San Luis Obispo County's website offers free plans for ADUs (which they call secondary dwellings). The site has a very simple layout that gives users quick and easy access to the plans and to assistance creating a secondary dwelling:
"In order to encourage property owners to build Secondary Dwellings, especially in
the urban areas, the Planning and Building Department sought to eliminate or
reduce some barriers to building Secondary Dwellings, such as architectural design
and engineering fees, permit fees, and the time it normally takes to process a
building permit by offering free building plans for Secondary Dwellings. The
Planning and Building Department worked with the local chapter of the American
Institute of Architects, the Workforce Housing Coalition and the Builders Exchange
to put on a design competition among local licensed architects, resulting in ten
winning home designs."
Olympia could definitely borrow from SLOs example, and we are beginning the process of organizing a design competition to hopefully provide the same access to plans.