Seattle has a comprehensive tree protection ordinance (SMC 25.11) that regulates removal of significant trees on both public and private property. Trees 6 inches or larger in diameter generally require a permit to remove. Exceptional trees receive the highest protection.
Seattle's tree protection regulations are found in SMC Chapter 25.11. The ordinance protects significant trees, defined as trees with a diameter of 6 inches or more at standard height (4.5 feet). Removal of significant trees requires a permit from SDCI. Exceptional trees — those meeting size thresholds specific to their species or that are rare specimens — receive the highest level of protection and generally cannot be removed. The city maintains a list of exceptional tree size thresholds by species. For development projects, tree retention and replanting requirements apply. Property owners must submit a tree plan showing existing trees and proposed removals. Street trees are managed by Seattle Department of Transportation (SDOT) and require SDOT permits for removal or pruning. The city requires replacement plantings for removed trees, typically at a ratio determined by the size of the removed tree. Seattle has a goal of 30% tree canopy coverage citywide.
Unauthorized removal of significant trees can result in fines of up to $11,500 per tree. Removal of exceptional trees without a permit can result in penalties of up to $36,000 per tree. Required replacement plantings and restoration may also be ordered.
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Side-by-side rule comparisons with other cities in King County.
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