How to Challenge Your Property Tax Assessment in Whatcom County
(From Someone Who’s Been There — and Won!)

If you opened your property tax notice and felt your heart skip a beat, you’re not alone. Homeowners across Whatcom County, from Bellingham to Birch Bay, are seeing sharp increases in their assessed values.
Here’s the truth: the assessor’s office isn’t walking through your home. They don’t know that your kitchen hasn’t been updated since 1998, that the retaining wall’s leaning a bit, or that your neighborhood’s prices cooled after last year’s spike.
That’s why your friendly neighborhood REALTOR® (hi, that’s me) can help ensure your assessment reflects reality, not guesswork.
YES, YOU CAN APPEAL, AND SOMETIMES YOU SHOULD
A few years ago, I went through the appeal process myself after receiving an inflated valuation, and I won my appeal. It wasn’t intimidating, just detailed. I built a case using market data, home condition notes, and comparable sales.
Here’s what that experience taught me:
- The process is absolutely doable.
- You shouldn’t hesitate to question a valuation that feels off.
WHATCOM COUNTY APPEAL BASICS
Here’s what you need to know if you’re considering an appeal:
1. Check the Deadline
You have until
July 1 or 30 days after your Change-of-Value Notice (whichever is later). For 2025, the Whatcom County deadline is
October 27, 2025.
2. Gather Your Evidence
This is where I can help. Useful evidence includes:
- Comparable sales (I can pull these directly from MLS)
- Photos or repair estimates showing true condition
- A detailed market analysis that aligns with your home’s reality
3. File the Appeal
Submit your appeal form to the
Whatcom County Board of Equalization (BOE) along with your supporting documents.
4. Prepare for Your Hearing
I can help you organize your presentation so it’s clear, factual, and persuasive, whether you present it yourself or in writing.
WHY THIS MATTERS
Appealing isn’t about dodging taxes; it’s about fairness. When assessed values miss the mark, it’s worth taking the time to make sure you’re paying your fair share and not a penny more.
If you’d like help determining whether your assessment matches your market value, I offer a complimentary Property Value Review. Together, we’ll compare your county assessment with real Whatcom County market data so you can move forward confidently.
Because the county doesn’t know your home like you do, but I might.
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Andi Dyer, Managing Broker & REALTOR® | RE/MAX Whatcom County
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AndiDyer.com
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