Here is an example of how to estimate an all-inclusive condition/effective age adjustment:
Effective Age/Condition - Condition adjustments constitute the most significant adjustments in this appraisal. In determining the condition adjustment for each of the comparables, the appraiser estimates the effective age, economic life, and site value for the subject and each of the comparables. From this information, depreciation is extracted for the subject and comparables, a comparison is made, and when appropriate an adjustment is developed. The subject and Comparables #1 and #4 have an effective age of 12 years (actual age of 15 or 16 years adjusted downward for improvements made since the home was built), Comparable #2 has an estimated effective age of 5 years (actual age of 7 years), and Comparable #3 is a new built home with an effective age matching the actual age of 0 years. The total economic life of the homes is 60 years, and the value of the site is estimated at $30,000 for Comparables #2, #3, and #4, and $33,000 for the subject and Comparables #1 and #2. Based upon this analysis, the all-inclusive age and condition adjustment for Comparables #2 and #3 are estimated using the following formulas:
Comparable #2: (5-12)/60 x ($355,000-$30,000) = -$37,917
Comparable #3: (0-12)/60 x ($317,000-$30,000) = -$57,400