Tree Permits

The City Arborist reviews private development and tree removal applications with an eye for tree protection and retention per the requirements of the Mercer Island City Code. Public Works and Parks staff manage trees on public property.

NOTE: The City Arborist does not provide general tree consulting services. Residents that need a detailed assessment about the condition or quality of trees on private property should contact a certified Arborist. The International Society of Arboriculture offers a Find an Arborist Tool and other resources.

Do I need a tree permit?

The answer is almost always yes. The following may be allowed without a permit, but there are exceptions. Please see the FAQ (below) for more information.

Pruning a tree/ normal maintenance of a tree on your property
Cutting a small tree outside of a critical area/ buffer (see definition in the FAQ) on your property
Pruning tree limbs that reach over your property (up to the property line)
Removal of a species identified in the weed of concern, noxious, or invasive weed list established by Washington or King County

Please see below for more information on different tree permits.

Hazard or Emergency Tree Removal

A tree on private property may be cut without a tree permit in an emergency situation involving immediate danger to life or property. The City Arborist should be informed of the impending removal and a permit must be applied for within 14 days of the removal. The application shall include documentation of the imminent threat to life or property, ideally in the form of a report by a qualified arborist, but at least in the form of photographs that clearly depict the threat.

Street Tree Pruning & Removal

Trees and shrubs located in the City Right-of-Way are regulated by the City. When a resident wishes to trim or remove a tree in the City Right-of-Way, they must first obtain approval and a permit from the City. Public Works and Parks staff review these applications, the City Arborist generally is not involved with these inquiries.

Tree Permits on Private Property

Please read the information below to learn more about removing trees on private property that are not associated with a development (construction) project. Additional information on removing trees related to development can be found here.

Tree removal associated with a development proposal will be reviewed in conjunction with a development permit application.

Please see the forms and documents below for more information:

Tree Removal in Critical Areas

Tree removal that is not associated with a development project is not allowed in a critical area (wetlands, watercourses, landslide hazard areas and buffers). One or more of the following criteria must apply and documentation must be prepared by a qualified Arborist showing that:

Tree Protection During Construction How to Protect Trees During Construction Read More

Tree Resources

General Tree Care Tips, Selecting a Tree Service Company, and Other Resources.

Tree Permits

Do I need a tree permit?

Contact Information