Shoreline Development

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Shoreline Substantial Development Permit

Planning to build within 200 feet of a water body? Is your property on Angle Lake? You may need a special permit to build!

A Shoreline Substantial Development Permit is required for development within 200 feet of the ordinary high water mark of a creek, lake, river or other water body. In SeaTac, construction of a single-family home is exempt from the Substantial Development Permit process, but be sure to double-check with Planning Department staff.

An application and SEPA checklist must be completed by the individual filing for a Shoreline Substantial Development Permit. Filing fees are based on the total cost of the proposed project. View the Shoreline Substantial Development Permit application packet [PDF].

Shoreline Exemptions

You may qualify for a Shoreline Exemption from the above permit if your project meets certain requirements, even if you are building within 200 feet of the ordinary high water mark of a shoreline.
Projects that meet exemption requirements may include construction of a single-family home, repairs to existing structures, private dock construction under $2500, and maintenance to irrigation or drainage systems. Double-check with Planning Department staff to see if your project qualifies for a Shoreline Exemption.

An application and SEPA checklist must be completed by the applicant filing for a Shoreline Exemption. View a Shoreline Exemption application packet [PDF].

For more information, call the Department of Planning & Community Development at 206.973.4750.

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