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Permitting services are available online via this website and For details, see our Customer Service Bulletin.


A plat alteration allows revisions to a legally recorded plat or short plat, including creation of new building lots provided everything is consistent with applicable zoning, conditions of preliminary plat approval, recorded covenants, and other binding regulations. Administered by DPER. See the legal authority Chapter 19A of the King County Code.

Refer to permit-application-forms-packet, Land Use - Subdivisions packet and Land Use - Short Subdivisions for detailed information.  If you have questions or would like to inquire about alternatives, please email

See the current fee schedule for an estimate.

How do I apply for a plat alteration?

See our Customer Service Bulletin for submittal information.

What is the timeline for processing a plat alteration?

Decision type 3: 120 days.

For more information

Call Permitting customer service at 206-296-6600 or email