September 8, 2026 · Real Estate, Explained · Blake Sherwood
What Is a Comparative Market Analysis? CMA vs. Appraisal, Explained
Facts last verified August 27, 2026.
A comparative market analysis, or CMA, is a report a licensed real estate agent prepares to estimate what a home is worth right now, based on what similar nearby homes have actually sold for. It is not a formal appraisal — it carries no regulatory weight with a lender — but it is the primary tool agents use to set a list price or evaluate an offer. Most agents provide a CMA at no charge as part of their listing or buyer-consultation services.
How It Works in Massachusetts
Massachusetts agents pull comparable sales — called “comps” — from MLS PIN (MLS Property Information Network), the regional multiple listing service covering the North Shore and most of the state. The agent identifies homes that sold recently (typically within the past three to six months), in the same town or immediate area, with similar square footage, bedroom and bathroom count, lot size, age, and condition. Each comp is then adjusted up or down to account for differences — a finished basement adds value, a busy road subtracts it.
The result is a price range, not a single number. A well-built CMA might conclude that a three-bedroom colonial in Beverly is worth between $620,000 and $645,000 based on four recent sales. The agent then layers in judgment about current market conditions — how many competing listings are active, how quickly homes are going under agreement, and whether the market is shifting — to recommend a specific list price within that range.
Massachusetts has no statute governing how an agent must structure a CMA. The Board of Registration of Real Estate Brokers and Salespersons, under the Division of Professional Licensure, licenses agents and sets conduct standards, but CMA methodology is professional practice, not a regulated formula.
What Is a CMA in Real Estate?
A CMA is a data-driven pricing report that a licensed real estate agent prepares to help sellers and buyers understand what a property is worth in the current market. It draws on recent sold data, active listings, and pending sales from the local MLS to produce a defensible price range for the subject property.
Sellers use a CMA to set a list price that attracts buyers without leaving money on the table. Buyers use a CMA to judge whether an asking price is reasonable before writing an offer — and to calibrate how much room, if any, exists to negotiate.
What Is the Difference Between a CMA and an Appraisal?
The core difference is who does it and why. A CMA is prepared by a real estate agent to guide pricing decisions; an appraisal is a formal valuation completed by a state-licensed appraiser, typically ordered by a mortgage lender to confirm the property is worth at least the loan amount.
| CMA | Appraisal | |
|---|---|---|
| Who prepares it | Licensed real estate agent | State-licensed or certified appraiser |
| Who orders it | Seller, buyer, or agent | Mortgage lender (usually) |
| Cost | Free in most cases | $500–$750 in Massachusetts |
| When it happens | Before listing or before making an offer | After a purchase agreement is signed |
| Purpose | Set or evaluate a price | Satisfy lender underwriting requirements |
| Legal standing | Agent’s professional opinion | Formal report under USPAP standards |
| Physical inspection | No interior visit required | Appraiser visits and inspects the property |
Massachusetts appraisers are licensed by the Board of Registration of Real Estate Appraisers and must follow the Uniform Standards of Professional Appraisal Practice (USPAP). A CMA reflects the agent’s market knowledge and MLS access — not a credentialed valuation under federal lending standards.
If a CMA and a later appraisal come in at different numbers, that is normal. If the appraisal falls below the agreed purchase price, the buyer and seller typically need to renegotiate or the buyer must make up the gap in cash.
How Do Agents Choose Comps?
Agents look for homes that sold within roughly three to six months, in the same neighborhood or a comparable one nearby, with similar size, style, age, and condition. The closer the match on all those dimensions, the less adjustment is needed and the more reliable the comp.
When good comps are scarce — which happens often on the North Shore — agents widen the search radius or look back further in time, then apply larger adjustments. A Marblehead antique cape and a new-construction colonial in the same town are not interchangeable comps, even if they share a zip code.
The most weight goes to closed sales, because those reflect what a real buyer actually paid. Active listings show what sellers are asking, not what buyers are paying. Pending sales are useful for reading current demand but their final prices are not yet public.
Why Online Estimates Often Miss on the North Shore
Tools like Zillow’s Zestimate are built on public records and algorithms. According to Zillow’s own published accuracy data, the nationwide median error rate for off-market homes is approximately 7 percent — meaning half of all estimates are more than 7 percent wrong. On a $700,000 North Shore home, that is nearly $49,000 in either direction.
The problem is worse here than in many markets. The North Shore’s housing stock is unusually varied: 18th-century antique colonials sit next to 1960s ranches, waterfront Victorians, and new-construction townhomes, sometimes on the same street. Algorithms need volume and uniformity to be accurate; they struggle with the one-of-a-kind, mixed-vintage inventory that defines towns like Marblehead, Salem, and Gloucester. A kitchen renovation completed last spring may not appear in any database an algorithm can read. An agent who walks through the house sees it; a model does not.
A Worked Example
Suppose you own a 1,800-square-foot, three-bedroom, two-bath colonial in Danvers, built in 1985, with an updated kitchen and a two-car garage. Your agent finds four recent sales:
- Comp A: 1,750 sq ft, same neighborhood, sold for $595,000 — no garage. Agent adds ~$15,000.
- Comp B: 1,900 sq ft, updated kitchen, sold for $630,000 — slightly larger. Agent subtracts ~$12,000.
- Comp C: 1,800 sq ft, original kitchen, sold for $578,000 — agent adds ~$20,000 for the kitchen update.
- Comp D: 1,850 sq ft, garage, sold for $618,000 — close match, minor adjustment down ~$5,000.
Adjusted values: $610,000 / $618,000 / $598,000 / $613,000. The agent recommends listing at $615,000, near the middle of the range, with a note that the market has been moving quickly and multiple offers are possible. No algorithm produced that analysis — it required local knowledge, MLS access, and professional judgment.
Coming Soon
Watch for our upcoming post, “How Much Is My Home Worth After 30+ Years? Understanding Your Equity Before You Downsize” — a deep dive into how long ownership, improvements, and market appreciation combine to shape your net proceeds.
Ready to See What Your Home Is Worth?
A CMA costs you nothing and carries no obligation. If you are curious about where your home stands in today’s market, reach out to Sherwood & Company. We cover Beverly, Salem, Danvers, Peabody, Marblehead, and the surrounding North Shore communities.
FAQ
How long does a CMA take to prepare?
A thorough CMA typically takes an agent one to three hours to research and compile, depending on how many good comps are available and how complex the property is. You usually receive it within a day or two of your initial conversation.
Is a CMA the same as a free online home value estimate?
No. Online estimates use public records and algorithms; a CMA uses live MLS data and an agent’s professional judgment about your specific home and neighborhood. On the North Shore, where housing stock is highly varied, the difference in accuracy can be significant — sometimes tens of thousands of dollars.
Do I need a CMA if I am buying, not selling?
Yes, a buyer’s CMA is just as useful. Before you write an offer, your agent can run comps on the home you want to buy so you know whether the asking price is in line with what similar homes have actually sold for.
Can a CMA replace an appraisal for my mortgage?
No. Lenders require a formal appraisal conducted by a state-licensed appraiser under USPAP standards. A CMA is a pricing tool, not a credentialed valuation, and no lender will accept it in place of an appraisal for underwriting purposes.
Last verified: 2026-08-27. Massachusetts appraisal licensing requirements sourced from the Board of Registration of Real Estate Appraisers (MA Division of Professional Licensure). Zestimate off-market error rate (~7%) sourced from Zillow’s published accuracy data. Massachusetts single-family appraisal cost range ($500–$750) based on published 2025–2026 Massachusetts market data (Houzeo, massrealestatenews.com). CMA methodology reflects standard MLS PIN practice on the North Shore.
