Comparative Market Analysis (CMA): What It Is and How It Is Prepared

A Comparative Market Analysis (CMA) is a structured evaluation of residential or commercial property value based on the recent sale prices of comparable properties in the same market area. Real estate licensees prepare CMAs to help sellers set listing prices and buyers assess offer reasonableness. Understanding how a CMA is assembled, what inputs it requires, and where its authority ends relative to a formal appraisal is essential for any party entering a property transaction.

Definition and Scope

A CMA is a written or digital report produced by a licensed real estate agent or broker that estimates a subject property's probable market value by analyzing the sale prices of recently sold, actively listed, and withdrawn comparable properties — commonly called "comps." The National Association of Realtors (NAR) distinguishes a CMA from a licensed appraisal: a CMA is a professional opinion of value generated by a real estate licensee, while an appraisal is a certified value opinion produced by a state-licensed or state-certified appraiser under the Uniform Standards of Professional Appraisal Practice (USPAP), administered by the Appraisal Foundation under federal mandate.

CMAs are used primarily in two contexts:

The scope of a CMA is explicitly local: the selected comparables must come from the same neighborhood, school district, or geographically defined submarket. A CMA for a property in Phoenix, Arizona will not draw comps from Scottsdale unless proximity, community character, and pricing patterns are demonstrably equivalent.

Regulatory framing for CMA preparation falls under individual state real estate licensing statutes. The Association of Real Estate License Law Officials (ARELLO) tracks state-level standards and notes that licensees in all 50 U.S. jurisdictions may prepare CMAs as part of their licensed activities, but may not represent a CMA as a certified appraisal.

How It Works

A CMA follows a structured, repeatable sequence. The numbered phases below reflect standard professional practice as documented by NAR's education resources and common state licensing curricula.

  1. Subject property documentation: The preparer records the physical characteristics of the subject property — square footage, lot size, bedroom and bathroom count, age, construction type, garage configuration, and condition rating. Any significant updates (roof, HVAC, kitchen renovation) are noted because they create upward adjustments.

  2. Comparable selection: The preparer queries the Multiple Listing Service (MLS) for properties that closed within the past 90 to 180 days, located within a defined radius (typically 0.5 to 1.0 miles in urban markets, expanding in rural markets). A minimum of 3 closed comparables is standard; 6 or more improves statistical reliability.

  3. Active and pending listings: Properties currently listed or under contract are included to represent competitive supply and buyer expectations, though only closed sales carry confirmed market price evidence.

  4. Gross Living Area (GLA) adjustment: Price-per-square-foot differentials between comps and the subject are calculated and applied. For example, if comparable homes average $185 per square foot and the subject measures 1,800 square feet, the adjusted baseline estimate is $333,000 before condition and feature adjustments.

  5. Feature-by-feature adjustment: Each comp is adjusted upward or downward relative to the subject for differences in bed/bath count, garage spaces, pool presence, view, and condition. These adjustments are typically drawn from paired-sale analysis within the local MLS dataset.

  6. Reconciliation: The preparer weighs the adjusted sale prices of all comparables, giving greatest weight to the most similar and most recent transactions, and arrives at a probable value range (e.g., $320,000–$345,000) with a point estimate or recommended list price.

The data underpinning step 2 flows directly from MLS compliance systems. MLS rules and compliance frameworks govern the accuracy and timeliness of records that CMAs depend upon.

Common Scenarios

Pre-listing pricing: A homeowner preparing to sell engages a listing agent who produces a CMA as part of the listing presentation. The CMA supports the agent's recommended list price, which then anchors negotiations. Seller disclosure forms and the CMA are typically reviewed together, since known material defects affect the likely sale price.

Buyer offer strategy: A buyer's agent prepares a CMA on a property before the buyer submits an offer. If the CMA shows the asking price is 8% above the median adjusted comparable value, the buyer has quantified leverage for negotiation.

Estate and divorce proceedings: Courts and attorneys may request CMAs as preliminary value indicators before commissioning a certified appraisal. Courts ultimately rely on USPAP-compliant appraisals for legal determinations, but CMAs provide rapid, cost-free (often no direct fee) orientation to market value ranges.

Relocation assistance: Corporate relocation programs frequently require a CMA as part of the initial property assessment. Relocation real estate services providers typically commission two or three independent CMAs and average the results.

Decision Boundaries

A CMA is not a legal document and carries no certified weight in mortgage underwriting, estate taxation, condemnation proceedings, or eminent domain cases. For those purposes, a USPAP-compliant appraisal from a state-certified appraiser is required. The real estate appraisal process governs that distinct workflow.

CMA vs. Broker Price Opinion (BPO): A BPO is a closely related tool used primarily by lenders and asset managers to value distressed or bank-owned properties. While methodologically similar to a CMA, a BPO is typically a paid service with a defined scope of work and is sometimes regulated separately under state law. ARELLO tracks BPO-specific statutes; as of its published regulatory summaries, over 20 states have enacted explicit BPO licensing or compensation provisions.

When MLS data is thin: In markets with fewer than 3 comparable closed sales within 180 days, a CMA's reliability degrades. Preparers in low-transaction markets may expand the search radius, extend the time window to 12 months, or adjust for market appreciation rates tracked by sources such as the Federal Housing Finance Agency's (FHFA) House Price Index.

Ethical limits: NAR's Code of Ethics (Article 11) requires that Realtors provide CMAs only within their competence area and disclose the basis for the value estimate. Misrepresenting a CMA as an appraisal constitutes an ethics violation subject to disciplinary review. Real estate disciplinary actions at the state level can include license suspension for such misrepresentation.

A CMA is a starting point for price discovery, not a final determination. Its accuracy depends directly on data quality, comparable availability, and the preparer's local market knowledge — variables that differ materially across property types and geographies.

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