Buildings and property

Describes how the trading of TDRs works in the private TDR market with link to the TDR Exchange.

The Transfer of Development Rights Exchange facilitates the trading of Transferable Development Rights. This page describes how it works and how to register on the Exchange.

How to use the TDR Property Map

These reports are a resource for property tax information across King County for a selected year.

City of Bellevue

Permitting building and fire inspectors inspect residential and commercial building projects that are under construction in unincorporated King County for compliance with King County Building Codes.

Learn more about King County programs to reduce greenhouse gas emissions and lower energy bills, while improving indoor air quality and climate resilience in homes and other buildings.

*Open to local governments in King, Kitsap, Pierce, and Snohomish Counties*

Code interpretation is a formal statement regarding the meaning or requirements of a particular provision in the King County Development Regulations. K.C.C.2.100

Learn more about how we assess and tax commercial property.

Find out how to access a lower-interest loan for projects that reduce greenhouse gas emissions, lower utility bills and save money on energy costs.

The Energize – Community Spaces program provides services and County-managed installations in community-facing buildings to improve energy efficiency, indoor air quality, and building occupant comfort, and to lower energy costs. This program is open to non-government owned community spaces located in King, Kitsap, Pierce, and Snohomish Counties. Program applications are open! Deadline to apply is April 20, 2026. The deadline has been extended to April 27, 2026 at midnight. Click, tap or enter to apply. Support for completing the program application is available on a limited basis. If your organization would like to request support filling out the application, please review the program information below and then complete the Application Support Request Form.

Learn how to apply for the Energize - Multifamily Homes Program.

Providing heat pumps and weatherization for homes and other buildings where covered in King, Kitsap, Pierce, and Snohomish Counties.

King County's Energize program helps eligible homeowners and renters access energy-efficient low- or no-cost heat pumps and other upgrades.

Maintaining Today, Building Tomorrow 

The Code Enforcement Section investigates complaints regarding violations of King County Codes (KCC) related to zoning, building, property maintenance, shorelines and critical areas in unincorporated King County as outlined in KCC Title 23.

Answers to the most frequently asked questions about county real estate sales, including tax title properties

Answers to frequently asked questions about property taxes in King County

Learn who is subject to gambling taxes, what activities are subject to gambling taxes, get information about where and how to send payments, and obtain the correct forms

Definition of TDR terminology.

King County is in the early planning stage for this subarea plan, which will focus on rural areas outside of cities and towns.

Learn about the process for applying to alter a historic property in unincorporated King County.

After King County issues a building permit, inspections are required at different stages of the project.

When you use MyBuildingPermit to schedule an inspection, you will search for your record, then select the inspection by name.  When you schedule inspections by phone (IVR) or text (SelecTEXT), you will enter your record number, and then the inspection code associated with the inspection you are scheduling.

City of Issaquah

Transfer of Development Rights

Overview of the King County TDR Bank.

If your project involves road or drainage site work, the information below outlines the applicant's expectations, responsibilities, and obligation to contact Permitting before initiating the work.

Information on current landslide and steep slope mapping, information, and resources. 

City of Normandy Park

Petition for Property Tax Refund Property owners may qualify for a refund due to a correction of a manifest error in description of the property relied on or used to estimate value for property assessment purposes. An example of a manifest error in description of a property could be the incorrect square footage of your house or lot. If you think you qualify, you may download the form here (.PDF) and return with documentation or evidence to support your claim. Refunds may be made for up to 6 years.  

Get information about paying property taxes, transferring ownership, or moving a mobile home in King County.

The North Highline Subarea Plan was adopted by the King County Council in December 2022.

Information about how to pay delinquent property taxes and set up payment plans

Instructions on how to research building and land use permits which have been finalized, closed or are still active in unincorporated King County can be found below. Code Enforcement case files may also be made available after they have been reviewed by staff for attorney/client privilege or confidentiality.   For records on property located within city limits, you must contact the city directly. Permitting Records Center does maintain some records for properties that are annexed or incorporated into a city after finalization of a King County permit. 

For franchised utilities

Permitting activities in unincorporated King County that may be of special interest to the public because of their nature, size, or location

Learn more about landslide mapping and property specific development conditions, or access reference maps for planning support. 

For information relating to your parcel or property such as confirming jurisdiction, finding zoning information, confirming setbacks, learning about potential critical areas such as wetlands, floodplains, or landslide hazards see our resources below.

Learn about the property tax foreclosure process and related property auctions in King County

Information about property taxes in King County, including ways to pay

Learn more about projects that require public notice, and how to research permitting records.

Public rules implement policies from legislation, like the King County Code (KCC). KCC chapter 2.98 gives county agencies general authority to promulgate rules. It also sets out the requirements we follow. Once they have been widely shared with time for comments, public rules have the force and effect of law.

Reference maps to help in planning purposes can be found on this page.

Learn more about regional planning and growth management. Find useful links on the topic.

Library of reports and dashboards released by the Harborview Construction and Infrastructure Division (HCID) and its predecessor Harborview Bond Project

Information and options for removing or modifying unlawful, discriminatory restrictive covenants.

City of Seattle

City of Sammamish

This committee reviews capital facilities plans submitted by local school districts to be sure they meet King County’s standards for enrollment projections, school capacity analysis, and impact fee calculations.

For information on the State Enviornmental Policy Act (SEPA) process within King County. 

City of Shoreline

Community Service Area subarea plans help guide development decisions in King County’s six rural Community Service Areas and five urban potential annexation areas. We get feedback from these communities using guidance from the Office of Equity, Racial and Social Justice.

Resources for developers, builders, architects, and homeowners interested to build toward a sustainable King County.

An interactive map showing TDR sending and receiving sites.

King County, Washington

Learn more about the adopted 2017 Vashon-Maury Island Subarea Plan