What makes a property comparable?
No single characteristic decides whether a comp belongs in a CMA. The strongest selections usually require the fewest explanations and the fewest large adjustments.
1. Begin with the same property type
Property type is the first filter because it shapes ownership, maintenance responsibilities, financing, insurance, amenities, and the buyer pool.
A detached single-family home should ordinarily be compared with other detached homes. Condominiums should be compared with condominiums, and townhomes with townhomes. Manufactured, mobile, and modular homes can be appropriate residential comps when the land is owned rather than leased.
Active and pending listings from another property type may sometimes provide broad competitive context, but mixing property types within the sold set can undermine the value conclusion.
2. Match the likely buyer market
Similarity is ultimately about buyer behavior. A golf-course home, waterfront property, 55-plus residence, equestrian property, acreage home, or pool home may attract a different audience from a nearby house without the same lifestyle.
Consider how buyers search and what they are trying to purchase. A three-acre property with fully usable high-and-dry land does not necessarily compete with a three-acre parcel where only a fraction is usable. The acreage field may look identical even though the real-world utility is not.
Community amenities, school boundaries, access, privacy, views, water frontage, and maintenance structures may also affect which buyers consider the property.
3. Compare living area without relying on it alone
Living area is important because it affects functionality, room scale, storage, construction cost, and buyer expectations. Begin with homes reasonably close to the subject's size, then review what that size represents.
A substantial square-footage difference can signal more than extra floor area. In some communities, larger models also include higher ceilings, larger closets, better materials, wider rooms, or more premium architectural details. A smaller home may therefore belong to a different quality category even when it is located nearby.
Price per square foot is a useful descriptive metric, but it should not be treated as a complete valuation model. It can conceal differences in land, condition, quality, amenities, and fixed-value improvements.
4. Evaluate quality, condition, and renovation level
Two properties with matching public-record facts can present very differently to a buyer. Review listing photos, descriptions, permits when appropriate, and any available information about renovations or deferred maintenance.
Look beyond labels such as “updated”
- Was the kitchen lightly refreshed or comprehensively remodeled?
- Are bathroom finishes basic, updated, or luxury quality?
- Does the flooring appear inexpensive, durable, premium, or inconsistent?
- Are improvements recent and cohesive, or dated and piecemeal?
- Do the roof, HVAC, windows, pool equipment, and other systems affect buyer confidence?
Marketing language is not a substitute for visual review. One agent's “luxury” may represent another agent's ordinary update.
5. Use location in context
Closer is generally preferable when the surrounding market is otherwise consistent. However, an arbitrary radius should not override property similarity.
In dense subdivisions, a nearby sale may provide excellent evidence. Rural homes, acreage properties, waterfront residences, and unusual luxury homes may require a broader search. The explanation should become stronger as the distance increases.
Review neighborhood boundaries, school zones, traffic patterns, access, municipal services, community amenities, lot position, and external influences. Two homes can be a short distance apart and participate in different markets.
6. Prefer recent sales—but do not worship recency
Recent sales help show current buyer behavior, so they deserve careful attention. But a recent sale of a materially different home is not automatically better than an older sale that closely matches the subject.
When using an older comp, verify that it remains reflective of the market and explain why it is meaningful. This may be reasonable when inventory is limited or the subject is rural, unusually large, highly customized, or part of a small specialty market.
7. Separate sold evidence from market competition
| Status | What it tells you | How to use it |
|---|---|---|
| Sold | A buyer and seller completed a transaction. | Use relevant solds to support the estimated value. |
| Active | The seller's current competition and asking price. | Use for positioning; review condition, size, reductions, and days on market. |
| Pending | The asking price attracted a buyer, but the contract price is usually unknown. | Use for current-market guidance, not as a closed-sale substitute. |
An overpriced active listing that has remained available for months should not be treated as proof of value. It may instead show a price the market has rejected. Likewise, a pending listing can be encouraging evidence of demand, but its final terms remain unknown until closing.
8. Watch for misleading feature descriptions
Listing data can overstate the practical value of a feature. “Water view,” for example, may describe anything from direct, unobstructed frontage to a distant glimpse visible only from one upstairs window.
Distinguish waterfront from water view and water access. Review photos, maps, lot placement, and the actual experience of living in the property. Apply the same skepticism to acreage, flex spaces, bonus rooms, remodeled claims, and other marketing-driven descriptions.
If the feature cannot be reliably verified, keep it informational and allow the agent to determine whether a manual adjustment is supported.
9. Know when to remove a comp
A comp should not remain in the set merely because it was included in the original search. Review the result after adjustments and investigate properties that pull the conclusion sharply away from the rest.
Reasons to reconsider a comparable
- It serves a materially different buyer market.
- Its property type or ownership structure differs from the subject.
- It requires several large or speculative adjustments.
- Its size difference reflects a different quality category.
- The sale involved unusual concessions or circumstances.
- The listing data contains errors or unsupported marketing claims.
- Another available comp is materially more similar.
Removal should be based on a defensible reason—not simply because the comp produces an inconvenient number. Document the reason so the analysis remains transparent.
10. Build a balanced final comp set
Use at least three credible sold properties. A larger set may help when the additional sales are genuinely relevant, but more data does not automatically mean better data.
The final set should collectively bracket the subject where possible: some properties may be slightly superior, others slightly inferior, and the strongest matches should help establish a defensible range.
After selecting the solds, add useful active and pending properties to test the proposed list price. Then verify every imported field, review the meaningful differences, and approve the analysis before relying on the conclusion.