In real estate, CMA stands for comparative market analysis, an informal estimate of a home’s current market value prepared by a licensed real estate agent or broker. Agents usually provide one at no cost, drawing on recent sales of similar nearby properties to suggest a realistic listing price or to help a buyer judge whether an asking price is in line with the market. It is a professional, data-backed starting point, not a formal valuation.
What’s Inside a CMA
A standard CMA organizes local market data into categories that together show what buyers are actually paying in your area right now. The backbone of the report is sold listings, which are homes that have closed in recent months. These carry more weight than any other data point because they reflect what real buyers spent real money on.
Active listings show the competition a seller would face: the homes currently on the market that a buyer could choose instead of yours. Pending listings, meaning properties under contract but not yet closed, signal where the market is heading in the short term. Most CMAs also include expired or withdrawn listings, and this is where the report gets interesting. These are homes that sat on the market without attracting a buyer at the listed price. The gap between what sellers hoped for and what the market absorbed often tells you more about realistic pricing than the successful sales do.
How Agents Pick Comparables and Build a Price
The accuracy of a CMA depends almost entirely on the quality of the comparables selected. Agents generally look for three to five properties that sold within the past three to six months and sit within roughly a one-mile radius of the subject home. In rural areas where transactions are sparse, that window and radius may stretch, but tighter parameters produce a more reliable result.
Property type has to match. A single-family home is compared to other detached houses, not condominiums, townhouses, or duplexes. From there, agents filter by square footage, bedroom and bathroom counts, lot size, age, and architectural style. The goal is to find homes a typical buyer would have considered as alternatives to yours.
Adjusting the Comps
Once the comparables are selected, the agent adjusts each comp’s sale price to account for differences between that property and yours. The adjustments always go on the comp, not the subject property, which is a detail that trips people up. If a comparable home has an extra bedroom your home lacks, the agent subtracts the estimated value of that bedroom from the comp’s sale price. If your home has a renovated kitchen the comp doesn’t, the agent adds value to the comp’s price. After all adjustments, the comp’s modified price reflects what it would have sold for if it were more like your home.
Adjustment amounts vary by market and feature. A storage shed or minor landscaping upgrade might warrant a small addition of a few thousand dollars, while an extra bedroom or finished basement could shift the number by $10,000 to $20,000 or more depending on the area. Experienced agents base these figures on local paired-sales data, comparing otherwise identical homes where one has the feature and the other doesn’t, rather than pulling numbers from a generic chart.
Accounting for Time
A comparable that sold six months ago didn’t sell in today’s market. If home values in your area have risen or fallen since the comp closed, the agent applies a time adjustment, a percentage reflecting the local rate of appreciation or depreciation. If a comp sold for $300,000 and local prices have increased roughly 4% since that sale, the time-adjusted price becomes $312,000. Skipping this step in a fast-moving market can throw the final recommendation off by tens of thousands of dollars.
The Final Number
After adjustments, the agent looks across all the comps for a consistent value pattern. If three adjusted comps cluster around $425,000 and one outlier lands at $390,000, the cluster carries more weight. The agent also factors in average days on market for the comps, a signal of how quickly your home might sell at a given price. The result is either a specific suggested listing price or a narrow range, presented alongside enough supporting data for you to understand how the number was derived.
What a CMA Is Used For
Most CMAs are prepared for one of three reasons. Sellers use them to set a listing price before putting a home on the market. Buyers use them to evaluate whether an asking price is reasonable before making an offer, or to decide how much to offer. Both situations lean on the same core question: what are similar homes in this area actually selling for?
A CMA can also serve as supporting evidence in a property tax appeal. Most jurisdictions allow property owners to present comparable sales data at the initial appeal level, and a CMA organized by a local agent packages that data in a format review boards are used to seeing. The weight it carries drops at higher appeal levels. If your case advances to a tax court or equivalent body, the other side may commission a full appraisal, and you’ll be at a disadvantage arguing from an informal estimate. For an initial challenge to an assessment that seems clearly inflated, a CMA is a low-cost starting point; if the dispute escalates, a formal appraisal strengthens your position considerably.
A CMA Is Not an Appraisal
This distinction matters more than most sellers realize. A CMA is an informal opinion prepared by a real estate agent. A formal appraisal is a legally recognized valuation performed by a state-licensed or certified appraiser under the Uniform Standards of Professional Appraisal Practice (USPAP). Lenders rely on appraisals, not CMAs, when deciding how much to lend on a property.
Federal banking regulations draw a hard line here. For residential real estate transactions above $400,000, federally regulated lenders must obtain an appraisal from a state-certified or licensed appraiser.1eCFR. 12 CFR 34.43 – Appraisals Required; Transactions Requiring a State Certified or Licensed Appraiser Below that threshold, lenders may accept a less formal evaluation, but even those follow regulatory guidelines a CMA does not meet. A CMA will never substitute for a lender-required appraisal regardless of how thoroughly it’s prepared.
The cost difference is significant. Agents almost always provide CMAs free of charge as part of their services when working with a potential client. A certified residential appraisal typically runs $350 to $550, though the price climbs for complex, rural, or high-value properties. Many states require agents to include a disclaimer on every CMA stating that the document is not an appraisal and should not be treated as equivalent to one. The NAR Code of Ethics reinforces this boundary; Article 11 requires agents to perform competently within their area of practice and to disclose any lack of experience when providing property opinions.2National Association of REALTORS. Case Interpretations Related to Article 11
A CMA Is Not a Zestimate Either
Free online tools like Zillow’s Zestimate and Redfin’s estimate use algorithms that crunch public records, tax data, and transaction history to produce a property value in seconds. They’re convenient, but the accuracy gap between these automated valuation models (AVMs) and a well-prepared CMA can be substantial.
Zillow reports that its Zestimate has a nationwide median error of 1.74% for homes currently listed on the market but 7.20% for off-market homes.3Zillow. What Is a Zestimate? That off-market number is the one that matters for most homeowners running a casual check on their home’s value, and a 7% error on a $400,000 home means the estimate could be off by nearly $30,000 in either direction. AVMs also assume average condition. They can’t see your new kitchen, your leaking roof, or the highway built behind your lot since the last sale.
A CMA’s advantage is the human judgment layer. An agent who has walked through the home and knows the neighborhood can adjust for a remodeled bathroom, an awkward floor plan, or the fact that the nearest comp backs up to a commercial lot. Those adjustments are invisible to an algorithm.
What a CMA Can’t Do
A CMA is only as good as the agent who prepares it and the data available at the time. In neighborhoods with few recent sales, finding true comparables becomes difficult, and the resulting estimate carries wider uncertainty. Markets that are shifting quickly can also outpace a CMA prepared even a few weeks earlier; the analysis reflects a snapshot, not a forecast.
Agent incentives are worth considering. A listing agent who wants your business may shade the price upward to win the listing, then suggest a reduction a month later. A buyer’s agent might nudge the estimate lower to make an offer seem more reasonable. Neither scenario is universal, but asking the agent to walk you through each adjustment and explain why specific comps were included or excluded is the best protection against a number that serves the agent’s interests more than yours.