Non-residential comparable sales data may also be found online.
How was the value of my home determined?
Real property assessment values properties by referencing time trended comparable properties that sold during the base period, using computer aided mass appraisal.
We use mass appraisal to estimate how property characteristics (like size, age, design, quality and condition, location, and land size) influence sale prices. We use a statistical analysis of populations sales of properties, not an individual on-site appraisal for each home.
We estimate the most likely sale price of your home as of the required appraisal date, June 30 of the prior even numbered year. For more detail, see our Property Valuation Process page.
When does the Assessor set the property value?
The Assessor revalues every property in odd-numbered years, and sends out a Notice of Valuation for every property on May 1 of the assessment year.
If the condition or classification of a property changes between the odd-numbered (assessment) year and the even-numbered (intervening) year, the Assessor sends out a new Notice of Valuation in May of the even-numbered year. If the condition and classification of the property remains the same, the tax notice sent by the Treasurer’s Office in January of the intervening year serves as that year’s Notice of Valuation.
Does the Assessor’s value reflect the current condition of my property?
The Assessor values the property based on the condition of the property on Jan. 1 of that tax year. The value is estimated as if the property had sold on the appraisal date, the last day of the two year base period, which is June 30 of the prior even numbered year.
So for example, for the tax year 2026, based on its condition on Jan. 1, 2026, we estimate what it would have sold for on June 30, 2024. If the condition and classification of the property have remained the same since Jan. 1, 2025, the value will remain the same as for the 2025 tax year.
Characteristics and condition information for your home comes from a variety of sources (building permits, subdivision plans, site visits, property owner reports, sales listings, and more). Assessor Office staff collects this information and collates it for inclusion in the record for your property.
If our data on your home’s characteristics/condition is incomplete or outdated, the value might not reflect the property’s true condition.
How do I correct my property description? (I believe there are errors in bedrooms, baths, square footage.)
There may be several reasons why our records don’t match your home’s current actual condition and characteristics. If our data on your home’s characteristics or condition are incomplete or outdated, your value might not reflect its true condition.
Check your Notice of Valuation (NOV) for accuracy. Verify the facts and characteristics (bed/bath count, square footage, finished basement, and so on). If something is wrong, that is valid grounds for appeal.
Appeal between May 1 and June 8 to request corrections to the property’s characteristics. Include photos or documents, if available.
Which characteristics are most important to the value of my home?
No one characteristic determines the value of a property. Characteristics that are considered include:
- size
- age
- condition
- location
- remodel
- quality
- lot size
- design style
- and more
All characteristics contribute to the value of a property.
Why did my value/tax bill increase? (I have not made any improvements.)
See value changes on Property Search.
How are my property taxes calculated?
There are three factors used when calculating property taxes. The property value, the assessment rate, and the mill levy.
Beginning in tax year 2025 (payable in 2026), there are two separate assessment rates for residential properties.
For a detailed description and an example calculation, see How Property Taxes Are Calculated
For more information, see also Understanding Property Taxes in Colorado
How do I correct the owner name or mailing address on the property record?
Changing owner names on title
How your name appears as the owner on title in our property record is dictated by deeds recorded with the Clerk and Recorders Office.
If a typo or other simple error needs to be corrected, you can contact our Office by mail, email or phone. If a name needs to be changed, added, or removed, a deed will need to be recorded to transfer title to the new name.
Correcting or updating your mailing address
Include in your request:
- The property’s account number and/or site address,
- The current mailing address, and
- The new, correct updated mailing address
When will I get an answer to my appeal?
A Notice of Determination will be mailed by the Assessor’s Office by Aug. 15—we cannot provide a status of appeal in advance of the mailing.
What if I disagree with my determination?
If you disagree with your determination, you have the right to appeal to the Board of Equalization (BOE).
The deadline to appeal the determination is Sept. 15.
Instructions for how to file to the County Board of Equalization will be included with your Notice of Determination.
