Renton, WA Landscaping Rules: Tree Trimming (2026)

Under Renton Municipal Code 4-4-130 (Tree Retention and Land Clearing Regulations), property owners can perform routine pruning and trimming of trees on private residential property without a permit, provided the pruning does not constitute topping (removal of the upper canopy in a way that endangers the tree) and does not exceed 25 percent of the live crown in a single year. Trees located within critical areas including wetlands, stream buffers along Cedar River and May Creek, steep slopes over 40 percent, and shoreline jurisdiction under RMC 4-3-090 require review by Community and Economic Development before any trimming beyond hazard removal. Street trees in the public right-of-way require a permit from Public Works — contact Renton Transportation Operations before pruning. On lots subject to a tree retention requirement from a recent subdivision or site plan, pruning of tagged retained trees may trigger review. Licensed arborists are recommended for large trees; ISA Certified Arborists can prepare hazard assessments that justify heavier pruning. Utility companies can trim trees in power line clearance zones under easement rights without owner permission.