Assessor's Office

News & Information

Business Personal Property

• Business Personal Property Overview
• About Business Personal Property Declarations
• Business Personal Property value appeals are accepted as on-time June 15 through June 30 this year.
  Appeal your Business Personal Property valuation.

Real Property Value Appeals were accepted May 1 through June 1, 2021

The Assessor’s Office will mail Notices of Determination to property owners who file on-time appeals on or before August 15, 2021. Property owners will have until September 15, 2021 to appeal their determination to the Board of Equalization.

Ask a question about your Real Property

Assessor’s Office New Hours

The Assessor’s Office is one of several Boulder County departments participating in a pilot program to explore moving to a four-day work-week.

Starting January 4, the Assessor’s Office staff will be available Monday through Thursday, 7:30 a.m.–5:00 p.m. online and by phone, to take your questions or schedule appointments. Please call 720-574-1880, or email Assessor@BoulderCounty.org.

Assessor’s Office Status

All Assessor’s Office locations (the main location in Boulder as well as remote offices in Longmont and Lafayette) are closed to walk-in traffic until further notice.

Staff are available online and by phone during regular business hours to take your questions or schedule appointments. Please call 303-441-3530, or email Assessor@BoulderCounty.org.

Overview

The Assessor’s Office establishes values every two years for more than 120,000 properties within Boulder County, worth nearly $50 billion in market value, using tools such as geographic information systems (GIS) and mass appraisal techniques to perform the appraisal analysis. Property values are used to set tax amounts which the Treasurer’s Office administers and collects.

Connect With Us

• Assessor/Treasurer Change of Address form.
• View the Assessor A-Z guide.
• Schedule a meeting with Assessor staff.
• Ask a question about your Business Personal Property. Appeals are accepted June 15–30 each year.
• Ask a question about your Real Property. Appeals are accepted May 1–June 1 each year.
• Ask a question about your Senior Exemption. Applications must be filed by July 15.
• Search for your Notice of Value (NOV) online.
• 2020 Assessor’s Office State of the County video.