This document discusses nonconforming uses and structures under the Shoreline Management Act. It provides definitions and background on nonconforming structures and uses. It outlines key points from the Washington Administrative Code and court cases regarding nonconforming uses. Examples are given from different counties' Shoreline Master Programs on how they regulate expansions or repairs of nonconforming structures. Considerations for addressing nonconforming structures and uses in local Shoreline Master Programs are also discussed.