Adjustments in the Sales Comparison Approach: How Appraisers Support Them

Elements of Comparison

Appraisers evaluate comparable sales across a consistent set of elements — property rights conveyed, financing terms, conditions of sale, market conditions at time of sale, location, and physical characteristics — adjusting for material differences between each comparable and the subject.

Paired Data Analysis

Where sufficient data exists, appraisers derive adjustment amounts through paired data analysis — comparing sales that are similar in every respect but one to isolate the value contribution of that single characteristic.

Qualitative vs. Quantitative Adjustments

When the data set is too thin to support dollar or percentage adjustments, appraisers may instead rank or bracket comparables qualitatively, reasoning to a value conclusion from relative positioning rather than precise mathematical adjustment.

Documenting the Support

An adjustment presented without underlying support — a round number applied because it 'feels right' — is one of the most common weaknesses reviewers and opposing experts identify in a report. Well-documented support is what separates a defensible sales comparison analysis from a superficial one.

Dunkin Advisors develops sales comparison adjustments grounded in market-extracted, documented support. Contact us to discuss your property's comparable data set.