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Seattle Green Factor 
Greening Seattle's Neighborhood Business Districts

What is the Seattle Green Factor?
As of Jan. 20, 2007, permit applicants must meet a new landscaping requirement in Seattle’s commercial areas. Known as the Seattle Green Factor, this program requires new development in neighborhood business districts to meet a landscaping target using a menu of landscaping strategies. The Green Factor is designed to improve the extent and quality of landscapes, while allowing greater flexibility for developers and designers to meet open space requirements.
 
 How does it work?

The Green Factor encourages layering of vegetation in areas visible to the public and along streets adjacent to new development. Bonuses are provided for rainwater harvesting and choosing plants with low water requirements. Use of larger trees, tree preservation, green roofs and vegetated walls is encouraged. A worksheet (see sidebar link) helps applicants calculate their project’s score, allowing them to try different combinations of features to reach the requirement.  
 
New buildings complying with the Green Factor will contribute to a lush urban aesthetic, consistent with our reputation as the “Emerald City.” In addition to being attractive, new green elements in the landscape will improve air quality and help reduce energy consumption, cooling the city in the summer and insulating it in the winter. They will also reduce stormwater runoff, decreasing water pollution and public infrastructure costs.
 

Musée du quai Branly (Jessica Woolliams)

Planning Context
The Green Factor was developed as part of the City Council’s review of the Mayor’s Neighborhood Business District Strategy (NBDS). The NBDS proposal, which revises commercial zoning requirements for the first time in many years, is intended to advance the City’s growth management strategy as embodied in Seattle’s Comprehensive Plan.  It also responds to neighborhood plans for vibrant, pedestrian-oriented neighborhood centers. Council adopted the package on Dec. 11; the Mayor signed the legislation on Dec. 21.
More Info

Download the following documents for more on the Seattle Green Factor:

  • Background brochure
  • Green Factor Worksheet
  • Planting Area Calculation worksheet
  • Rainwater Harvesting Calculation Tool
  • Green Factor Street Trees
  • Ordinance 122311
  • Green Factor areas map
  • Draft Landscaping Director's Rule
  • Sample Landscape Management Plan

HELPFUL LINKS

  • Green Roofs website
  • Biotope Area Factor - Berlin Senate
  • Landscaping Resources for Professionals - Seattle Public Utilities

GREEN FACTOR WORKSHOPS
DPD sponsored a series of free workshops during spring 2007 to help applicants understand and apply the principles of the Seattle Green Factor.  View the news story and the slideshows from these presenations:

  • Green Factor—Learn Tips, Tricks & How-to
    Green Factor training presentation
  • Green Walls | Vertical Green
    Green Walls presentation (18MB)
  • Green Roofs & Plants for Green Roofs
    Green Roofs website
  • Rain Gardens & Permeable Paving Systems
    - SPU presentation
    - SvR presentation
  • Rainwater Harvesting
    Rainwater Harvesting presentation
  • Plant Selection for Healthy Landscapes
    Plant Selection presentation (11MB)
  • Putting it All Together: Cascading Benefits for Green Factor and Drainage Code Compliance
    Cascading Benefits presentation (11MB)
  • Landscape Management Plans as Required @ Seattle Central Library
    Landscape Management Plans (8MB)
  • Healthy Soils for Healthy Landscapes
    Soil Strategies for a Sustainable City (10MB)

CONTACTS
For more information about the Seattle Green Factor, please contact:

Dave LaClergue
(206) 733-9668

Janet Oslund
(206) 386-9738

Department of Planning and Development (DPD)
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