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Three Pillars Of A Good Comp
Same Economic Neighborhood and Market Segment
A reliable comp sits in the same economic neighborhood as the subject property. This typically means the same subdivision, school district, and buyer pool, not just “somewhere nearby.” National guidelines and NAR materials consistently define comps as similar properties that have recently sold in the same area, because buyers substitute between those homes when deciding what to pay. Crossing into a different school zone, price band, or community type (starter homes vs. luxury, urban vs. rural) changes the demand dynamics and breaks that substitution logic. The more you can say, “A buyer considering this home would also seriously consider that one,” the better the comp.
Closely Matched Physical Characteristics
Fannie Mae, Freddie Mac, and the Appraisal Foundation all emphasize that good comps share similar physical and legal characteristics: lot and site, living area, room count, property type (e.g., single-family vs. condo), style (ranch vs. two-story), age, and overall condition. The goal is to minimize how many adjustments you need to make for size, quality, and amenities. When the homes are naturally similar, any adjustments are smaller and easier to support with market data, which makes the value opinion more defensible and less dependent on judgment calls.
Recent, Arm’s-Length Sales That Need Limited Adjustment
Strong comps are recent, arm’s-length transactions that reflect today’s market, usually closed within the last 3–6 months in a typical market (longer in thin or rural markets). They should be normal, open-market sales between unrelated parties, not foreclosures, short sales, or deals with unusual concessions, unless those are explicitly adjusted and typical of the area. Guidance from Fannie Mae and the Appraisal Institute stresses that each sale must be analyzed for the circumstances of the transaction and adjusted only based on demonstrated market reaction. A good comp, in theory, is one that would require few, well-supported adjustments to mirror your home.
Three Pitfalls Of A Bad Comp
Choosing Homes Simply Because They’re Nearby
One of the biggest mistakes people make is assuming any home “close by” is a good comp. But location isn’t just distance—it’s school districts, community reputation, amenities, traffic patterns, and even which side of a major road you’re on. Two homes a few streets apart can be in completely different price brackets. If buyers wouldn’t realistically compare the two when shopping, it’s not a good comp, no matter how close it is.
Comparing to Homes That Aren’t Similar in Size or Upgrades
Many homeowners accidentally pick comps that “look similar” but differ in the details that actually drive value. A newly renovated home isn’t comparable to one that hasn’t been updated in 20 years. A 2,200 sq ft home with a pool isn’t comparable to a 1,600 sq ft home without one. Even layout matters: single-story vs. two-story, open concept vs. older segmented floor plans. When the homes are too different, the comparison gives a false impression of what the market will pay.
Using Old Sales Prices or Special-Case Transactions
People often pull comps that sold a year or two ago, or worse, when the market was moving at a completely different pace. Another common mistake is using sales that weren’t normal market transactions, such as foreclosures, flips, or family-to-family deals. These sales don’t reflect true buyer demand and can distort your estimated value by tens of thousands. Only recent, arm’s-length sales give a realistic picture of what your home is worth today.
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