Comparable-sale selection begins with the subject property. Before choosing sales, the appraiser considers the home’s location, site, design, age, condition, quality, living area, room count, amenities and overall market appeal. The goal is to identify sales that provide meaningful evidence of how the market responds to a property like the subject.
Similarity matters more than a rigid distance rule
A nearby sale may be in a different market segment because of school assignment, traffic influence, lot type, neighborhood character or construction quality. A sale farther away may be more useful if it offers a similar design, age, size and buyer profile.
The same principle applies to the date of sale. Recent sales are generally desirable because they reflect current conditions, but an older sale may be helpful when it is more similar to the subject. When market conditions have changed, the appraiser analyzes whether a time adjustment is supported.
Factors commonly considered
- Location and market area: neighborhood appeal, access, traffic, schools, views and external influences.
- Property type and design: one-story versus two-story, detached versus attached, traditional versus custom construction.
- Site characteristics: lot size, shape, usability, water influence, acreage and other site features.
- Age, condition and quality: effective age, renovations, maintenance and level of construction.
- Living area and room utility: total area, bedroom and bathroom count, layout and functional appeal.
- Amenities: garages, pools, outdoor improvements, accessory structures and other features buyers may recognize.
- Transaction terms: concessions, financing, non-market motivations and other circumstances that may affect the sale price.
Adjustments should reflect market reaction
When the subject and a comparable differ, the adjustment is intended to reflect how buyers in that market respond to the difference. It is not necessarily equal to construction cost, replacement cost or a fixed rule of thumb.
Adjustments are made to the comparable sales, not to the subject property. If a comparable has a feature the market recognizes as superior to the subject, its sale price is generally adjusted downward for that difference; if it is inferior, the adjustment is generally upward. The amount should reflect market reaction rather than a fixed cost or rule of thumb.
For example, the market contribution of a pool may vary by neighborhood, price range, age and condition. The same is true for living area, lot size, renovations and other features. Appraisers use market evidence to support the analysis whenever adequate data is available.
More comparable sales do not always produce a better analysis
A large group of weakly related sales can create more confusion than a smaller group of well-selected properties. The strongest appraisal explains why the chosen sales are relevant, addresses meaningful differences and reconciles the indications rather than averaging them mechanically.
Information from the listing side can still be useful
Real estate professionals may know about renovations, competing offers, unusual concessions, private sales or recent activity that is not obvious in public data. Providing factual property information and relevant market evidence can help the appraiser understand the assignment. The appraiser remains responsible for independently verifying and analyzing the information.