A comparative market analysis, or CMA, is an agent-prepared estimate of a home's market value based on recent sales of similar nearby properties. It gives sellers a defensible listing price, gives buyers a benchmark for an offer, and gives both sides leverage in negotiation. The rest of this guide breaks down what a CMA report actually contains and how agents build one.
TL;DR:
- A credible CMA prioritizes recent closed sales made in ordinary market conditions, usually at least three, and explains broader searches when comparable properties are scarce.
- Ask your agent for raw comparable sales, line by line adjustments, documented sources for market changes, and a reconciled value range rather than one figure.
- Use a CMA to set a listing price or shape an offer, but lenders require a formal appraisal for federally backed loans.
- A do it yourself estimate can start with three to five sales from the past six months, but professional adjustments are needed for confident pricing.
Table of Contents
- What's Inside a Typical CMA Report
- How Agents Build a CMA, Step by Step
- How Comps Are Chosen and Adjustments Calculated
- CMA vs. Appraisal vs. AVM: Which One Do You Need?
- How to Get a CMA, and Whether You Can Do It Yourself
- How to Spot a Weak CMA Before It Costs You
- OneSource Real Estate: Turning Comps Into Pricing Decisions
- Why Agent Judgment Still Matters Next to Automated Tools
- Price It Right and Let Us Handle the Rest
- FAQ
- Sources
What's Inside a Typical CMA Report
A CMA report is built around comparison, so it opens with a snapshot of your property: square footage, bedroom and bathroom count, lot size, condition, and photos that set the baseline for everything that follows. From there, the report shifts to the comparable properties themselves, pulling data on sold, pending, and active listings, though closed sales carry the most weight since they reflect what buyers actually paid.
A solid CMA includes:
- Sale dates, sale prices, and price per square foot for each comparable
- Line-by-line adjustments for differences in size, condition, and features
- A reconciled value range rather than a single rigid number
- Neighborhood trend notes, inventory levels, and sometimes a map showing comp locations
The National Association of REALTORS® consumer guide describes comps as recently sold similar properties used to estimate market value, with active and pending listings serving as supporting context rather than primary evidence. The reconciliation step matters most: it's where raw numbers turn into a usable price range you can actually act on.
How Agents Build a CMA, Step by Step
Agents don't just pull three recent sales and average them. A credible CMA follows a sequence designed to filter out noise and surface the comps that actually predict value.
- Define the market area and time window. Most agents start within a local radius and look at sales from recent months, widening only when inventory is thin.
- Screen for arms-length sales. Foreclosures, short sales, and sales between relatives get excluded because they don't reflect open-market behavior.
- Adjust for features, size, and condition. Each comp gets a dollar adjustment up or down based on what it has that the subject property doesn't, and vice versa.
- Apply time and market condition adjustments. A comp from five months ago in a rising market needs an upward adjustment to reflect today's pricing.
- Reconcile into a value range. Rather than landing on one number, the agent weighs the adjusted comps and produces a defensible range.
- Document sources and justify every adjustment. This step separates a professional CMA from a guess.
Pro Tip: Ask your agent to show the raw comp data before adjustments, not just the final number. That's where you'll see whether the math actually holds up.
How Comps Are Chosen and Adjustments Calculated
Not every nearby sale qualifies as a usable comp. A good comparable shares the same market area, similar physical and legal characteristics, and was sold as an arms-length transaction, meaning no distress sale, no related-party deal, and no unusual financing that skews the price. Fannie Mae's selling guide requires appraisers to document why chosen comparables best represent value and generally expects at least three closed comparables for a sales-comparison approach, a standard many agents borrow for CMAs even though they aren't bound by it.
Adjustments fall into a few categories:
- Time adjustments: supported by home price indexes, paired-sales analysis, or statistical trend rates rather than arbitrary percentages
- Location adjustments: school zones, busy streets, or flood zone designations that shift buyer demand
- Feature adjustments: square footage, bedroom and bathroom counts, lot size, garage space, and renovation condition
- Financing or concession adjustments: seller-paid closing costs or rate buydowns that inflate the recorded sale price
Time adjustments are often the single biggest source of divergence between a CMA and a later appraisal, which is why NAR's guidance on market adjustments recommends evidence-based methods over flat per-square-foot shortcuts. When true comps are scarce, agents expand the search radius but document exactly why the broader comps still represent the subject property fairly.
CMA vs. Appraisal vs. AVM: Which One Do You Need?
These three tools look similar on paper but serve different purposes, and mixing them up causes real problems in a transaction.
- CMA: a licensed agent's opinion of value, used for pricing and negotiation. Mass is explicit that a CMA is an unbiased estimate by a licensee, not a certified appraiser, and must be disclosed as such.
- Appraisal: a formal valuation by a licensed appraiser following USPAP standards, required by lenders for federally related mortgage transactions.
- AVM: an algorithm-generated estimate, fast and useful for a quick gut check, but lacking the line-item adjustment transparency a CMA or appraisal provides.
If you're setting a listing price or crafting an offer, lean on a CMA. If you're closing a federally backed loan, the lender requires an appraisal regardless of what your CMA says.
How to Get a CMA, and Whether You Can Do It Yourself
Getting a CMA usually starts with a conversation, not a form.
- Ask an agent directly. Most agents prepare a CMA free as part of pursuing your listing, so request one that shows raw comp data, adjustment rationale, and a value range rather than a single number.
- Expect no charge for a standard CMA, though a deeper paid consultation makes sense when you want strategy beyond a price range, such as timing the market or structuring a sale around investment goals.
- Try a DIY starter version if you just want a ballpark: pull public sale records, shortlist three to five comps sold in the last six months, note major differences in size and condition, then call a professional once you need adjustments you can't confidently calculate yourself.
A local pricing strategy breakdown shows how neighborhood-level tactics shift a CMA from a generic estimate into an actual pricing plan.
How to Spot a Weak CMA Before It Costs You
Not every CMA is built with the same rigor, and a sloppy one can cost you thousands at the negotiating table. The most common errors are stale comps pulled from sales that happened too long ago, concessions that got baked into a sale price without adjustment, and condition differences that never got accounted for.
Watch for these signs of a reliable CMA:
- Multiple comps, not just one or two cherry-picked sales
- Clear explanations for every adjustment, not just a final number
- Documented sources for time and location adjustments
- A reconciled range instead of a single suspiciously precise figure
Pro Tip: If an agent hands you a CMA with no adjustment notes, ask them to walk through one comp line by line. A confident agent can explain every dollar.
Fannie Mae's adjustment guidance notes that when a comp needs large adjustments, the preparer should explain the selection rationale rather than let the math stand alone. That same discipline separates a trustworthy CMA from one built on convenience.
OneSource Real Estate: Turning Comps Into Pricing Decisions
We treat a CMA as a starting point for strategy, not just a number on a page. When our Atlanta market data showed 4.7 months of supply, we used that signal to time a listing for multiple offers rather than a quick single-bid sale.
We've also helped sellers navigate the gap between a CMA and a lender's appraisal:
- Addressing $15,000 to $25,000 appraisal gaps in Georgia with fast reconsideration-of-value requests and contract adjustments
- Guiding investors to price rental units within 3 to 5 percent of comparable rents while factoring in concessions
These are the moments where comparative analysis stops being a document and starts being a decision.
Why Agent Judgment Still Matters Next to Automated Tools
A CMA works because it combines data with local context an algorithm can't see: a renovated kitchen two doors down, a school boundary shift, a buyer pool that's thinning out. Lean on an agent's CMA whenever real money is on the line, a listing price, an offer, or a negotiation, and save the quick AVM check for curiosity.
— Matt
Price It Right and Let Us Handle the Rest
A CMA only pays off when someone turns it into action, and that's where our team at OneSource Real Estate comes in. We build pricing strategy around the comps, not just the number they produce.
- Sell My Home: full pricing and listing strategy built from a current CMA
- Get a Cash Offer: a faster path when you want certainty over top-dollar bidding
- Monthly Management: ongoing property oversight with competitive pricing once you've bought or kept a rental, through our property management services
- 30-Minute Consulting Call: a session to pressure-test your pricing or investment strategy before you list; current prices are available on our website
If a condition issue is dragging your comps down, a one-day door or closet upgrade can close that gap fast. When you're ready to turn your CMA into a listing, reach out through our property management and sales page and we'll walk you through next steps.
FAQ
How do I get a comparative market analysis for my home?
Ask a licensed real estate agent to prepare one. Most agents provide a CMA free when you're considering listing with them, and a thorough one includes raw comp data, documented adjustments, and a reconciled value range rather than a single number.
How does a realtor do a CMA?
A realtor identifies arms-length comparable sales in your market area, adjusts each one for differences in size, condition, and features, then applies time-based adjustments before reconciling everything into a value range. The Fannie Mae comparable sales standard requires documented rationale for each adjustment, a discipline most agents borrow even outside formal appraisal work.
Do realtors charge for a CMA?
Most agents prepare a standard CMA at no charge as part of courting your listing business. A paid consulting session, like a 30-minute or 60-minute strategy call, makes sense when you want deeper investment or pricing guidance beyond the basic report.
Can I do my own comparative market analysis?
You can build a rough version using public sale records: shortlist three to five recent comparable sales, note major differences in size and condition, and avoid relying on a single comp. The Mass.gov CMA guidance notes that a proper CMA is an unbiased opinion built on consistent valuation techniques, which is hard to replicate without professional adjustment experience.