Market Analysis
How to Build a Comparative Market Analysis
A CMA prepared by a licensee is not an appraisal, and in most states a licensee may not represent it as one or charge for it as an appraisal opinion. What you may call it, what disclaimers must appear on it, and when an appraisal license is required instead are set by state law. Verify the rule in your jurisdiction before delivering a written opinion of value.
A comparative market analysis estimates what a property would likely sell for by examining what similar properties actually sold for and adjusting for the differences between them and the subject. The reasoning is the same sales comparison logic the exam tests, applied to a real address.
The procedure below is ordered so that each step depends only on work already verified. Most weak analyses fail early, at data verification or comparable selection, and no amount of careful adjustment afterward repairs that.
What a CMA Is, and What It Is Not
A CMA is an opinion of probable selling price derived from market evidence. It supports a pricing or offer decision and is prepared by a licensee in the course of brokerage services. It is grounded in the same principle of substitution an appraiser applies: a buyer will not pay more for a property than the cost of acquiring an equally desirable substitute.
An appraisal is a formal valuation developed by a licensed or certified appraiser under professional standards, with defined scope, intended use and reporting requirements. Lenders rely on appraisals for lending decisions. CMAs do not serve that function and are not interchangeable with them.
This distinction is regulated, not merely academic. States restrict when a licensee may provide an opinion of value, whether separate compensation may be charged for it, and what language must appear on the document. Some jurisdictions have specific terminology for a licensee's written opinion of value and specific disclaimers that must accompany it. Confirm yours and use the required form.
The Procedure, in Order
Each step is a gate. Do not proceed to adjustments on comparables you have not verified, and do not verify comparables you selected on poor criteria.
1. Verify the subject property
Assemble the physical and legal facts and confirm them against more than one source. Living area, lot dimensions, year built, room counts, parking, below-grade space, systems, and any recorded encumbrances or association obligations. Tax records and prior listing data are both commonly wrong about square footage and finished basements. Inspect the property yourself where possible, because condition and functional layout are the variables a data record cannot convey.
2. Define the competitive market area
Establish the boundary within which a buyer for this property would genuinely consider alternatives. That is usually a subdivision, a school attendance area, a shoreline or a corridor, not a radius. Physical and legal barriers matter: a highway, a jurisdictional line, or a different tax or association structure can separate two blocks that look identical on a map.
3. Select closed sales
Pull settled transactions within that area, as recent as the data allows, and as close to the subject in type, size, age, style and utility as the inventory supports. Favor fewer strong comparables over many weak ones. Exclude sales that were not arm's length, since transfers between related parties, distressed dispositions and portfolio sales do not reflect open-market behavior. Note any concessions, because a price reported without them overstates what the buyer actually paid.
4. Adjust toward the subject
Adjust the comparable, never the subject. Where the comparable is superior in a feature, subtract; where inferior, add. Derive the adjustment amount from your own market by comparing sales that differ mainly in that one feature, rather than importing a figure from elsewhere. Adjust only for differences a buyer in this market actually pays for, keep the number of adjustments small, and record the basis for each one.
5. Read the active and unsold inventory
Closed sales describe the past; current listings are the competition the subject would face. Review what is available now at similar utility, note how long it has been available and at what asking prices. Then look at withdrawn and expired listings, which mark asking prices the market declined. These bracket the range but should not be treated as evidence of value in the way settled sales are.
6. Reconcile to a range
Reconciliation is judgment, not arithmetic. Weight the comparables that required the fewest and smallest adjustments most heavily, rather than averaging the adjusted figures. State a range with a supported recommendation inside it, and write down the reasoning: the client should be able to see which sales drove the conclusion and why.
Selection Criteria That Keep a CMA Defensible
Comparable selection determines the quality of the result more than any other step. These are the tests worth applying to each candidate sale.
Arm's length. The buyer and seller were unrelated, both reasonably informed, neither under undue pressure, and the property had normal market exposure. A sale failing any of these describes something other than market value.
Recency relative to market movement. What counts as recent depends on how fast conditions are changing, not on a fixed window. In a moving market an older sale needs a market conditions adjustment derived from evidence; in a stable one it may need none.
Comparable utility, not just comparable numbers. Two properties with the same square footage can differ in functional utility through layout, access, ceiling height, or how the space is distributed. Buyers pay for usable space.
Consistent measurement. Compare living area measured the same way across all properties, and treat below-grade and unfinished space separately from above-grade living area rather than folding it into one total.
Same market segment. Price tier, property type and ownership form must match. A condominium with association obligations, a fee simple detached house and a property in a land lease arrangement are not substitutes for one another.
Net of concessions. Seller-paid closing costs, rate buydowns, repair credits and included personal property inflate a reported price. Adjust for them or the comparable misleads.
Verifiable. You should be able to support each fact about the comparable from the source it came from. An unverified detail that turns out wrong undermines the whole analysis in front of the client.
Common Errors and the Corrections
Adjusting in the wrong direction is the single most frequent mistake, and it is the one the exam tests repeatedly. The rule does not vary: the comparable is the thing being adjusted. If it has something the subject lacks, its price is reduced to estimate what it would have sold for without that feature. Stating that rule aloud before each adjustment prevents most errors.
Over-adjusting is the second. Every adjustment is an estimate, and stacking many of them compounds the error until the adjusted figure reflects your assumptions more than the market's behavior. A comparable that needs many large adjustments is telling you it is not comparable. Find a better one or say plainly in the report that the evidence is thin.
Using cost as a proxy for value is the third. Money spent on an improvement is not automatically recovered in price, and the recovery rate differs sharply by improvement type and by market. Derive what buyers paid for the feature from paired sales; do not substitute what it cost to install.
Working backward from a desired conclusion is the fourth and the most damaging. Selecting comparables that support a price already decided on produces a document that looks like analysis and is not. The discipline is to choose comparables on stated criteria first and accept the range they produce, including when it is unwelcome.
One more is worth naming: presenting a single number with no indication of uncertainty. Markets produce ranges. A precise figure implies a confidence the evidence rarely supports, and it is harder to defend later when the property does not transact at it.
Presenting the Analysis
The document has two jobs: support a decision, and show the reasoning well enough that the client can follow it.
Lead with the conclusion and the range, then show the evidence. Clients who have to hunt through pages of data for the recommendation tend to discount it. Include the comparables with their adjustments visible so the reasoning can be checked rather than taken on trust.
Say what the market is doing and how you know. Available inventory relative to demand, the direction of time on market, and whether properties are settling near or below asking prices are all observable from your multiple listing service data. Cite what you observed rather than characterizing conditions in general terms.
Be explicit about the limits. Note where comparable evidence was thin, which adjustments carry the most uncertainty, and what would change the conclusion. Stated uncertainty is more credible than false precision and is a better position to be in if the property sits.
Include the disclaimers your state requires, in the wording it requires, and do not describe the document as an appraisal or yourself as appraising. Keep the analysis and your compensation discussion separate, and keep a copy in the file, since a written opinion of value may fall under your brokerage's retention policy.
Questions About Comparative Market Analyses
How many comparables should a CMA use?
Enough to show a consistent pattern, which in most markets is a small number of genuinely similar settled sales. The count matters less than the quality: three sales needing minimal adjustment support a conclusion better than a long list assembled by loosening the criteria. When the inventory does not offer strong comparables, say so in the report instead of padding it.
What if the property is unusual and nothing is comparable?
Widen deliberately and in one dimension at a time. Extend the time window and adjust for market conditions, or extend the geographic area to a market with similar characteristics, rather than accepting a dissimilar property nearby. For genuinely singular properties, consider supporting the estimate with a second approach, such as land value plus depreciated replacement cost, and disclose the method and its limits. Where value is complex or the stakes are high, recommending an appraisal is the right advice.
How do I derive an adjustment for a single feature?
Use paired sales. Find transactions in the same market that are alike except for the feature in question; the difference in their prices estimates what buyers paid for it. Repeat across several pairs, because one pair can reflect something other than the feature. Where pairs do not exist, the adjustment is a judgment call and should be identified as one in the report.
Does a CMA determine the list price?
No. It establishes the supported range. The list price is the seller's decision, informed by the analysis and by their timing, their flexibility and the cost of being wrong in either direction. Your obligation is to present the evidence accurately and to say clearly when a chosen price sits outside what the market supports.
How does a CMA relate to what a lender's appraisal will find?
They examine the same market but serve different purposes and follow different standards. A contract price above what comparable evidence supports carries a real risk that the lender's valuation comes in lower, which is a conversation to have with the client before the offer rather than after. Raise it when the analysis shows it, in both listing and purchase situations.