated last year or if your roof is 20 years old and needs replacement soon. Studies show these estimates are typically within 5 to 20 percent of actual sale price, which means a $300,000 home could be estimated anywhere from $240,000 to $360,000.
Use online estimates as a starting point, not a final answer. If you see your home valued at $350,000 on Zillow but comparable sales in your neighborhood are running $320,000 to $330,000, the comparable sales are more reliable because they are based on actual transactions, not an algorithm.
When and why your home's value matters
Knowing your home's market value is important in three situations. First, if you are selling, you need to know the realistic price range so you do not overprice (and sit on the market) or underprice (and leave money on the table). Second, if you are refinancing or taking out a home equity loan, the lender will order an appraisal, and if your home's value has dropped, you may not be able to borrow as much as you expected. Third, if you think your property tax assessment is too high, you can challenge it using comparable sales as evidence.
If you are not selling, refinancing, or contesting your taxes, your home's market value is mostly academic. What matters more is whether you can afford your mortgage payment, property taxes, and maintenance costs. A home worth $500,000 that costs you $3,000 a month to carry is only a good investment if you can actually afford it.
Frequently Asked Questions
How often does my home's value change?
Home values shift with the market, which can move monthly or seasonally. In a hot market, values can rise 5 to 10 percent in a year. In a slow market, they may stay flat or decline. The only way to know your current value is to look at recent sales—estimates from six months ago are outdated.
Is my home's appraised value the same as its market value?
Not always. An appraisal is what a lender thinks the home is worth based on comparable sales and the appraiser's judgment. Market value is what a buyer will actually pay. An appraisal can come in lower than market value if the appraiser is conservative or if the market has moved up since the comparable sales closed.
Can I use my property tax assessment to estimate my home's value?
No. Property tax assessments are based on formulas set by your county or municipality and are often outdated. A home assessed at $250,000 for tax purposes might be worth $350,000 on the open market. Use comparable sales or an appraisal instead.
What if I cannot find comparable sales in my neighborhood?
If your home is unusual (a historic property, a custom build, or in a rural area with few sales), comparable sales may be sparse. In that case, a professional appraisal is worth the cost because the appraiser has training in adjusting for unique features and can look at a wider geographic area if needed.
Does my home's value affect my mortgage payment?
Your mortgage payment is locked in when you take out the loan and does not change if your home's value rises or falls. However, if your home's value drops significantly, you could end up owing more than the home is worth, which limits your options if you need to sell or refinance.