Appraisal Fundamentals
The Sales Comparison Approach Explained
The method behind most residential opinions of value — and why the 'best' comparable isn't always the nearest one.
The Sales Comparison Approach values a property by analyzing what genuinely similar homes have recently sold for, then adjusting for the differences that remain. For most owner-occupied homes, it's the approach that carries the most weight — because active market transactions are the most direct evidence of what buyers are actually willing to pay.
Why Comparable Selection Is the Real Skill
Similarity Beats Proximity
The nearest recently-sold home isn't automatically the best comparable — a more similar sale a bit further away is often stronger evidence than a dissimilar sale next door.
Market Relevance Matters
Comparables need to reflect the same market segment and buyer pool as the subject property, not just a similar structure in a different price tier or neighborhood.
Adjustments Bridge the Gaps
Once truly comparable sales are chosen, each is adjusted up or down for remaining differences so it reflects what it would likely have sold for if it matched the subject exactly.
How Adjustments Fit In
No two homes are identical, so once relevant comparables are chosen, the appraiser adjusts each one's sale price for differences in size, condition, age, site, and sale terms — deriving those adjustment amounts from what the market actually shows buyers pay for each difference, not from renovation cost or guesswork. The result is a set of adjusted values that should cluster closely if the comparables and adjustments were sound.
What This Does Not Mean
It doesn't mean averaging a handful of nearby sale prices, and it doesn't mean the appraiser picks whichever comparables happen to support a desired outcome. Every comparable and every adjustment has to be independently supportable — which is also why a well-documented Sales Comparison Approach carries real weight in a property tax appeal or a lender reconsideration of value.
Frequently Asked Questions
Provided for general educational purposes based on USPAP and Fannie Mae Selling Guide standards for developing the Sales Comparison Approach. Last reviewed: August 2026.