Development Services - Building & Planning
|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 7/1/2016, the 2015 edition of the Construction Codes shall be enforced by the City of Mercer Island. Click here for a list of significant changes to the current Codes
NOTE: Effective immediately, 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.
NOTE: Effective June 2017, new stormwater management regulations will be in place for private development projects. Click here for more information.
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
Low Impact Development (LID)
Frequently Asked Questions
Construction hours on Mercer Island are Monday-Friday: 7 am - 10 pm and Saturday, Sunday and legal holidays: 9 am - 10 pm. Please see MICC 8.24.020 for further information.