After nine years as a real estate transaction coordinator, I have spent thousands of hours reading the "story" of homes. I’ve seen agent CMAs (Comparative Market Analyses) that look like masterpieces and others that look like they were written on the back of a cocktail napkin. More importantly, I’ve seen the gap between what an algorithm says a home is worth and what a buyer will actually write a check for.
If you are trying to figure out the value of your home, you have likely fallen into the "Price Per Square Foot" trap. You look at your neighbors, do some quick math, and assume that if a 2,000-square-foot house sold for $400,000, your 2,200-square-foot house must be worth $440,000. Stop. That logic is exactly how people end up with stale listings and price reductions. Let’s pull back the curtain on how square footage actually impacts your comps.
What is a CMA, and Why Does it Matter?
A Comparative Market Analysis (CMA) is not a precise valuation; it is a strategic roadmap. A good agent uses a CMA to establish a value range, not a single magic number. When I was reviewing files in the Albany and Capital Region, I looked for agents who provided a band of value—say, $385,000 to $410,000—based on active, pending, and sold listings within a specific radius.
The purpose of a CMA is to show you what buyers are actually paying for similar size homes in your exact micro-market. If you’re in a suburban enclave in Colonie, the value of an extra 200 square feet is going to look very different than it would in a historic row house in downtown Albany. If your agent isn't willing to "show me the comps" and explain the adjustments they’re making, they are just guessing.
CMA vs. The Algorithm (The Zestimate Trap)
I cannot stress this enough: Zestimates, Redfin Estimates, and other automated valuation models (AVMs) are not appraisals. They are statistical aggregators. They look at data points—bedrooms, bathrooms, and square footage—but they are blind to the "functional utility" of a house.
Here is why I get annoyed when sellers rely solely on these numbers:
- Lack of Walk-Through: An algorithm cannot tell if your basement is a damp, unfinished storage space or a high-end walkout living area. Market Nuance: In our local market, a 200-square-foot addition might add massive value if it creates an open-concept kitchen, but zero value if it just makes the hallway longer. The Lag: Online estimates often rely on data that is 30–60 days old. In a shifting interest rate environment, that data is ancient history.
CMA vs. Professional Appraisal
When you need a hard number for a bank, you get an appraisal. When you are deciding how to list your home, you get a CMA. They are not the same tool.
Feature Comparative Market Analysis (CMA) Professional Appraisal Cost Usually Free (provided by an agent) $400 – $750 Timing 24 – 48 hours 1 – 3 weeks Purpose Listing strategy and marketing Loan collateral and equity verification Rigidity Flexible range Single, defensible numberHow Comps Should Be Selected
If an agent presents a CMA to you, look at the selection criteria. If they are pulling houses from three towns over, walk away. To be accurate, comps must be:
Geographically Tight: Ideally within a 0.5 to 1-mile radius, or within the same school district/neighborhood. Recency: Sales within the last 3–6 months are your "North Star." Anything older than 6 months requires a market adjustment factor. Functional Similarity: If your house is a 1950s ranch, don't let them include a 2020 colonial in the comps just because the square footage is identical. The buyer profiles for those homes are completely different.The Square Footage Comp Adjustment: The Reality Check
This is where the math gets messy. There is a persistent myth that there is a "universal" price per square foot. There isn't. When I was reviewing appraisal notes, the "adjustment" for square footage was almost always lower than the average price per square foot of the home.
Why? Because the kitchen, the roof, how many comps in a CMA and the foundation already exist. Adding 200 square feet to a 2,000-square-foot house doesn't mean you add 10% to the total price. It adds "utility value."
What would make this number wrong?
When you look at a CMA, I want you to ask your agent: "What would make this number wrong?" If they can’t answer that, they haven't done the work. A number is usually wrong if:
- The "Effective" Square Footage is off: You have 2,500 square feet, but 500 of it is in an attic with low ceilings that doesn't count toward your Gross Living Area (GLA). Condition Mismatch: You’re being compared to a "flipped" home with quartz countertops and luxury vinyl plank, while your kitchen is original to the 1980s. Location Adjustments: The comp backs up to a highway, and your house backs up to a park. That is a significant value discrepancy that a simple square-footage calculation will ignore.
The "Price Per Square Foot" Reality
Let’s look at a hypothetical scenario in the Capital Region. You have a 1,800 sq. ft. home. Your neighbor’s 2,000 sq. ft. home just sold for $400,000 https://dlf-ne.org/how-recent-should-your-comps-be-a-deep-dive-into-pricing-your-home/ ($200/sq. ft.).
Most sellers think: "1,800 x $200 = $360,000."
However, an appraiser will look at the 200-square-foot difference and assign it an "adjustment value"—often somewhere between $50 and $100 per square foot—depending on the finishes and demand for that specific size in that neighborhood. So, the reality might look more like this:
- Base Value of 1,800 sq. ft. home: $350,000 Adjusted value of the 200 sq. ft. difference ($75/sq. ft. x 200): $15,000 Total Market Adjustment: $365,000
Notice that we didn't use the $200/sq. ft. average. If you price at $360,000 based on the "average," you’re leaving $5,000 on the table. If you price at $400,000, you’re pricing your home out of the buyer pool for your specific bracket.
Final Advice: Demand the Band
I spent nearly a decade watching agents fail because they gave their clients one number. They said, "Your house is worth $425,000." Then, the market shifted, or a comp came in low, and the transaction fell apart.
When you hire an agent to value your home, demand they show you the comps. Look at the range. Look at the adjustments they made for square footage, bedroom count, and condition. If they can’t explain *why* they chose those specific comps—or if they can’t answer the question, "What would make this number wrong?"—they aren't looking at your home; they’re looking at a spreadsheet.. Exactly.
Pricing is a conversation, not a calculation. Understand the comps, be realistic about your adjustments, and don't let a generic online algorithm dictate the equity you've worked so hard to build.