Assessor’s Office

Assessor's Office

Property Value Appeals May 1 to June 1, 2017

Notices of Valuation were mailed on Monday, May 1

The Assessor’s Office completed its reappraisal of all property in Boulder County and mailed Notices of Valuation to property owners on May 1. For 2017, the actual value for residential, commercial, industrial, and other property types reflects the market value of the property as of June 30, 2016.

Note: These options require your Account Number and PIN.

More tools for filing a property value appeal

From the Assessor:

Business Personal Property

Senior Tax Exemption

The Colorado Constitution establishes a property tax exemption for qualifying senior citizens, surviving spouses of senior citizens who previously qualified, and for disabled veterans.


  • Qualifying seniors were born on or before January 1, 1952, and
  • Lived in the home continuously starting before January 1, 2007.
  • Owned the home continuously starting before January 1, 2007.

Effect on Taxes

  • The exemption goes into effect for tax year 2017.
  • The discount will first appear on the tax bill sent in January 2018.
  • The exemption remains in effect until a disqualifying event occurs:
    • properties held in trust, LLCs or other legal entities, or
    • surviving spouse, or
    • home destroyed by natural disaster

Deadline: Applications must be filed no later than July 15 to have the exemption apply to your tax bill the following year.

Property Information, Mapping, & Data

Online Property Search tool:

  • Works on most mobile devices.
  • Can be used with more web browsers.
  • Makes looking up property information easier.
  • Provides access to more property information.
  • Makes appealing property values online easier.

Property Search Help

Property Data Download

Records Policies

The Assessor’s Office policies reflect those of Boulder County, outlined in the Colorado Open Records Act (CORA).

Recent Sales

  • Recent Sales Activity—lists of sales for specified time frames. These lists are not intended to be used for real property assessment appeals.

Ask a Question about Your Property

Information Collection

The Assessor’s Office gathers and maintains information on properties, including:

  • Ownership
  • Location
  • Use
  • Sales
  • Building measurements
  • Construction type
  • Construction costs
  • Rental income, if applicable

Sources for this information are:

  • Real property deeds and declarations
  • Subdivision maps
  • Building permits
  • Local building contractors
  • Property owners
  • Declarations filed by owners of taxable personal property
  • Onsite inspections by staff

Learn more about:

Assessor Logo

Cynthia Braddock, Assessor
Cynthia Braddock
Meet the Assessor

Valuing Property

The Assessor’s Office establishes values every two years for more than 120,000 properties, worth nearly $50 billion in market value. The agency uses tools such as geographic information systems (GIS) and mass appraisal techniques to perform appraisal analysis.

The Assessor discovers and lists information about properties and uses this information to determine property values.

Property Assessment Overview

How Property Taxes Are Calculated

Contact Us


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

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

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



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