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Understanding Distance, Sale Date, Property Condition, and Why Zillow Comps Can Be Different
When homeowners try to determine the value of their property, they often start by examining recent sales in the neighborhood. Online platforms like Zillow, Realtor.com, or Redfin make it easy to view nearby transactions and estimate a value. A professional Long Island real estate appraiser selects comparable sales based on location, condition, size, and market behavior rather than relying on automated estimates.
Comparable sales, often called “comps,” form the basis of the sales comparison approach to value, which is the most common valuation method for residential real estate. Choosing the right comparable sales requires market knowledge, data verification, and adjustments that mirror actual buyer behavior.
For homeowners on Long Island, understanding how appraisers select comparable sales can help clarify why professional appraisals sometimes differ from online estimates.
Comparable sales are recently sold properties similar to the subject property in terms of location, size, condition, and overall features. These sales provide evidence of what buyers have recently paid for comparable homes in the same market.
The goal is to identify properties that a typical buyer would realistically view as alternatives when purchasing the subject property.
Because no two homes are exactly the same, appraisers consider several factors to identify the most reliable sales for comparison.
One of the initial factors appraisers evaluate when choosing comparable sales is how close they are to the subject property.
Real estate values can vary greatly from one neighborhood to another. Factors such as school districts, zoning, transportation access, proximity to water, and neighborhood appeal all impact market value.
For this reason, appraisers usually try to choose comparable sales that are as close to the subject property as possible.
In Long Island communities such as Massapequa, Wantagh, Seaford, Merrick, or Bellmore, values can differ between neighborhoods even within the same town. A home near the waterfront, for example, may sell for a much higher price than a similar home located further away inland.
In suburban areas, comparable sales are usually found within the same neighborhood or nearby. In rural areas or markets with fewer sales, appraisers might need to broaden the search area while evaluating how location differences affect value.
Market conditions constantly fluctuate. Interest rates, housing supply, and buyer demand all affect property values over time.
Therefore, the sale date is a key consideration when choosing comparable sales.
Appraisers usually focus on sales that closed within the last three to six months because these transactions most accurately reflect current market conditions. If recent sales are sparse, older transactions may be considered, but they may need adjustments to account for market shifts.
For example, if home values in a neighborhood have been increasing, a comparable sale from several months ago may need to be adjusted upward to reflect current pricing trends.
This type of market analysis guarantees that the appraisal shows current market value instead of outdated data.
Even homes on the same block can differ greatly in condition, upgrades, and appeal. Because of this, appraisers compare the property to similar sales and make adjustments when needed.
These adjustments show how buyers in the market usually respond to specific features.
Common factors that might need adjustments include:
• Living area square footage
• Renovated kitchens or bathrooms
• Overall property condition
• Lot size
• Garage or basement features
• Pools or outdoor amenities
• Quality of construction
For example, if a comparable sale has a recently renovated kitchen and the subject property does not, the appraiser might lower the comparable's value to reflect its better condition.
These adjustments enable appraisers to compare properties more precisely and estimate what the subject property would probably sell for in the current market.
The map above shows an example of a split-level home in Massapequa, along with several nearby split-level properties that have sold within the past year. When evaluating a property like this, an appraiser does not simply consider every sale in the area. Instead, the aim is to identify the sales that are most comparable to the subject property and best reflect how buyers would assess similar homes in the market.
Based on the nearby sales, the appraiser would narrow the options by focusing on properties that most closely match the subject home. These usually include factors such as:
• Overall condition rating and level of renovations
• Number of bathrooms and overall layout
• Lot size and site characteristics
• Gross living area (square footage)
• Key amenities such as central air conditioning or an in-ground pool
Once the most relevant comparable sales are identified, those properties are then included in the appraisal report. The appraiser compares each sale to the subject property and makes market-supported adjustments when needed. These adjustments account for differences in size, condition, amenities, or other features so that each comparable can be evaluated on a fair basis.
This process allows the appraiser to form a well-supported opinion of market value based on actual buyer behavior in the local market, rather than relying on automated estimates or broad averages.
Many homeowners notice that online estimates often produce values that differ from professional appraisals. One reason for this difference is the way automated systems select comparable sales.
Online platforms typically rely on automated valuation models (AVMs) that use algorithms and large databases to estimate value. While these systems can provide general estimates, they do not analyze properties with the same level of detail as a professional appraisal.
Automated systems may:
• Select sales from different neighborhoods
• Use properties that are not truly comparable
• Fail to adjust for renovations or condition differences
• Use outdated or incomplete public records
• Miscalculate square footage if additions or dormers are not reflected in public data
A professional appraiser confirms property features, assesses the home's condition, and adjusts the appraisal based on market data.
Selecting the right comparable sales is crucial because they directly influence the final opinion of value. Poorly chosen comparables can result in misleading conclusions about a property's worth.
Professional appraisers carefully analyze the market to identify the most relevant sales. This process includes reviewing MLS data, verifying property details, and studying buyer behavior in the local market.
For homeowners, attorneys, and real estate professionals, this detailed analysis offers a more dependable assessment of market value than automated estimates.
While online estimates can give a rough starting point, there are many situations where a professional appraisal offers a more accurate and defensible valuation.
This kind of analysis is especially useful in situations like:
• Pre-listing pricing decisions
• Estate or probate valuations
• Divorce-related appraisals
• Date of death valuations
• Private real estate transactions
Because these situations often need documented market support, a professional appraisal offers a thorough analysis that attorneys, courts, and financial professionals can trust.
Frequently Asked Questions
How many comparable sales are used in an appraisal?
Most residential appraisals usually include three to six comparable sales, although more sales may be examined if necessary to back up the valuation.
How recent must comparable sales be?
Appraisers usually prefer sales that closed within the last three to six months, although older sales might be considered if recent data is scarce.
Can listings or pending sales be used?
Active listings and pending sales are sometimes included to help illustrate current market conditions, but closed sales provide the strongest evidence of value.
Why might an appraisal differ from Zillow?
Zillow relies on automated valuation models that don't physically inspect properties or assess differences in condition. Appraisals include detailed market analysis and verified comparable sales.
Do appraisers only look within the same neighborhood?
Appraisers usually try to select sales from the same neighborhood whenever possible. However, if there are few sales, nearby areas may be considered with proper adjustments.
If you're planning to sell your home, settle an estate, or engage in a real estate transaction that requires an accurate understanding of market value, a professional appraisal can offer clarity and confidence.
Anthony Lucchi of DMA Appraisers has completed over 10,000 residential appraisals across Long Island, serving homeowners, attorneys, and real estate professionals throughout Nassau County, Suffolk County, and Queens.
For more details on pre-listing appraisals, estate valuations, divorce appraisals, or private home appraisals, contact DMA Appraisers to discuss your needs and schedule a professional appraisal.
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