Some county buildings are reopening to the public on June 1, while other services remain online. See current safer-at-home order with face coverings.

Resources are available for those impacted by COVID-19. For help, submit questions or call 720-776-0822 weekdays (9 a.m.-5 p.m.).

Level 1 Fire Restrictions remain in place for western Boulder County. View the flyer and map for more details. No fires, no shooting.

Using Time Trending for 2019/2020 Property Valuation

What Is Time Trending and How Is It Used?

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, 2016 to June 30, 2018 was used to determine values for the 2019 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, 2018 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 2019 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 2017 for $400,000. The files show the Time Trend Adjustment factor is 1.0117.

time trend adjustment 2019

Using the formula above:

time trend adjustment formulla

The adjusted sales price is $404,680.

Contact Us

Due to COVID-19, all Assessors Office sites are closed for business until Sunday, May 31. Please call or email us with your questions during our normal business hours.

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

Business Personal Property
Phone: 303-441-3316
Fax: 303-441-1783

Email

Schedule a meeting

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

Locations
Boulder
1325 Pearl St., 2nd floor
Boulder, CO 80302
Map & Directions
Hours: 8 a.m.-4:30 p.m. M-F

Longmont
515 Coffman Street, Suite 114
Map & Directions

Lafayette
1376 Miners Dr., Unit 105
Map & Directions