Seattle has some of the strictest tree protection rules in the region. If you are a homeowner wondering whether you can take a tree down, here is an overview of how the city’s tree protection code works in practice.
Removal is generally limited without development
On private property where no development is proposed, removing protected trees is generally not allowed unless an exemption applies. The most common exemption is a tree that is hazardous, dead or dying, as documented by a qualified arborist. The city publishes guidance on hazard tree removal (SDCI Tip 242B), and trees in environmentally critical areas have additional rules.
Registered tree service providers and public notice
- Commercial tree work in Seattle must be done by a tree service provider on the city’s registry, and each registered provider must have an ISA Certified Arborist.
- Before removing a tree 6 inches in diameter or larger, the provider must post a public notice on site in advance (currently at least six full business days before removal), and reportable pruning also requires notice.
- Reportable work includes removing live branches 4 inches or larger in diameter and roots 2 inches or larger.
Building or remodeling?
If you are applying for a development permit, SDCI reviews the trees on the site. A project arborist identifies each tree’s tree protection area (starting at about one foot of radius per inch of trunk diameter), and the design must protect trees where required. Replacement planting or payment in lieu may be required for trees that are removed. An early arborist report can save redesign time later.
When to call an arborist
- You see decay, cracks, fungal conks, dead tops or a new lean.
- You need documentation that a tree is hazardous before removal.
- You are planning construction near trees.
- You want to know if pruning instead of removal can solve the problem.
Seattle’s code has been updated several times in recent years, so always confirm current requirements with SDCI before work begins.
Need help? ABC Herron Tree provides arborist reports, tree risk assessments and permit support in King and Snohomish County. Request a consultation or call 425-293-2443.