Redmond, WA Landscaping Rules: Tree Removal & Heritage Trees (2026)

Redmond has one of the strongest tree protection ordinances in King County. RMC Chapter 21.72 regulates removal of significant trees on developed, developing, and undeveloped property. Significant trees are generally defined as deciduous trees 6 inches DBH (diameter at breast height) or larger and conifers 6 inches DBH or larger, with smaller thresholds for some species. A Tree Removal Permit is required before cutting any significant tree, and approved removals typically require replacement plantings at a mitigation ratio that depends on tree species and size. Hazard trees documented by a certified arborist may be removed after notice to the City. Trees inside Critical Areas (wetlands, streams, landslide hazard areas, fish and wildlife conservation areas including the Sammamish River and Bear Creek salmon habitat) are subject to RMC 21.64 and typically cannot be removed without a Critical Areas Report, mitigation plan, and extensive review. Removing trees without a permit can result in fines and required restoration plantings.