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How to apply to change/alter a landmark property

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

What is a Certificate of Appropriateness (CoA)?

Most renovation or rehabilitation projects on designated King County or City Landmarks will involve going through design review to obtain a CoA. The design review process was developed to help guide projects on local historic landmarks and protect them from demolition or destructive alteration. 

Design review should take place in the early stages of planning a project on a landmarked property, as specific actions may be required to protect significant historic features. Typically, a CoA must be obtained before a building permit can be issued. In some cases, projects that do not require a building permit may still require a CoA. 

Please note that the county or city permitting department will refer projects without CoAs back to the Landmarks Commission for review and approval. For smooth project planning and permit reviews, we recommend contacting the landmarks coordinator when first planning a project.

Landmarked properties are also eligible for preservation incentives, which can help offset the cost of some common rehabilitation or repair projects on historic structures, such as roofing, siding, or foundation work.

How to apply for a CoA

Applicants and property owners are strongly encouraged to speak with the King County landmarks coordinator before applying for a CoA.  

Design review/CoA process

Projects on properties designated as historic landmarks require an additional permit step before getting underway. Called a "Certificate of Appropriateness" (or CoA), these permists are issued following design review with King County historic preservation program staff and the city/county Landmarks Commission.

  • Contact staff

    Reach out to Sarah Steen, the King County Landmarks Coordinator, to discuss your project and determine if a CoA is required.

  • Submit project materials

    If a CoA is required, staff will provide you with a CoA application and instructions. Submit your plans, photos, elevations, material samples and a description of the proposed project.

  • Schedule review meetings

    Design review involves two meetings - one with the Design Review Committee (DRC) on the second Thursday of the month (virtual), and one with the King County Landmarks Commission (KCLC) on the fourth Thursday of the month (virtual/in-person).

  • Meet with DRC and KCLC

    If possible, attend both meetings to answer questions and describe your project. The DRC and HPP staff will make recommendations to the Landmarks Commission, who will then make a final decision on your project application.

  • Begin project

    If approved, you may proceed with the project (after obtaining any other required building permits).

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