Built for King County by local engineers. Our system scans regional sales and builds a complete appeal with the strongest comps, precise adjustments, and clear reasoning. We file within 2 business days of you signing, as long as your deadline is at least 2 business days away, and represent you through the entire hearing process. No upfront cost. You pay a flat $79 only if your valuation is lowered.
King County is mailing 2026 Official Property Value Notices area by area — enter your address to see if yours is live.
King County Appeal Statistics
“Approximately 25% of the property values appealed to the Board result in some type of reduction. Compelling market-based evidence is the key. … By law, the Assessor is presumed to be correct. The burden of proof is on you to show that the Assessor's determination is incorrect.”
— Official King County Board of Equalization Guidelines
We're built to clear the evidence bar most homeowners miss.
Official guidelines highlight that a lack of compelling, market-based evidence is the primary obstacle to securing a reduction. Appealo addresses this directly — sourcing local property records to calculate precise adjustments and generate narrative reasoning.
Enter your address to instantly calculate your potential tax savings. If the county hasn't published your 2026 valuation yet, drop your email—we'll notify you once it's published and your notice has been mailed.
Free Instant EvaluationSee your estimated savings instantly on screen. If your case looks strong, simply authorize us to file an appeal for you—there is absolutely no charge unless your property valuation is reduced.
No Upfront CostWe build your custom evidence package with the strongest comps and precise adjustments. We file it within 2 business days of you signing, as long as your deadline is at least 2 business days away, and handle your entire case all the way through the hearing.
$79 Flat Success FeeEvaluation
Free
✓ Official county assessment
✓ Indicated market value
✓ Estimated levy rate
✓ Estimated tax savings math
✓ Your potential annual savings
✓ Filing appeal deadline for your area
Evidence
Precision-Matched
✓ 3–5 best comparable sales
Why this range? →✓ Precision adjustment methodology
✓ Defensible narrative & reasoning
✓ Integrated property maps
Note: Evidence and filing inputs included in the appeal petition to the county are proprietary materials, fully managed by Appealo, and not shared.
Filing Speed
Within 2 Business Days
Clock starts the moment you authorize us to represent you, provided your deadline is at least 2 business days out.
Pricing Model
$0 upfront · $79 flat fee — only if your valuation is reduced.
Core Focus
King County Single Family House and Townhouse
Service Model
Fully Managed Service
Evaluation
Free
✗ Official county assessment
✗ Indicated market value
✗ Estimated levy rate
✗ Estimated tax savings math
✓ Your potential savings
✗ Filing appeal deadline for your area
Evidence
Not explicitly disclosed.
Filing Speed
Varies
Pricing Model
$0 Upfront · Takes 25–35% of your savings.
Core Focus
National / Multi-State
Service Model
Fully Managed Service
Evaluation
Self-Directed Evaluation
⚠ The Guesswork Trap: Gut feelings and automated home-value estimates aren't backed by verified county sales data.
Evidence
Self-Directed Structure
⚠ The Hallucination Trap: AI and real estate websites can hallucinate or include inaccurate info, giving the Assessor an easy reason to reject your case.
⚠ The Comp Volume Trap: Including excessive or weak comps gives the Assessor an easy target to discredit your appeal.
Filing Speed
Self-Directed Timeline
⚠ You track your area's appeal window, prepare documentation, and file manually.
Pricing Model
$0
Core Focus
Your Home Only
Service Model
Self-Managed
⚠ You build the appeal package
⚠ You handle the document filing
⚠ You represent yourself at the hearing
| Feature | Appealo | Ownwell | DIY (Do-It-Yourself) |
|---|---|---|---|
| Evaluation | Free ✓ Official county assessment ✓ Indicated market value ✓ Estimated levy rate ✓ Estimated tax savings math ✓ Your potential annual savings ✓ Filing appeal deadline for your area | Free ✗ Official county assessment ✗ Indicated market value ✗ Estimated levy rate ✗ Estimated tax savings math ✓ Your potential savings ✗ Filing appeal deadline for your area | Self-Directed Evaluation ⚠ The Guesswork Trap: Gut feelings and automated home-value estimates aren't backed by verified county sales data. |
| Evidence | Precision-Matched ✓ 3–5 best comparable sales Why this range? →✓ Precision adjustment methodology ✓ Defensible narrative & reasoning ✓ Integrated property maps Note: Evidence and filing inputs included in the appeal petition to the county are proprietary materials, fully managed by Appealo, and not shared. | Not explicitly disclosed. | Self-Directed Structure ⚠ The Hallucination Trap: AI and real estate websites can hallucinate or include inaccurate info, giving the Assessor an easy reason to reject your case. ⚠ The Comp Volume Trap: Including excessive or weak comps gives the Assessor an easy target to discredit your appeal. |
| Filing Speed | Within 2 Business Days Clock starts the moment you authorize us to represent you, provided your deadline is at least 2 business days out. | Varies | Self-Directed Timeline ⚠ You track your area's appeal window, prepare documentation, and file manually. |
| Pricing Model | $0 upfront $79 flat fee — only if your valuation is reduced. | $0 Upfront Takes 25–35% of your savings. | $0 |
| Core Focus | King County Single Family House and Townhouse | National / Multi-State | Your Home Only |
| Service Model | Fully Managed Service | Fully Managed Service | Self-Managed ⚠ You build the appeal package ⚠ You handle the document filing ⚠ You represent yourself at the hearing |
Before appealing, it's critical to understand King County's framework. By law, the Assessor is presumed correct by default—meaning you must meet two distinct requirements from the Board of Equalization to win a reduction:
1. Sourcing the Evidence
Historically, approximately 75% of property values appealed to the Board fail to secure a reduction, with guidelines highlighting that a lack of compelling, market-based evidence is the primary obstacle. Appealo satisfies this requirement by directly sourcing official King County public property records from your hyper-local neighborhood, ensuring all data and calculations are fully backed by verified local records.
2. Proving the Case
While providing a list of nearby home sales is only a preliminary step, Appealo satisfies the formal burden of proof by explicitly demonstrating how those sales prove your home is overvalued. The system handles this entirely by calculating precise mathematical adjustments for property differences and generating the structured narrative reasoning required by the Board.
| Strength | Why it matters |
|---|---|
| Local Precision | We integrate official King County public records to identify market nuances that national services miss, ensuring your valuation is rooted in verified, local reality. |
| High-Precision 3–5 Comps | We cross-reference official King County data points in your hyper-local area to isolate the 3–5 strongest comps. We adjust for property differences with narrative reasoning to explain the calculation, ensuring your evidence packet meets the requirements for a successful appeal.Why not include more comps? → |
| Transparent Flat-Success Fee | No commissions or hidden costs. You keep 100% of your savings; our one-time $79 success fee covers everything—from data analysis and package filing to complete hearing representation. You only pay if your assessed value is reduced. |
| Free Valuation Alerts | King County releases valuation records and mails notices on a rolling schedule. We watch your area and email you once your value, notice, and appeal window are all confirmed.Sign up now → |
Everything. The $79 flat fee covers our full-representation service — including comparable sales analysis, evidence preparation, formal appeal filing with the King County Board of Equalization, and hearing representation. There are no hidden fees, and you pay $0 unless your assessment is reduced.
Note: Evidence and filing inputs included in the appeal petition to the county are proprietary materials, fully managed by Appealo, and not shared.
When challenging the county, precision and strategic focus beat a volume data dump. More is not better; padding your appeal with too many comps dilutes your argument and gives assessors more opportunities to find flaws in your data.
Instead, Appealo mirrors the exact standards used by the county and appraisal professionals:
By isolating only the tightest cluster of high-match neighborhood sales, our algorithm builds a concise, bulletproof case where every comparable consistently supports a lower valuation.
Free evaluation. Honest answer. No charge unless your assessed value is reduced.
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