Who decides my property value?

The county assessor where your property is located determines valuation; Westminster homeowners must check either Adams County or Jefferson County assessor records depending on parcel location.

How do I file an appeal?

Start with an informal review at the county assessor, then file a formal petition with the county board or board of assessment appeals by the county's published deadline.

What exemptions may apply?

Common exemptions include veteran or disability exemptions and specific local exemptions; check the county assessor page for available exemption types and application forms.

Westminster Property Valuation, Tax Appeals & Exemptions

Taxation and Finance Colorado 3 Minutes Read · published March 01, 2026

In Westminster, Colorado property valuation and tax relief involve county assessors, county treasurers, and formal appeal bodies. Westminster sits in both Adams and Jefferson counties, so homeowners should check the assessor record for their parcel and follow that county's appeal and exemption procedures. This guide explains who enforces valuation and tax rules, how to request an informal review, when to file a formal appeal, common exemptions, and practical action steps to preserve rights and deadlines.

How valuations and taxes are set

Property valuation for ad valorem taxes is performed by the county assessor where your property sits. The assessor establishes the assessed value used by taxing districts; taxes are collected by the county treasurer. Check your county assessor record early in the tax cycle so you can raise valuation concerns promptly.^[1]^[2]

Penalties & Enforcement

Enforcement and collection involve different county offices: the assessor establishes value, the treasurer collects taxes and enforces delinquencies, and county hearing boards resolve valuation appeals. Specific monetary fines or interest rates for late payment or enforcement actions are not specified on the cited assessor pages; see the county treasurer pages in "Help and Support / Resources" for collection penalty details and interest schedules. ^[1]^[2]

Monetary penalties: not specified on the cited assessor pages; consult the county treasurer for interest and late-payment charges.
Escalation: not specified on the cited assessor pages for valuation appeals; escalation for unpaid taxes generally follows treasurer collection and lien procedures.
Non-monetary sanctions: tax liens, administrative holds, and possible tax lien sale are possible under county treasurer rules (specific actions and timing: not specified on the cited assessor pages).
Enforcers and complaints: county assessor for valuation disputes, county treasurer for collection and delinquencies; official contact pages are in Resources below.
Appeals and time limits: appeals start with the county assessor's informal review, then a formal petition to the county board or board of assessment appeals; exact filing deadlines and hearing deadlines are stated on each county assessor's appeals page.^[1]^[2]

File early: many appeal rights are time-limited and missable.

Applications & Forms

Each county publishes forms and instructions for informal reviews and formal petitions. If a specific form number is not published on the assessor page, the assessor website provides the required petition or online filing method. Check your county assessor page for the exact form name and submission method.^[1]^[2]

Common violations and practical penalties

Failure to contest an incorrect assessment timely — risk losing appeal rights.
Delinquent tax payment — interest and collection actions by county treasurer.
Incomplete exemption application — denial or delay of exemption.

Keep copies of assessor notices and mailed correspondence as appeal evidence.

How to prepare an appeal

Gather evidence: recent sales, appraisals, photographs, and income/expense records for income properties.
Request an informal review with the county assessor early — instructions and forms are on the county assessor site.^[1]^[2]
If unresolved, file a formal petition to the county board or board of assessment appeals by the deadline stated on the assessor site.

FAQ

Who decides my property value?: The county assessor where your property is located determines valuation; Westminster homeowners must check either Adams County or Jefferson County assessor records depending on parcel location.
How do I file an appeal?: Start with an informal review at the county assessor, then file a formal petition with the county board or board of assessment appeals by the county's published deadline.
What exemptions may apply?: Common exemptions include veteran or disability exemptions and specific local exemptions; check the county assessor page for available exemption types and application forms.

How-To

Confirm which county (Adams or Jefferson) holds your parcel record and view the assessor record online.
Request an informal review via the assessor's published process; submit evidence supporting a lower value.
If informal review does not resolve the issue, file a formal petition with the county board or board of assessment appeals before the deadline on the assessor site.
If owed taxes are in dispute, follow assessor and treasurer guidance for appeals while ensuring timely payment or a protective payment to avoid collection actions.
Contact the appropriate county offices for confirmation of filings, hearing dates, and any required fees or forms.

Key Takeaways

Westminster properties fall under Adams or Jefferson county procedures depending on location.
Start with the county assessor's informal review and watch appeal deadlines closely.
Use official county forms and retain evidence; forms are available from the county assessor websites.