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9611 SE 36th Street
Mercer Island, WA 98040
Phone: 206.275.7605
Fax: 206.275.7726
Email: midsg@mercergov.or. . .

Open to the public:
8:30 AM - 5:00 PM
on Mon, Tue, Thu, & Fri

10:30 AM - 5:00 PM on Wed

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City of Mercer Island / Development Services - Building & Planning

Development Services - Building & Planning

Photo, Courtesy of the Historical Society
Photo, Courtesy of the Historical Society

The Development Services Group (DSG) on Mercer Island reviews all permits for land use and private development. It also manages capital improvement projects for the City. DSG is dedicated to helping the community achieve the vision of their future, their values and lifestyle. For the second year in a row, Seattle Magazine ranked Mercer Island as the number one suburban neighborhood out of the 50 Seattle-area suburban neighborhoods.

The Department is committed to preserving the unique island environment while encouraging sensitive and quality development. Work in the department is conducted by teams of employees organized by the product and service priorities of the City. These include Land Use/Planning, Building/Inspection, Utilities/Right of Way, and Permit Coordination.  See below to get the information you need! 

NOTE: Effective November 1, 2017, adopted changes to the residential development standards (approved by the City Council on 9/19/17) are in place.  View a summary of the changes adopted, view the full-text of the adopted code or view additional information (Development projects submitted before 11/1/17 will be vested under the old regulations).​

The City is planning a series of Information Sessions geared towards architects, builders, arborists and other building professionals.  These sessions will provide an overview of the new regulations, new process and impacts to projects, with plenty of time to answer questions.  The information sessions will have an informal, discussion-based format focused around the topics of interest to those in attendance. 

  • Residential Code Overview: Thursday, November 30, 2017, 4:00 pm in Council Chambers at Mercer Island City Hall​
  • Focus on Trees: Thursday, December 7, 4:00 pm in Council Chambers at Mercer Island City Hall​
  • Residential Code Overview: Tuesday, December 12, 2017, 4:00 pm in Council Chambers at Mercer Island City Hall

NOTE: Effective June 2017, new stormwater management regulations will be in place for private development projects.  Click here for more information.


NOTE: Effective January 1, 2016, all recyclable materials from construction and demolition (C & D) are required to be recycled at a King County Designated Facility. A list of designated facilities and details on the bans can be found on the King County C&D website.  Click here for a printable poster.


Development and Construction Permit Fee Schedule

Building Permits and Information

Land Use Permits and Information

City Property Information Search

Utilities (Water, Sewer, and Storm Water) and Right of Way/Encroachment Permits and Information

Fire Permits and Information

Tree Permits and Information

Electric Vehicle Charging Station Information

Municipal Codes


Green Building

Low Impact Development (LID)

Frequently Asked Questions

Contact Us

Hours of work are 7:00 a.m. to 7:00 p.m. Monday through Friday (except holidays) and 9:00 a.m. to 6:00 p.m. Saturday.  No work may be performed on Sunday and holidays.  Please see MICC 8.24.020 for further information.


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