Real Estate Comps: A Modern Guide to Comparable Property Analysis

Real estate comps — comparable sales of similar homes nearby — are the foundation of nearly every home pricing decision. When you want to know what your house is worth, comps show you what buyers actually paid for properties like yours.

This guide covers how to find comps, what makes a property a strong comparable, and how to use that data to estimate your home's value with confidence.

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What are real estate comps

Real estate comps — short for "comparables" — are recently sold homes similar to yours in location, size, condition, and features. They're the closest thing to a price tag your home has. When you want to know what your house is worth, comps show you what buyers actually paid for homes like yours in your area.

The idea is simple: if a three-bedroom home with 1,800 square feet sold for $350,000 last month two streets over, that sale tells you something meaningful about your own three-bedroom, 1,800-square-foot home. Comps turn the abstract question of "what's my home worth?" into something concrete and grounded in real transactions.

Real estate agents, appraisers, buyers, and sellers all use comps. They're the foundation of nearly every pricing decision in residential real estate.

What are house comps? A plain-English definition

House comps — short for 'comparable sales' or 'comparables' — are recently sold homes similar enough to a target property that their sale prices can be used to estimate what the target home is worth today. The shorter way to say it: a comp is what a nearly identical home down the street just sold for.

Three details matter for the definition:

• Comps are sold prices, not list prices. A list price reflects what a seller hoped to get; a sold price reflects what a buyer actually paid. Only sold prices carry weight in a comp analysis.
• Comps are recent. In a fast-moving market, comps older than 90 days can be stale; in a slower market, comps up to 6 months old are generally usable. Appraisers typically default to a 3- to 6-month window.
• Comps are similar. Same neighborhood (ideally within a half-mile), same property type, similar size (within roughly 10% to 15% of square footage), similar age, layout, and condition. The closer the match, the more weight that comp carries.

The same comp methodology powers four very different uses: an agent's CMA (comparative market analysis) for a list price, an appraiser's report for a lender's loan-to-value calculation, an iBuyer's cash offer for a binding purchase price, and a homeowner's DIY estimate for equity tracking or refinance planning. The math is the same; the rules and tolerances differ slightly by use case.

For the underlying drivers of value that comps are quietly capturing, see our guide to what really determines property value.

Why comparable home sales matter for pricing

Pricing a home is tricky. Set the price too high, and your listing sits while buyers move on to other options. Price too low, and you leave money behind. Comps help you land in the right range because they reflect what the market has already accepted.

Here's why comps carry so much weight:

• Accurate pricing: Comps reveal what buyers actually paid, not what sellers hoped to get. That distinction matters when you're deciding on a list price.
• Negotiation support: When a buyer questions your asking price or you want to back up an offer, comps give you data to point to.
• Lender requirements: Mortgage lenders require appraisals before approving loans. Appraisers rely heavily on comps to determine value, so if your home doesn't appraise at the contract price, the deal can stall.

How to find comps for your house

Finding comps has become much easier over the past decade. You have several options, and the right one depends on how much time you have and how precise you want to be.

Request an instant home valuation online

Online valuation tools pull comp data automatically and generate an estimate in seconds. They're the fastest way to get a starting point, though Zillow's Zestimate has a 1.9% median error rate for on-market homes.

Opendoor, for instance, provides a free, no-obligation cash offer based on comparable sales and local market data. Get a cash offer to see where your home stands without doing the research yourself.

Search real estate websites for sold listings

Most real estate websites let you filter by "sold" or "recently sold" properties. This is key: active listings show asking prices, while sold listings show actual sale prices.

When you search, narrow your results by ZIP code, property type, bedroom count, and square footage. The goal is to find homes as similar to yours as possible.

Ask a real estate agent for MLS comps

Real estate agents have access to the Multiple Listing Service (MLS), a database with the most complete and accurate sales data available. The MLS often includes details that public websites miss, like seller concessions or how long a home sat on the market.

Many agents will run a comparative market analysis (CMA) for free, hoping to earn your business down the road when you're ready to navigate the various costs of selling. Even if you're not ready to sell, a CMA can be a useful reference.

Look up public property records

County assessor websites and tax records are free and publicly available. You can search by address to find the last recorded sale price and basic property details.

One thing to keep in mind: public records often lag behind actual sales by several weeks, and they may not capture adjustments like seller credits. They're useful for verification, but not always current.

Review recent sales in your neighborhood

Sometimes the best research happens offline. Pay attention to "sold" signs on your street and note which homes recently changed hands. If you can, drive by to see the exterior condition.

Neighbors often share sale prices informally, and that ground-level context can fill in gaps that data alone can't.

What makes a strong comparable property

Not every recently sold home qualifies as a good comp. A property that sold last month might still be a poor comparison if it differs too much from yours. Here's what separates a strong comp from a weak one:

Proximity to your home

Location drives value more than almost anything else. The closer a comp is to your property, the more likely it shares the same neighborhood characteristics: school district, walkability, noise levels, and overall appeal.

Aim for comps within the same subdivision or within a half-mile. In dense urban areas, even a few blocks can matter.

Recent sale date

Markets shift constantly. A home that sold 18 months ago might have traded under completely different conditions: different interest rates, different inventory, different buyer demand.

Focus on sales from the past three to six months. In fast-moving markets, prioritize the most recent transactions.

Similar square footage and lot size

Size directly affects value. Comparing a 1,200-square-foot home to a 2,400-square-foot home produces unreliable results. Aim for comps within 10–15% of your home's square footage.

Lot size matters too, especially in suburban and rural areas where outdoor space carries weight.

Matching property type

Single-family homes compare to single-family homes. Condos compare to condos. Townhouses compare to townhouses. Mixing property types introduces too many variables: HOA fees, shared walls, maintenance responsibilities.

Comparable bedroom and bathroom count

Bedroom and bathroom counts influence buyer demand. A four-bedroom home appeals to a different buyer pool than a two-bedroom, even if the square footage is similar.

When possible, match bedroom and bathroom counts exactly. If you can't, stay within one of each.

Similar age and construction style

Homes built in the same era typically share similar construction quality, floor plans, and maintenance needs. A 1960s ranch and a 2020 new build might have the same square footage, but they appeal to different buyers and carry different expectations.

Condition and upgrades at time of sale

A recently renovated home with a new kitchen will sell for more than a similar home that hasn't been updated in 30 years. When evaluating comps, try to assess condition at the time of sale.

Listing photos, property descriptions, and even Google Street View can help you gauge whether a comp was move-in ready or a fixer-upper.

Related: factors that drive home value.

Tips for finding accurate home comps in your area

Even with good data, the quality of your analysis depends on how carefully you select and evaluate properties.

1. Focus on sold homes rather than active listings

Active listings show asking prices. Sold prices show market value. Only sold comps give you reliable data.

Pending sales can hint at current activity, but until a sale closes, you won't know the final price or whether concessions were involved.

2. Stay within a half-mile radius when possible

Neighborhood factors like school quality, traffic, and proximity to amenities can vary over short distances. A home a mile away might be in a different school district or on a busier street.

3. Limit your search to the past three to six months

Market conditions evolve, and older sales may not reflect current buyer behavior. If you can't find enough recent comps, you might expand the time frame, but acknowledge that older sales carry less weight.

4. Adjust for differences in features and condition

No two homes are identical. When a comp has features your home lacks, or vice versa, you'll want to account for the difference.

For example, if a comp has a pool and your home doesn't, that comp's sale price likely includes a premium you wouldn't receive.

5. Use price per square foot to compare properties

Price per square foot — sale price divided by square footage — creates a useful equalizer when comparing homes of different sizes. If three comps sold for $180, $195, and $205 per square foot, you have a reasonable range to apply to your own home.

6. Consider current market conditions and seasonality

Buyer demand fluctuates throughout the year. Spring and early summer typically bring more buyers and higher prices, with home prices 16% higher in June compared to December through February, while winter months often see slower activity.

Who uses property comps and how

Different people use comps for different reasons. Knowing who relies on them and why can help you interpret the data more clearly.

Home sellers setting a list price

Sellers use comps to price competitively: high enough to maximize proceeds, low enough to attract serious buyers. 77% of agents identified overpricing as the number-one mistake homeowners make when selling. The goal is finding a price the market will validate.

Appraisers determining market value

Appraisers are required to use comps when providing valuations for lenders. Their job is to deliver an objective opinion of value that protects the lender's investment.

Homebuyers evaluating offers

Buyers use comps to determine whether a listing is fairly priced and to support their offer amount. If comps suggest a home is overpriced, a buyer might offer less or move on.

Real estate agents advising clients

Agents run comparative market analyses to guide pricing and offer decisions. A good CMA includes not just raw data but interpretation: why certain comps matter more than others.

Comps vs. appraisal vs. CMA vs. AVM: which one are you actually looking at?

Buyers and sellers often confuse four related but distinct outputs that all start from comps. Knowing which one you're looking at matters because each has different rules, different accuracy, and different uses.

• A comparative market analysis (CMA) is what a real-estate agent puts together to recommend a list price. It typically pulls 3 to 6 recent comps, makes informal adjustments, and lands on a recommended price range. Free, fast, and intent-aware — but not federally standardized.
• A licensed appraisal is a formal opinion of market value performed by a state-licensed appraiser, ordered by a lender to size a loan. It follows the Uniform Standards of Professional Appraisal Practice (USPAP), uses 3 to 6 comps with documented adjustments, and produces a single number. Federally standardized; typically $300 to $500 and takes 7 to 10 business days.
• An automated valuation model (AVM) is a statistical estimate generated by a computer from public records and recent sales. Public AVMs (like the free home value estimators on major real-estate portals) carry median error rates in the 2% to 7% range for on-market homes and higher error in low-data or unique markets. Fast and free; not a substitute for an appraisal.
• An iBuyer cash offer uses the same comp methodology plus a verified condition assessment to produce a real, binding-when-signed purchase price. Opendoor focuses on comparable sales transactions from the past few months and combines that with a human-reviewed home assessment.

A practical rule of thumb: use a free AVM for ballpark equity tracking, an agent CMA to set a list price, a licensed appraisal when a number has to hold up to a lender or court, and a cash offer when you want a fast, real number you could actually transact on.

How to calculate your home value using comps

You can estimate your home's value using comps and some basic math. While a professional appraisal offers more precision, this approach gives you a reasonable starting point.

1. Gather three to five comparable sales

Multiple comps provide a range and reduce the impact of any single outlier. If one home sold unusually high or low, having additional data points keeps your estimate grounded.

2. Identify differences between each property and yours

For each comp, note how it differs from your home. Does it have an extra bathroom? A smaller lot? A newer roof?

3. Adjust prices based on feature differences

If a comp has a feature your home lacks, subtract estimated value from that comp's sale price. If your home has something the comp doesn't, add value.

4. Determine a price range for your home

After adjusting each comp, you'll have a set of adjusted values. The range between the lowest and highest gives you a realistic price window.

For a data-backed starting point without the manual work, get a cash offer from Opendoor.

Related: how to calculate home value using comps and a real cash offer.

Common mistakes when analyzing real estate comparables

Even experienced homeowners make errors when evaluating comps. Avoiding a few common pitfalls leads to more accurate conclusions.

Relying on outdated or distant sales

A comp from two years ago or two miles away might seem relevant, but it likely reflects different market conditions or neighborhood characteristics.

Ignoring differences in property condition

Two homes with identical specs can sell for vastly different prices if one is move-in ready and the other needs work.

Using only one comparable

A single comp can be an outlier. Multiple comps provide a more accurate picture and help you spot anomalies.

Confusing list price with actual sale price

List prices are asking prices, not market values. A home listed at $400,000 might sell for $380,000 or $420,000. Always use final sale prices.

Why your comps and the AVM disagree (and what to trust)

It happens constantly: a homeowner pulls their own comps, gets a number, then checks a free AVM and sees a different number. Which one is right? Usually, neither is wrong — they're measuring slightly different things, and the gap tells you something useful.

Four common reasons your comps and an AVM disagree:

• AVMs see public records; you see the actual home. Public records often have a wrong bedroom count, an unrecorded addition, or a misclassified finish level. Your comp set can correct for what you actually see; the AVM can't.
• AVMs don't see condition. A home with a new roof, a remodeled kitchen, and refinished floors sells for meaningfully more than a comp with the original 1990s kitchen and a 22-year-old roof — but the AVM treats them as interchangeable. The Opendoor offer process is explicit that online estimates do not account for home condition or binding purchase commitment.
• AVMs blend a wider radius and timeframe. Most AVMs pull comps from a wider geography and longer time window than a careful manual comp set, which can drag the estimate toward neighborhood averages and away from your specific block.
• AVMs lag the market. Public AVMs typically refresh weekly or monthly. In a quickly rising or falling market, you're seeing where the market was by the time the number updates.

When the gap is small (under 3% to 5%), your comp-based number is probably defensible and the AVM is just smoothing. When the gap is wide (over 7% to 10%), one of you is missing something — usually the AVM, but occasionally a hot-or-cold local trend you haven't accounted for. The safest tiebreaker: a licensed appraisal or a real cash offer that bakes in condition.

Move forward with confidence in your home's value

Comps give you a clear view of what your home is worth based on real market data. Whether you're preparing to sell, curious about your equity, or evaluating a purchase, comparable sales provide the foundation for informed decisions.

Opendoor combines comparable sales data with local market expertise to deliver transparent, data-backed offers. Get a free cash offer and take the first step toward your next chapter.

Get an offer with a click of a button!

Sell your home directly to Opendoor, so you can skip all the hassle and months of uncertainty. Simply enter your address – and get our offer with a few simple steps.

Get your offer

Want a faster path to selling? Compare your options in SF Bay Area, Birmingham, and Milwaukee Waukesha with an instant Opendoor offer. Available across Georgia.

FAQs about real estate comps

How accurate are online home valuation tools compared to professional appraisals?

Online tools provide useful estimates but may not account for unique features, recent upgrades, or condition factors that a professional appraiser would evaluate in person.

What should I do if there are no comparable home sales in my neighborhood?

Consider expanding your search radius, extending the time frame, or consulting a local real estate professional who understands your area.

Can I challenge an appraisal if I disagree with the comps an appraiser used?

Yes. Homeowners can request a reconsideration of value by providing additional relevant comps the appraiser may have missed.

Do foreclosures and short sales count as valid comparable properties?

Distressed sales typically sell below market value and may not reflect what a typical buyer would pay under normal conditions.

How do comps work differently for condos compared to single-family homes?

Condo comps require matching unit type, floor level, and building amenities. Ideally, comparisons come from within the same complex.