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The City of Portland, Oregon

Portland Trees

Call before you cut

phone: (503) 823-TREE (8733)


1900 SW 4th Avenue, Portland, OR 97201

Tree Plan Requirements

Tree plans must be included in a development permit application to show compliance with preservation, density, and planting requirements for projects that are subject to tree preservation and on-site tree density/tree planting requirements. Click here to see if tree preservation and planting requirements apply to your site.

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Tree Plan Requirements

Your tree plan must be drawn to scale and must contain the following information:

  • Existing improvements;
  • Any construction staging areas on site;
  • Proposed alterations including structures, impervious area, grading, and utilities;

Existing trees:

    • Existing trees on site – indicate location and diameter size
    • Existing trees in the street (adjacent to the development site) – location and diameter size
    • Proposed tree activity
    •  A narrative, if applicable, discussing alternative tree protection measures and/or exemptions (such as documentation showing that a tree is in poor health or is a nuisance tree
    • Any Heritage Trees and trees required to be preserved as part of a condition of land use approval
    • All trees completely or partially on the site that are at least 6 inches in diameter
    • Trees smaller than 6 inches in diameter when proposed to be retained for tree density credit

Street trees:

    • Any Heritage Trees and trees required to be preserved as part of a condition of land use approval
    • All trees that are at least 3 inches in diameter
    • Trees to be retained and proposed tree protection measures
    • Trees to be removed
    • Location, species, planting size, and number of trees proposed to be planted

Using a Development Impact Area

Development impact area is defined in Chapter 11.80.020 B 13 as:

The area on a site affected by proposed site improvements, including buildings, structures, parking and loading areas, landscaping, and paved or graveled areas. The development impact area also refers to areas devoted to storage of materials, or construction activities such as grading, filling, trenching, or other excavation necessary to install utilities or access.

Applicants may define a development impact area on sites larger than one acre or when development is occurring in the street and is not associated with an adjacent development site. Tree preservation requirements shall be based on trees within the development impact area and tree density will be based on meeting standards only within the development impact area. Trees may be planted to meet tree density requirements elsewhere on site (Chapter 11.50.030).

When using a development impact area on a site, applicants must also show:

On Sites:

  • Trees 6” DBH or larger within 25 feet of the development impact area or to the property line
  • Trees 3” DBH or larger in the adjacent right of way

In Streets:

  • Trees 3” DBH or larger within 15 feet of the development impact area
  • Trees 6” DBH or larger on properties within 15 feet of the development impact area

When an arborist report is required

An arborist report is required in the following situations:

  • If alternative tree protection measures are proposed
  • If a revision to an approved tree plan is proposed after construction activity has commenced
  • As part of a land division application

Changes to approved tree plans

Changes to approved Tree Plans that will not affect compliance with an approved land use review may be submitted for consideration as part of the development. If the project has commenced and alternative tree preservation is proposed, an arborist report must be submitted. The arborist report shall document that the alternative tree protection measures have preserved the health of the trees and the trees have not been injured by the development project. Changes to Tree Plans approved through a land use review are discussed here.

Emergency tree removal

Removal of trees that create a clear and present danger may occur prior to approval of a permit revision if a revised application is submitted within 7 days of the action. The revised application must include compelling documentation of why the emergency tree removal was necessary.


Trees indicated for preservation on the Tree Plan must be protected during development activities. View tree protection standards

Trees planted as part of the development permit requirements must be planted in accordance with the City's planting standards. View tree planting standards