Updated: April 20, 2026
If you're planning tree removal in the City of Seattle, understanding the current tree code, permit requirements, and arborist documentation rules is essential before starting any work.
2026 Update: Seattle Tree Removal Permit Rules
Seattle’s tree removal rules continue to evolve, and in 2026, the city has placed even greater emphasis on
tree preservation, permitting, and professional oversight. Homeowners can no longer assume that trees can be removed freely—even on private property.
If you’re planning tree removal in Seattle, understanding the current rules is critical to avoiding delays, fines, or denied permits.
Tree Removal Is More Regulated Than Ever
Recent updates have tightened removal allowances across many property types.
- Larger trees are often
restricted unless tied to development or specific criteria
- Annual removal limits may apply depending on zoning and property type
- Some trees cannot be removed without
clear justification or replacement requirements
👉 This is one of the biggest shifts in Seattle’s tree code—and a common source of confusion for homeowners.
Tree Size, Tier & Classification Matter
Seattle regulates trees based on size, species, and significance.
- Trees are categorized into
Tier 1–Tier 4 classifications
- Larger and native trees receive
higher levels of protection
- Diameter at standard height (DBH/DSH) plays a key role in determining permit requirements
👉 A tree that seems “normal” may still be regulated depending on its size and classification.
Environmentally Critical Areas (ECAs) Add Complexity
If your property is located in or near an ECA, additional rules apply.
- Includes
steep slopes, wetlands, riparian zones, and shorelines
- Requires
additional review, protection measures, and mitigation planning
- Often increases both permitting requirements and project cost
👉 ECA sites are one of the biggest drivers of complexity in Seattle tree removal.
Arborist Reports Are Often Required
Many permits now require professional documentation before approval.
- Arborist reports to justify removal
- Tree risk assessments for hazard claims
- Site plans showing tree locations and impacts
- Compliance documentation for city review
👉 In many cases,
you can’t even apply for a permit without an arborist.
Registered Tree Service Provider (RTSP) Requirement
Seattle now requires that regulated tree work be performed by or under a
Registered Tree Service Provider (RTSP).
- Ensures compliance with
ANSI A300 and ISA standards
- Verifies proper licensing, insurance, and training
- Holds contractors accountable for permitted work
👉 Hiring a qualified, registered company is no longer optional—it’s part of compliance.
Bottom Line for Homeowners
Seattle’s 2026 tree code means:
- More trees require permits than in the past
- More projects require arborist involvement
- More coordination is needed before work begins
👉 The earlier you understand the rules, the smoother—and often cheaper—your project will be.