Mercer Island Tree Removal Permit & Ordinance Guide
King County, Washington
Protected Tree Definition
Significant tree: 6+ inches DBH for conifers, 8+ for deciduous. Exceptional trees at higher diameter.
Heritage / Landmark Trees
Exceptional trees designated under Mercer Island City Code 19.10 (Tree Code) at diameter thresholds higher than the significant-tree minimum, recognizing trees of exceptional size, species, or community value.
Permit Requirements
Tree permit required for removal of any regulated tree on private property.
Municipal Code
Mercer Island City Code 19.10 (Tree Code)
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Community Planning and Development
(206) 275-7605
Nearby Cities in King County
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Data last verified: April 2026. This information is provided as a reference. Always verify requirements directly with Mercer Island before submitting permits or reports.
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