News and Information
2026 Property Value Appeals
If you have any questions about appeals, please contact the Board of Equalization.
Property owners who wish to contest their 2026 value may petition for abatement starting on the first working day of January within two years of the date the taxes were levied (Jan. 1).
Residential comparable sales for appeals
Need help? Instructions and assistance are available on our Residential Comparable Sales page.
Assessor Overview
Every two years, the Assessor’s Office reviews and sets the value of more than 120,000 properties in Boulder County. Together, these properties are worth more than $120 billion.
The office uses tools such as maps, property data, and mass appraisal methods to study property values. A property’s value helps determine its property taxes. The Treasurer’s Office sends tax bills and collects the payments.
Connect With Us
- Assessor/Treasurer Change of Address form.
- Ask a question about your Senior Exemption. Applications must be filed by July 15.
- Search for your Notice of Value (NOV) online.
