A nearby home sold for less than your county assessment. That may be worth understanding, but proximity and a low price alone do not make it useful evidence. The five signs sales are comparable help separate a genuinely relevant sale from a listing that merely looks persuasive at first glance.
For a Maricopa County homeowner reviewing a Notice of Valuation, the question is not whether another house sold cheaply. The question is whether that sale reflects a home sufficiently similar to yours, in the same local market, during a relevant period. Good comparison work is disciplined because the conclusion should come from public records, not our opinion.
Why one nearby sale is rarely enough
Residential neighborhoods contain meaningful differences, even when homes share a street or subdivision entrance. A two-story home may sit beside a single-level home. One property may have a pool, a larger lot, a substantially different floor plan, or a different use classification. A sale can be real, recorded, and close by while still being a poor measure of another home’s market context.
That is why a credible assessment check looks for a pattern, not a convenient outlier. It uses several sales that meet the same rules, then asks whether the resulting evidence supports a clear comparison. If the records do not provide enough qualifying sales, the honest result is insufficient data. We could widen the search until a preferred answer appears. We do not.
The five signs sales are comparable
1. The homes have the same property classification
The starting point is the county’s property record. Comparable sales should come from homes in the same broad property classification as the home being reviewed. This helps avoid mixing different kinds of residential properties simply because they happen to be nearby.
Classification is not a cosmetic detail. Homes that look similar from the road can be treated differently in public records because of their property type or recorded characteristics. A comparison that begins with mismatched classifications introduces uncertainty before price is even considered.
This does not mean every detail must match perfectly. No two homes are identical. It means the sales set should begin with properties that belong in the same basic category, rather than forcing unlike homes into the analysis.
2. Living area is within 15%
Square footage is one of the clearest ways a sale can become misleading. A 1,600-square-foot house and a 2,400-square-foot house may share a subdivision, construction era, and bedroom count, yet they serve different parts of the neighborhood market.
A practical comparison keeps living area close. LevyRight uses a 15% range, based on the living-area information in public records. For example, a home recorded at 2,000 square feet would be compared with homes roughly between 1,700 and 2,300 square feet. That range leaves room for normal variation without treating a noticeably larger or smaller home as interchangeable.
There are exceptions worth recognizing. A neighborhood with highly uniform homes may produce many close matches. A community with custom construction, large additions, or a mix of attached and detached homes may produce fewer. Fewer matches are not a reason to relax the rule. They are a fact about the available evidence.
3. The sales occurred within the prior 24 months
A sale price is tied to a moment in time. Market conditions, financing availability, new construction activity, and buyer demand can change. A sale from several years ago may describe what a home was worth then, not what the local market evidence showed during the relevant period.
Using a 24-month window keeps the comparison tied to recent recorded activity while allowing enough time to find a meaningful set of sales in areas where homes do not change hands often. It is a balance. A shorter window can be more current but may leave too little evidence. A longer window can add volume while making the result less relevant.
The sale date matters more than the date a home was listed. Listings are asking prices. Recorded sales show completed transactions, which is why they offer a firmer starting point for an evidence-based comparison.
4. The homes are in the same subdivision
“Nearby” is not always local enough. A main road, school boundary, community gate, development phase, or change in housing style can create different market behavior within a short drive. Crossing into the next subdivision may seem harmless, but it can combine homes that buyers and sellers do not view as direct alternatives.
Keeping sales within the homeowner’s subdivision is a deliberate constraint. It favors local relevance over a larger, looser set of results. In a tract community, this often means comparing homes built under similar conditions and subject to similar neighborhood expectations. In other areas, it may mean the available sales are limited.
That trade-off is intentional. A broad radius can make a report look more complete while quietly reducing its usefulness. More data is not automatically better data. The better question is whether the data describes the same neighborhood market.
5. There are at least five qualifying sales
One sale can be unusual. Two or three can still be shaped by individual circumstances that public records do not fully explain, such as a rapid sale, unusual condition, or timing that did not reflect the broader neighborhood. A minimum of five qualifying sales makes it less likely that a single transaction drives the conclusion.
Five is an evidence threshold, not a promise that every question is resolved. Even a group of five homes will have differences in condition, updates, lot placement, views, pools, and interior finishes. Public records do not capture every feature that can influence a buyer’s decision. But five properly screened sales provide a more dependable local reference point than a handpicked pair.
If fewer than five sales meet the classification, size, timing, and subdivision rules, the right response is to say so plainly. A thin data set cannot become strong merely because a homeowner wants a definite answer. Free, honest, even when the answer is no, is more useful than a conclusion built on weak matches.
What does not make a sale comparable
A low sale price by itself is not enough. Neither is a matching bedroom count, an online estimate, or a home located a few blocks away. These details can be useful context, but they do not replace a consistent screen for property type, living area, sale timing, and subdivision.
Condition is another limitation. County records can identify many structural facts, but they may not show a renovated kitchen, deferred maintenance, a premium lot, or an unusual interior layout. This is why a comparison should be read as a public-records analysis, not a claim that every property is identical or that a recorded sale explains every dollar of value.
It also matters how the results are framed. A sales set may indicate that an assessment is higher, in line, lower, or unsupported by sufficient comparable-sale data. The last category is not a failure of the analysis. It is the analysis showing its work and refusing to manufacture certainty.
How to read a comparable-sales result
Start with the count. If there are at least five qualifying sales, review whether they are all drawn from the same subdivision and fall inside the 24-month window. Then check the living-area range and classification. These rules should be visible enough that a homeowner can understand why each sale was included rather than simply receiving a number without context.
Next, look for consistency. When several qualifying sales cluster in a similar range, they offer stronger context than a scattered set dominated by one unusually high or low transaction. When results vary widely, the variation may reflect real differences that the public record cannot fully capture.
LevyRight applies these constraints before classifying the relationship between an assessment and local sales. The purpose is not to make every property look overassessed. It is to give homeowners a clear, account-free reading of the evidence that is available for their own neighborhood.
A careful comparison does not eliminate uncertainty. It makes the uncertainty visible, keeps the evidence close to home, and gives you a more grounded way to read the number on your notice.
