Seattle Property Tax Appeal
~750,000 residents. Highest absolute-dollar assessments in King County, with the widest spread between waterfront and inland comps.
How Seattle assessments work
Seattle's residential parcels span 27 ZIP codes and include nearly every property type in King County — view-fronted single-family homes in Madison Park, dense townhouses on Capitol Hill, and 1920s craftsman bungalows in Wallingford. Assessment area codes range from low-numbers (downtown / Capitol Hill / Queen Anne) to high-numbers (West Seattle / Rainier Valley), and the assessor's mass-appraisal model handles each area separately. That means a value-notice spike in Magnolia tells you nothing about whether your Beacon Hill home is over-assessed; each ZIP needs its own arms-length comp set.
Why Seattle homes are commonly over-assessed
Three Seattle-specific over-assessment patterns show up repeatedly in our data. First, Lake Union and Puget Sound view premiums applied uniformly along a block when only the front-row parcels actually have a clear sight line. Second, North Seattle ramblers (Maple Leaf, Greenwood, Pinehurst) where the assessor's grade-from-sketch underweights actual finish quality. Third, Capitol Hill / Central District townhouses where 4–6 units on one parcel get averaged with detached SFH comps — the comp set is wrong by construction.
Comp adjustments that matter most in Seattle
Comparable-sales analysis in Seattle has to handle two adjustments most other KC cities don't. View — the assessor codes Lake Washington / Puget Sound / Lake Union view ratings on a 0–4 scale, and a single rating step is worth $50k–$200k on a premium block. And lot — Seattle SFH lots range from 1,500 sqft (skinny new construction) to 9,000+ sqft (older Madrona / Mt Baker estates) within the same ZIP, so the $/sqft lot adjustment matters more here than in suburban cities with consistent lot sizes.
ZIP codes covered
This site automatically pulls comparable arms-length sales from within Seattle's ZIPs: 98101, 98102, 98103, 98104, 98105, 98107, 98109, 98112, 98115, 98116, 98117, 98118, 98119, 98121, 98122, 98125, 98126, 98133, 98134, 98136, 98144, 98146, 98155, 98168, 98177, 98178, 98199. You can also enter a parcel number (PIN) directly if you have your value notice handy.
Notable Seattle neighborhoods we've seen win appeals: Queen Anne, Capitol Hill, Madison Park, Madrona, Magnolia, Ballard, Wallingford, and West Seattle.
The Seattle appeal process at a glance
- Generate a free report — enter your Seattle address or PIN, we pull your assessment history, sales record, and 3–5 comparable arms-length sales from King County's public data.
- Decide whether to file — the report shows your supportable market value vs the assessor's value. If the gap is meaningful (typically >5%), an appeal is worth filing.
- Get your appeal packet by email — pre-filled BOE petition, valuation evidence, cover letter, hearing prep notes, and filing checklist as one print-ready PDF.
- Print, sign, mail — about 15 minutes total. Certified Mail with Return Receipt gives you legal proof of the postmark date.
Frequently asked questions (Seattle)
Is my Seattle ADU (accessory dwelling unit) counted in the assessed value?
Yes. The assessor adds permitted ADU square footage to the main building's improvements value. If your ADU isn't producing the income you'd expect — say it's used as a home office, not rented — that does not reduce the assessment. The standard for valuation is true and fair market value, not actual use.
I'm in a multi-unit Seattle townhouse — does that affect my appeal?
Each townhouse unit on a separately platted lot is its own parcel with its own value notice and its own appeal. The comp set must be other townhouse units (or condos with similar finish), not detached single-family homes nearby. This site automatically filters comps to your property class.
Does Seattle's new Property Tax Exemption (income-limited) interact with an appeal?
No. The Senior/Disabled exemption (RCW 84.36) freezes value at a base year but doesn't preclude appealing the current year's assessment. If you successfully appeal, both the assessed and exempt values adjust together.
What is the property tax appeal deadline for Seattle?
Seattle is in King County, so the deadline is July 1 of the assessment year, or 60 days after the value-notice mailing date — whichever is later. Postmark date governs (RCW 1.12.070).
Do I need a lawyer to appeal my Seattle property tax?
No. The King County Board of Equalization is designed for self-represented homeowners. The petition is a one-page form; the heavy lifting is the comparable-sales analysis attached as evidence. This site generates both for free.
How much can I save by appealing my Seattle property tax?
King County's effective property tax rate is around 1.0%, so a successful 10% reduction on a $1M home saves about $1,000 per year — and the lowered value becomes the baseline for future years until the next reassessment.
Ready to check your Seattle assessment?
30 seconds, no signup. We pull your data from King County, run the comparable-sales analysis, and tell you whether you have a case worth filing.
Get my free report →Other King County cities we cover
Bellevue · Kirkland · Redmond · Sammamish · Issaquah · Mercer Island · Renton · Kent · Federal Way