Using Time Trending for 2021/2022 Property Valuation

What Is Time Trending and How Is It Used?

2021/2022 Comparable Sales

Time Trend Adjustments

By Colorado law, residential properties must be valued solely by the market approach using verified sales of similar homes. The study period of July 1, 2018 to June 30, 2020 was used to determine values for the 2021 reappraisal. The law also requires that all sales prices within the study period are time adjusted to reflect the actual market conditions on the June 30, 2020 appraisal date.

Calculating the Time Trend Adjusted Sales Price
Look up the Time Trend Adjustment for the specific Market Area and property type, month and year in which the property was sold using the 2021 Residential Time Trend information. Use this formula to calculate the adjusted price: original sales price X time trend adjustment = adjusted sales price.

time trend adjustment formula

Example
Take a home sold in Market Area 102 in February of 2019 for $400,000. The files show the Time Trend Adjustment factor is 1.0117.

time trend adjustment table 2021

Using the formula above:

time trend adjustment formula

The adjusted sales price is $404,680.

Contact Us

Assessor
Phone: 303-441-3530 option 1
Fax: 303-441-4996

Business Personal Property
Phone: 303-441-3530 option 2
Fax: 303-441-1783

Email

Schedule a meeting

Mailing Address
Main: PO Box 471
Boulder, CO 80306-0471

Locations

Assessor Boulder & Longmont Drop Boxes

Boulder
1325 Pearl St., 2nd floor
Boulder, CO 80302
Map & Directions
Hours: 7:30 a.m.–5 p.m. M–Th

Longmont
515 Coffman Street, Suite 114
Map & Directions

Lafayette
1376 Miners Dr., Unit 105
Map & Directions
Please note: the Lafayette office will be closed until October 26.