Sammamish, WA Tree Protection: Tree Removal Permits (2026)

Tree removal permits are central to Sammamish's tree-protection program, reflecting the city's heavily forested character. Under SDC 21.03.060, removing a significant tree (conifer 8 inches DBH or larger; deciduous 12 inches DBH or larger) requires a permit. The city screens applications for acceptance within two business days and, if accepted, reviews them within about five business days. Permits authorize removal up to the lot-size-based limits (e.g., 4 significant trees per year on a 1/4-to-1/2-acre lot, with a 10-year cap), and removed trees must be replaced per the code's ratios (one replacement per significant tree, two per heritage tree, three per landmark tree), using primarily native species. Trees in a street right-of-way are handled through a Type B Right-of-Way permit. Exemptions exist for trees below the significant thresholds (unless in a critical area), visibly dead trees (photo documentation required), and emergency removals of trees posing imminent danger; hazard trees require evaluation by a TRAQ-certified ISA arborist. Removing or damaging a tree without the required permit is enforced under SMC 23.100.010 at $1,500 per inch DBH, with mandatory replacement under SMC 23.100.015 (4, 6, or 8 trees depending on trunk size), and the city has characterized unlawful removal as subject to civil penalties including site restoration.